HomeMy WebLinkAboutRPT000201 KEA - VRB Feasibility Study Rev A Updated
REPORT
RPT000201
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Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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Created by: S. Gramm Date: 2008-11-05
Approved by: Date:
Approved by: Date:
THIS DOCUMENT, SUBMITTED IN CONFIDENCE, CONTAINS PROPRIETARY INFORMATION WHICH SHALL NOT BE REPRODUCED
OR TRANSFERRED TO OTHER DOCUMENTS OR DISCLOSED TO OTHERS OR USED FOR MANUFACTURING OR ANY OTHER
PURPOSE WITHOUT PRIOR WRITTEN PERMISSION OF VRB POWER SYSTEMS.
Revision Record
Rev CO Description Revised by Date
AA Draft Scott Gramm 5 Nov 2008
REPORT
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TITLE: Feasibility Study, Kotzebue Electric Association
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Contents
Contents ................................................................................................................................................ 2
1.0 Executive Summary ................................................................................................................... 4
2.0 Terms and Acronyms ................................................................................................................. 5
3.0 Introduction ................................................................................................................................ 5
3.1 Customer Need/Background .................................................................................................. 6
3.1.1 Current System ............................................................................................................... 6
3.1.2 Planned Expansion .......................................................................................................... 7
3.1.3 Constraints/unique challenges ........................................................................................ 7
3.2 VRB as a solution ................................................................................................................... 8
3.2.1 VRB vs. Batteries ........................................................................................................... 8
3.2.2 Load – Leveling .............................................................................................................. 8
3.2.3 Wind Variability ............................................................................................................. 8
4.0 Project/Report Scope ................................................................................................................. 9
5.0 Proposed Solution ...................................................................................................................... 9
5.1 Economic Case ..................................................................................................................... 10
5.1.1 Add VRB to Current System ........................................................................................ 11
5.1.2 Add VRB to future System ........................................................................................... 11
5.2 Battery Design ...................................................................................................................... 13
5.2.1 Electrical ....................................................................................................................... 14
5.2.2 Mechanical Systems ..................................................................................................... 14
5.3 Battery Control ..................................................................................................................... 15
5.4 Functional Modes of Operation............................................................................................ 16
5.4.1 Energy Supply / Demand Leveling ............................................................................... 16
5.4.2 Time Shifting ................................................................................................................ 17
5.4.3 Power Quality Control .................................................................................................. 18
5.5 System Functions ................................................................................................................. 19
5.5.1 Initial Charge ................................................................................................................ 19
5.5.2 Charge and Discharge ................................................................................................... 19
5.5.3 Power Factor Control .................................................................................................... 19
5.5.4 Grid Voltage and Frequency Stabilization .................................................................... 19
5.5.5 Control and Monitoring ................................................................................................ 19
5.5.6 Fault Monitoring and Recovery .................................................................................... 20
6.0 System Architecture And Control Scheme .............................................................................. 20
6.1 Controller Devices Layout ................................................................................................... 20
6.2 Control Architecture ............................................................................................................. 21
6.3 Existing Control System ...................................................................................................... 22
6.4 Application Interface Layer ................................................................................................. 23
6.5 Two Mode Control Scheme ................................................................................................. 23
6.5.1 System Evaluation ........................................................................................................ 24
6.6 Facilities Description ........................................................................................................... 24
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6.6.1 Environmental control .................................................................................................. 24
6.6.2 Building Requirements ................................................................................................. 25
6.7 Commissioning and Integration ........................................................................................... 25
6.8 Proposed Timeline ............................................................................................................... 25
6.9 Project Risks and Mitigation ................................................................................................ 26
Barge timing – missing the window of opportunity for barge transport may delay the project by
8 – 10 months. VRB Power will build all project milestones and deliveries based on early
season barges to allow for possible timeline slip. ....................................................................... 26
7.0 VRB Project Management ....................................................................................................... 26
Appendix 1 – Schedule A ................................................................................................................... 27
Appendix 2 – Preliminary Schedule ................................................................................................... 28
Appendix 3 – Layout Drawings .......................................................................................................... 29
Appendix 4 – Process Drawings ......................................................................................................... 30
Appendix 5 – Electrical Drawings ...................................................................................................... 31
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1.0 Executive Summary
VRB Power Systems Inc. (VRB Power) was approached by the Kotzebue Electric association to
investigate the addition of a Vanadium Redox Battery Energy Storage System (VRB-ESS) to a hybrid
diesel-wind generation system. It was found that a VRB-ESS could provide savings in ongoing
operating costs with a reasonable initial capital investment.
The recommended solution is a 600kW x 3 hr VRB-ESS installed in a new building immediately
adjacent to the existing KEA generation facility. As the KEA increases its reliance on wind energy, the
size of the VRB-ESS should be increased to 1200kW while keeping the storage the same for a total
of 1800kWhr.
The primary focus of this report is to provide the required economic benefits of the VRB-ESS. The
preliminary design for the system is presented along with supporting documentation to facilitate the
implementation stage of the project. A detailed division of responsibility is provided to clarify the roles
of both KEA and VRB during the implantation phase of the project.
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2.0 Terms and Acronyms
BOC - Bottom of Charge
BOP - Balance of Plant, mainly customer supplied components / sub-systems
DVT - Design Verification Testing
FAT - Factory Acceptance Testing
HMI - Human Machine Interface
HOMER - Analytical modelling software developed by a US government lab used to
determine economic viability of renewable energy projects
KEA - Kotzebue Electric Association
OEM - Original Equipment Manufacturer
PF - Power Factor
PCS - Power Conditioning System
PLC - Programmable Logic Controller
POC - Point of Connection
RAPS - Remote Area Power Supply
SOC - State Of Charge
TOC - Top of Charge
VRB - Vanadium Redox Battery or a single module in a multi-module VRB-ESS
VRB-ESSTM - Vanadium Redox Battery Energy Storage System
VRB Power - VRB Power Systems Inc
Vref - Reference cell voltage
The words shall, must, and imperative forms identify mandatory material. The words should and may
identify optional material.
3.0 Introduction
The Kotzebue Electric Association (KEA) is an electricity generation co-operative located in Kotzebue
Alaska. The village of Kotzebue is located on the coast, in the arctic. It is isolated from the rest of the
state electric grid, and it is reliant on local generation. The backbone of the generation system is a
group of diesel generators. Due to declining support from the state legislature to keep energy costs in
rural Alaska at reasonable levels, KEA has been forced to look for lower cost energy solutions. The
KEA has worked to become a pioneer in the use of wind energy in an arctic environment. KEA's wind
energy program provides an alternative source of energy with the potential to keep electric costs at
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affordable levels. KEA is Alaska’s first utility wind farm with a current installed capacity of
approximately 1MW peak.
As the KEA increases its wind generation capability, the volatility of the power generation will also
increase. This is a result of variation in wind speeds over time. Therefore, there will be a greater need
for power smoothing which can best be done using an energy storage system such as a Vanadium
Redox Battery Energy Storage System (VRB-ESS™).
3.1 Customer Need/Background
3.1.1 Current System
The current generation for the KEA is done using a combination of diesel generators and wind
turbines. The wind farm is located approximately 4.5 miles from the diesel generator plant. The
existing feeder line is rated for approximately 2.5kW. The existing grid characteristics follow:
• Voltage: 7.1/14.4 kV
• Frequency: 60Hz +/-0.5Hz
• Power Factor: 0.92 lagging
The village of Kotzebue loads (according to data provided by KEA) are approximately as follows:
• Average load: 2.7MW
• Max Load: 3.9MW
• Min Load: 1.7MW
This translates into approximately 64MW-hr per day (2.7MW average) with a peak demand of
approximately 3.9MW. The current generation capacity from diesel Powered Generators is as follows:
• 1 (one) x 3.080MW EMD 710 Series - 20 cylinder (nominally called 3MW)
• 2 (two) x 2.685MW EMD 710 Series -16 cylinder (nominally called 3MW)
• 1 (one) x 1.025MW Cat 3516 Series – 16 cylinder (nominally called 1MW)
• 1 (one) x 1.025MW Cat 3512 Series – 12 cylinder (nominally called 1MW)
• Power generated at 4,160V, stepped up to 12.5kV, 3-phase, 3 wire distribution to town
• Generation building bus – 1200A
The wind farm consists of 18 turbines with a nominal capacity of approximately 1.1MW. It consists
primarily of Atlantic Orient Corporation (AOC) 15/50’s rated at 66kW each.
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The generation system is managed using a supervisory system based on GE programmable logic
controllers (PLCs) and redundant servers. The governors are tied together and there is a PF
controller used to optimize the output. The dispatch decision is based on a “lookup table” that runs on
the server. The lookup algorithm is based on load and attempts to make use of the most effective
means of generating power. In general, this means that generators are constrained to operate as by
sharing loads based on best operating efficiency. Currently, any generation derived from the wind
farm is treated as negative load. In other words, any power generated from the wind farm is first
subtracted from the total load prior to setting generator outputs.
In addition to power generation, thermal waste (heat) produced by the generators is used to maintain
building temperatures in cold weather conditions.
3.1.2 Planned Expansion
The KEA will be adding wind capacity as part of a planned expansion and continued effort to reduce
reliability on diesel fuel as a means of generating power. The planned final capacity will be
approximately 3.5MW. The time horizon for the planned expansion is approximately two (2) years.
3.1.3 Constraints/unique challenges
The most obvious challenge for any project undertaken in a remote community is access for
installation and reliability of the equipment. Equipment must be as reliable as possible to limit required
repairs.
There are significant costs associated with transportation of materials and timing. Logistics planning
will play a role in ensuring the most cost-effective means of transport.
The remoteness of the community also limits the timing for system delivery to site. The only two
options for transport are barge or aircraft. The size of the VRB-ESS will restrict the transportation to a
barge and the timing will be limited due to expected ice during most of the year. The expected
window of opportunity for transportation of the system to the site in Alaska is considered to be from
early June to mid – August.
The extreme temperatures (mostly cold) during much of the year must be considered when situating
operating equipment in Kotzebue.
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3.2 VRB as a solution
The VRB-ESS is a strong complement to the current and planned generation system at Kotzebue.
Ultimately, the VRB-ESS will improve system efficiency and reduce emissions by reducing reliance
on diesel generators.
In an electrical system prone to energy fluctuations the VRB-ESS can act to smooth power. It can
respond almost instantaneously (<0.5 seconds) to load fluctuations and absorb energy within milli-
seconds. This provides voltage and frequency stabilization with out the need to run generator sets in
a spinning reserve mode. For power factor control, the VRB-ESS uses reactive power compensation.
3.2.1 VRB vs. Batteries
There are several advantages of the VRB-ESS over regular lead-acid batteries. The amount of
energy stored is independent of the power rating and is determined by the amount of electrolyte
available. In contrast, to add stored energy to a lead-acid battery system, additional batteries must be
added. The VRB-ESS will show no capacity fade due to cycling, is more efficient and is well-suited to
deep discharge (0% charge to full capacity).
3.2.2 Load – Leveling
This is done by reducing part-load operation of generators. Energy is stored by running the diesel
generators at a higher, more efficient load point and storing the excess generated power in the VRB.
Then as demand changes, the VRB can either supplement a higher peak load or provide power while
reducing the number of on-line generators
3.2.3 Wind Variability
For any wind system, the VRB-ESS stores energy that exceeds the load and shifts it to periods of
higher demand. The VRB-ESS is suitable for addressing typical issues associated with wind
generation such as gusts, inversion layers, diurnal cycles and long term wind pattern changes.
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4.0 Project/Report Scope
This report is limited to addressing the key issues required to support the final design and installation
phase of a VRB-ESS installation in Kotzebue. More specifically, this project addresses the following
items:
1. An updated HOMER model
2. An economic model showing the benefits of a VRB-ESS. The economic analysis is limited to the
VRB-ESS and does not take into account the costs of constructing a building with its associated
systems (ventilation, lighting etc).
3. A refined VRB-ESS layout – (tank sizes, space required, clearances, equipment weights etc)
4. A high-level controls strategy and control system description
5. A detailed scope of supply from VRB Power Systems Inc.
6. Interface requirements for the VRB-ESS
7. A conceptual layout for the second phase of the project
This report will not provide the following items:
1. Detailed design of the building and associated mechanical systems.
2. Overall generation system energy management recommendations – this is the responsibility of
the KEA
3. Details of the internal components and design of the VRB-ESS
4. Estimated costs associated with the building required to house the VRB-ESS
5. Details associated with the second phase of the VRB-ESS installation
5.0 Proposed Solution
It is the recommendation of VRB to install a VRB-ESS in two phases. Phase 1 would be a 600kW x 3
hr system followed by an upgrade to an 1800kW x 1.5 hr system in the future. The details of our
recommendation are described below. For the purpose of the technical details of this report, the
phase 1 system will be described.
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5.1 Economic Case
This section describes the economic case for using a VRB-ESS with the KEA generation
configuration. The economic case is based on a model created using HOMER. HOMER is a software
tool created by the National Renewable Energy Laboratory (NREL) that can be used to model and
optimize hybrid renewable energy systems. A model created with HOMER can be used to project
energy costs for various configurations of a renewable system made up of multiple components.
HOMER also provides the most cost efficient solution along with the ability to calculate net present
value of a project for comparison to others on a financial basis.
The economics of the KEA system are based on the use of the HOMER model with inputs that have
been agreed upon between KEA and VRB Power.
Important HOMER model inputs are describe below:
Current System
Load Data: Provided by KEA
Wind data: Provided by KEA
Wind turbines: 18 x AOC 15/50’s (total of approximately 1,100 kW)
Generators: 1 EMD 2865kW
1 Cat 3512 900kW
1 Cat 3526 1000kW
Future System
Same as above, with the addition of 10 x Furlander 250’s (an additional 2.5MW of capacity).
General inputs/both models
Diesel Fuel:
Price $1.3/litre
Lower Heating Value 43.2 MJ/kg
VRB-ESS costs: $458k per 150kW stack module
Electrolyte does not wear out, stack replacement 15 years
Financial Inputs affecting Payback Calculations
Annual real interest rate: 5.25%
Project life 20 years
System Annual O&M fixed $5,000/year
There are no costs associated with the environmental impact of using diesel fuel in the model.
The payback is estimated using the calculation within HOMER which ranks the solutions after doing a
sensitivity analysis according to the cost of energy (COE) for the solution.
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Storage vs. power
The HOMER model only ranks the solutions based on the cost of energy. It does not take into
account the value of added storage capacity that a VRB provides. This is one of the primary reasons
that more storage is suggested. The added storage will provide more flexibility to the operation of the
system and additional security of supply.
5.1.1 Add VRB to Current System
Using HOMER Model
With the existing wind generation capacity in place (18 x AC15/50s), the comparable economics are
shown below (Homer Model 600kW VRB –KEA 20081101.hmr). The economics when compared with
the base case (no VRB), provide a solid case for investment in a VRB-ESS. The comparative
payback results for a 600kw (1800kWhr) system with a 600kW converter versus the system without a
VRB-ESS is provided below. Note that this is not necessarily the optimum solution (on a cost per kWh
basis) for the configuration provided, but it still provides payback in just over 3 years.
Table 1 - 600kW x 3hr vs. BASE
Metric Value
Present worth $ 8,082,667
Annual worth $ 662,393/yr
Return on investment 32.6 %
Internal rate of return 31.3 %
Simple payback 3.17 yrs
Discounted payback 3.57 yrs
Note: For details see HOMER model 600kW VRB-KEA 20081101.hmr
5.1.2 Add VRB to future System
KEA intends to install additional wind capacity within 2 years increasing the capacity to approximately
3.5 MW. This is modeled by using a combination of 18 AC 15/50’s (66kW each) and 10 Furlander
250s (250kW each).
The future system model utilizes the same inputs as above with the addition of the extra wind
capacity. According to the model, the optimum solution for a VRB-ESS is 2400kW x 40 minutes
(1800kWhr). However, when the initial capital cost is taken into account it makes more sense to use a
smaller battery with more storage. A better solution would utilize the existing storage (existing
electrolyte) and add only to the instantaneous power capability of the system. This will lead to using a
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1200kW VRB-ESS with 90 minutes (1-1/2 hours) of storage (see Table 2 for a basic comparison of
HOMER results). By only increasing the instantaneous power capability of the system, the capital
investment required for a more optimum solution can be minimized, while gaining the benefit of a
lower cost of energy.
Table 2 - Future VRB system with increased wind
System Initial
capital
cost
COE
($/kWhr)
Renewable
Fraction
(%)
Estimated
diesel usage
(liter/year)
2400kW x 0.66hr = 1800kWhr $6.877M 0.396 19% 5.630M
1200kw x 1.50 hr = 1800kWhr $4.697M 0.398 20% 5.612M
No VRB-ESS $0 0.440 19% 6.179M
Numbers from HOMER Model 1200kW VRB-KEA 20081101.hmr
The economics for VRB-ESS can be justified using the model by looking at two cases with the final
installed wind capacity. The valuation below is derived by comparing the 1800kWhr system (with a
1200kW converter) against a system with 54 wind turbines that doesn’t have a VRB. Payback for total
system (2 phases) is estimated below at less than four years.
Table 3 - 120kW x 1.5hr vs. BASE (no VRB-ESS)
Metric Value
Present worth $ 11,812,526
Annual worth $ 968,063/yr
Return on investment 29.2 %
Internal rate of return 28.3 %
Simple payback 3.53 yrs
Discounted payback 4.01 yrs
Note: For details see HOMER model 1200kW VRB – KEA 20081101.HMR
Assuming that KEA has already installed a 600kW x 3hr system, the incremental cost would include
the cost of an additional 600kW of stacks only to reach a more optimal cost of energy. For the
purpose of this report, the incremental cost is estimated at approximately $2M ($1.8M +10%). By
adding the wind and VRB-ESS, the COE drops about 18% per kW-hr from $0.488 to $0.399. So the
savings associated with this additional cost make the case for added wind and storage capacity very
appealing.
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5.2 Battery Design
Battery sizing was determined by using the HOMER models to optimize the overall system based on
cost of energy. The total amount of required storage is based on the initial optimization results of the
HOMER model.
The fundamental design is based on a modular approach. The VRB-ESS is supplied in 150kW
modules. Each module consists of a process module which contains cell stacks, supply pumps,
instrumentation, control and PCS. Each process module is also supplied with a pair of electrolyte
tanks – one for negative electrolyte and one for positive electrolyte. A model of a single 150kW
module is shown below in Figure 1 for reference.
Figure 1 - One (1) 150kW Process Module
Some of the key features of the VRB-ESS required for installation are noted here:
Item Amount Comment
PCS Cabinet
Estimated Mass
Footprint (L x W x H)
550kg
1.8m x 0.6m x 2.2m
Electrolyte Tanks (8)
Estimated Mass: 1 tank (full)
Footprint
Height
23,850 kg
2.6 m diameter
3.6 m
Process Modules
Footprint: (L x W x H)
9.2m x 2.2m x 2.6m 14 support points approximately
evenly spaced
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5.2.1 Electrical
The system is designed to be self-contained on a modular basis. Each 150kW module has a separate
power conditioning system (PCS). This allows maximum flexibility in the operation of the VRB-ESS.
Each PCS is capable of real and reactive power dispatch and charging. Each module can also be
charged or discharged independently. The VRB-ESS has been designed to operate transparently in a
larger system. That is, it operates as a battery would be expected to operate – when voltage is
applied in excess of stored voltage the system charges and vice versa.
To maximize efficiency, the system has been planned using a single isolation transformer. Some of
the other key electrical characteristics are listed here for convenience.
Table 4 - Electrical Characteristics of 600kW VRB-ESS
Item Description Quantity Notes
AC Connection Voltage at PCS 480V 3P 3W, +/- 10% Unit Isolation Txfmr is Required
between 400V PCS and AC Grid
AC Connection Frequency 60hz, +/- 2hz Optional rating is available
Plant Real-Power Rating,
Continuous
600kW, Charge or
Discharge
@ rated Frequency & Voltage.
Note 1
Plant Reactive Power Rating,
Continuous
600kVAR, Lead or Lag @ rated Frequency & Voltage
PCS Apparent Power Rating,
Continuous
850kVA @ rated Frequency & Voltage
Energy Storage 1,800 kW-Hrs @ 600kW for 3 hrs (Discharge)
5.2.2 Mechanical Systems
All mechanical components required for operation of the VRB-ESS are contained within the modules
unless otherwise noted. In general, all piping has been designed using standard piping materials,
sizes and connections to minimize any potential repair or upgrades in the future.
The module cooling will be accomplished using a radiator mounted in an appropriate location on the
process module. The key parameters required for building cooling design are described in the table
below.
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Item Description Quantity Notes
Air/liquid radiator w/fan
Heat Rejection per 150 kW
process module
40 kW Maximum rating
Heat Rejection for (4) 150
kW process modules
160 kW Maximum rating
Off-Module Mechanical
Interconnection piping between electrolyte tanks and process modules is not included in the module
as-supplied. It is important that module to module pressure drop variation is minimized to ensure
consistent module operation. VRB will provide the design to allow a contractor to procure and install
the interconnection piping.
A static nitrogen system is required for safe operation of the VRB-ESS. Nitrogen is applied as a
blanket into the storage tank headspace to pad the tanks, preventing egress of air and reduction of
hydrogen accumulation. After initial installation, it is expected that the system will not require any
significant nitrogen flow. However, over time, nitrogen will escape from the system in small amounts
so the supply cylinders will need to be monitored and replaced periodically. The basic specification for
the system is as follows:
Item Description Quantity Notes
No. of N2 Supply Systems 1 Final Regulator per
150kW Module
Vapor Spaces between
150kW Modules are not be
tied together
N2 Supply Pressure @
Tanks
200 mm of water column
N2 Supply Volume, Normal 0 LPM Per 125kW Module.
5.3 Battery Control
The existing electrical supply facility at Kotzebue is an islanded system in which the VRB-ESS is
connected in parallel with one or more electrical generation sources to form a local “micro” grid (a
typical system is illustrated below in Figure 2). The primary distinguishing technical features of an
islanded system is that the local grid is isolated from all large scale utility grids and the rating of the
VRB-ESS is approximately the same order of magnitude as the total generation capacity connected
to the grid. In these systems, the VRB-ESS must be able to operate as the grid source by providing
voltage and frequency control for the local grid. Alternately, if a generation asset that cannot be
synchronized with other generation assets, such as a diesel generator, is connected to the local grid
then the VRB-ESS must be able to synchronize with the asset acting as the grid source. In some
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Page: 16 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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Commercial Confidential
TEMPLATE: FRM000040 AA
applications, the VRB-ESS must also be able to switch between acting as a grid source and
synchronizing with a generator as a function of the availability of the generator.
Islanded systems are typical of a VRB-ESS connected to a local grid such as may be found in remote
communities or small islands. Common applications include smoothing power fluctuations caused by
variable sources and/or variable loads, grid stabilization, fuel use optimization and power quality.
Figure 2 ‐ Typical Islanded System with VRB‐ESS
5.4 Functional Modes of Operation
The VRB-ESS will provide the energy storage functions described in the following sections.
5.4.1 Energy Supply / Demand Leveling
Energy supply and/or demand leveling, also referred to as smoothing, is a mode of operation in which
the VRB-ESS must stabilize the power output of a variable generation source such as a wind or solar
farm, a variable load such as may be caused by motor stops or starts, or both. The manner in which
this function must be achieved is dependent on the system context, specifically whether the VRB-
ESS is connected to a grid or to an islanded system.
In grid connected systems the objective of energy supply leveling is to smooth the power output of a
variable source such as a wind generator. In this case, the VRB-ESS must operate in response to a
set point that defines the desired power output from the source. Once the set point has been
received by the VRB-ESS it must control the charge and discharge cycle as required to maintain the
REPORT
RPT000201
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Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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commanded power output. The VRB-ESS must also be able to respond to both a simple fixed set
point and a set point that can change over time. Control algorithms for this mode of operation must
be capable of doing predictive control for systems having highly variable generation or load profiles.
In grid connected systems requiring demand leveling, the VRB-ESS must be able to stabilize the grid
voltage in response to sudden, large step changes in the load. In this case, the VRB-ESS must
monitor the voltage at the system connection point and provide VAR control and discharge or charge
as required preventing the voltage at the connection point from changing.
In islanded systems, the objective of both energy supply and demand leveling is to maintain the
voltage and frequency of the local grid. In this case, the VRB-ESS must monitor the system voltage
and frequency and charge or discharge as necessary to maintain the desired system voltage and
frequency.
Figure 3 ‐ Demand Levelling
5.4.2 Time Shifting
In the time shifting mode of operation energy is stored for use at a later time. Typical examples of
this mode of operation are load shaping such as optimizing the run time of a diesel generator and
REPORT
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Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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peak shaving. In this mode of operation the VRB-ESS must respond to a control signal that tells it to
either charge or discharge. The command signal could take one of several forms including, but not
limited to:
• A simple charge / discharge command. In this cast the VRB-ESS must charge or discharge
at a customer selectable rate when commanded. This mode is often referred to as
dispatched mode.
• A time of day input. In this case the VRB-ESS must operate on a fixed time schedule in which
the start and stop times for the charge and discharge cycles are defined.
• A duty cycle input. In this case the VRB-ESS must operate based on an input duty cycle.
The duty cycle could be defined in terms of fixed charge and discharge durations or it could
take the form of charge and discharge start times and durations.
• A cost of electricity input. In this case the VRB-ESS must be operated to minimize the users
total cost of electricity by charging when electricity costs are low and discharging when
electricity costs are high.
Figure 4 ‐ Time Shifting
5.4.3 Power Quality Control
In this mode of operation the VRB-ESS is used to perform power factor correction, voltage correction
and/or frequency control of the system it is connected to. To achieve this, the VRB-ESS must be
capable of receiving command signals for the desired control and then pass them on to the PCS
controller. This mode of operation requires very fast response times to changes on the system.
Therefore, the VRB-ESS must only command set points to the PCS controller. The actual control
inputs and the corresponding outputs must be directly through the PCS.
REPORT
RPT000201
Revision: AA
Page: 19 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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5.5 System Functions
The VRB-ESS shall be capable of performing the functions described in the following sub-sections.
5.5.1 Initial Charge
The VRB-ESS shall have the ability to perform an initial charge from the system point of connection
following system installation, a re-mix of the electrolyte or any other time that the electrolyte state of
charge falls below a preset electrolyte reference voltage lower set point. In a multi-module VRB-ESS,
it shall be possible to independently perform the initial charge for each module.
5.5.2 Charge and Discharge
The VRB-ESS shall have the ability to charge from and discharge to the system point of connection.
The rate of charge or discharge shall operator selectable, either in the form of a simple set point or a
variable input signal to the VRB-ESS.
5.5.3 Power Factor Control
The VRB-ESS shall have the ability to perform power factor control. Power factor control shall be
achieved through the ability to do reactive power injection. The VRB-ESS shall be capable of
performing this function whether or not it is charging or discharging at the time power factor control is
required.
5.5.4 Grid Voltage and Frequency Stabilization
The VRB-ESS shall be capable of performing voltage stabilization for grid connected systems and
voltage and frequency stabilization for islanded or hybrid systems. Grid voltage stabilization shall be
achieved through the ability to do reactive power injection as well as by charging or discharging as
necessary to maintain the voltage at the connection point. In the case of islanded systems, the VRB-
ESS shall also be capable of doing frequency stabilization by providing power to, or absorbing power
from the system.
5.5.5 Control and Monitoring
The VRB-ESS shall be capable of being operated and monitored both locally and remotely. The
VRB-ESS shall also be capable of logging operating data and fault conditions for later retrieval both
locally and remotely. In a multi-module VRB-ESS, independent control, monitoring and data/fault
logging shall be provided for each module. Furthermore, independent module control shall be
provided in a manner that ensures proper coordination between modules.
REPORT
RPT000201
Revision: AA
Page: 20 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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CONSIDERED UNCONTROLLED UNLESS STAMPED OTHERWISE IN RED. Printed on: Wednesday, November 05, 2008
Commercial Confidential
TEMPLATE: FRM000040 AA
5.5.6 Fault Monitoring and Recovery
The VRB-ESS shall be capable of detecting abnormal events or conditions that if undetected could
lead to equipment damage or unsafe operating conditions. The VRB-ESS shall be capable of
performing an attempted automatic recovery from all abnormal events or conditions that do not result
in an unsafe operating condition.
6.0 System Architecture And Control Scheme
6.1 Controller Devices Layout
The VRB-ESS controls system architecture and interconnections are shown in Figure 5 below. The
test stations each have their own controller to maintain operation of low level functions for each ESS
module such as charging and discharging, alarming of the system, input / output conditioning and
data mining. A separate system controller oversees the operation of the entire system operation. This
is referred to as the Application controller. All of these controllers are connected through an Ethernet
network. This network will be connected to the client control system which uses fibre optics by way of
a bridging device to convert between Ethernet and fibre optics.
Figure 5 ‐ Controls System Interconnections
REPORT
RPT000201
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Page: 21 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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6.2 Control Architecture
The control architecture is shown in Figure 6 below. From the bottom the battery module layer and
the hardware layer are responsible for controlling each of the 150kW battery modules. There are
hardware and Ethernet communication links from these layers to the System Control and Application
control layers for transferring status and states information. The Application controls layer is
responsible for overall control of the 4 battery modules and how the VRB-ESS system interacts with
the Client control system. Interfacing with the client controls is done through an Application Interface
layer.
REPORT
RPT000201
Revision: AA
Page: 22 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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Motor Drives, Valves,
Sensors, Contactor PCS Hardware Layer
Battery Module
Control Layer
VRB System Control
Layer
Application Control
Layer
Application Interface
Layer
Application Inputs Application Outputs
Hardwired
Interfaces
VRB Battery Controller
+ Small HMI PCS Controller
Hardware
Interlocks
Hardware
Interlocks
Mode
Commands /
StatusStatus / State ControlHardwired control inputs
and status outputs (e.g.
safety interlocks, grid/
PCS links, etc.)
PCS control must have direct link to
grid for frequency control, VAR
compensation, etc.
X 4 Battery Modules
@ 150 kW each.
Making up total
Power requirement
Of 600 kW
System Application Controller
(May be same as System Contoller)Dispatch/Mode commandsDATA \ Status Info
Figure 6 ‐ VRB‐ESS System Hardware and Software Architecture
6.3 Existing Control System
The existing control system at Kotzebue consists of two fibre optic loops transmitting on TCP
protocols connected via a high speed radio link. One fibre loop is dedicated to controlling the
Generators and the other controls the Wind Farm. Lower level control is done with PLC controllers
REPORT
RPT000201
Revision: AA
Page: 23 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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typically located at each piece of equipment on the fibre optic network. There are two servers on the
generator loop and one on the wind farm loop. The servers are used for collecting data, maintaining
the PLC controllers and serving up thin client applications for interfacing to the control system.
The VRB-ESS control system will be connected to the generator loop using a fibre optic protocol
converter. The VRB-ESS system will interface to the one of the servers on the generator side. Data
will be exported to the server for storage and control and operating signals will be transmitted to the
VRB-ESS from the server. It may be possible for the VRB-ESS control system to serve up a thin
client application representation of the VRB-ESS main operating screens.
6.4 Application Interface Layer
The Application Interface layer communicates information to and from the client control system for
proper operation of the VRB-ESS. The interface communications shall consist of the following inputs
and outputs.
Application Inputs
- Power output set point
- Operating power level set points for Time shifting mode
- Operating power level set points for Demand Leveling mode
- Reactive power to be supplied
Application Outputs
- Data from system IO points
- Operating Data such as; State Of Charge, Capacity, Bus Voltage, Runtimes, Power output, etc.
- Status of system
- System Alarms
- System Alarms history
6.5 Two Mode Control Scheme
In the application of VRB-ESS to the Kotzebue Electric generating facilities it has been determined
that two modes of operation, Demand Levelling and Time Shifting will be required. Each of the four
modules in the VRB-ESS system is capable of being operated either of these modes at any one time
so that the VRB-ESS capacity can be divided into four 150 kW x 3hr segments. The application
controller will be able to switch each modules operation mode under direction from the client’s control
system. The user can configure through the Application Interface layer how many modules are using
REPORT
RPT000201
Revision: AA
Page: 24 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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TEMPLATE: FRM000040 AA
each mode of operation thereby dividing the distribution of storage resources applied between
Demand Levelling or Time Shifting.
In the beginning stages of the operation of the VRB-ESS at Kotzebue the primary objective will be
Time Shifting. Therefore during the first two years the system will be commanded to operate all four
modules in the Time Shifting mode. Later when more Wind power generation is brought online the
system will be primarily providing demand leveling. KEA will also the option of operating in a Time
Shifting operating if required.
6.5.1 System Evaluation
Though the VRB-ESS has been available for several years, this application in a distributed generation
application is considered to be new. The KEA system will be used to further understand system
dynamics and response in a diesel-wind hybrid application and provide valuable feedback into future
VRB-ESS systems.
The objectives of the installation are clear. The KEA wants to prove that a combined VRB-wind
system can save at least 5% (HOMER estimates in annual fuel savings of approximately 6.8%) of
annual energy costs (at the modeled fuel prices).
6.6 Facilities Description
The VRB can be installed within a standard pre-engineered building that has been modified to meet
any local building codes. In addition, requirements for building insulation, fire protection, heating,
cooling and lighting need to be considered.
6.6.1 Environmental control
Based on recorded annual average temperatures, it is recommended that the VRB-ESS use an air-
cooled heat rejection system. This additional heat dumped into the building will be taken into account
when designing the building HVAC systems.
Conceptually, the heat rejected by the VRB-ESS during discharge can be easily accommodated
within the building. The building will be designed with wall fans and louvers (in and out) to provide
heat rejection from the building when required.
It is also recommended that appropriate care is taken to prevent excessive contamination from the
area surrounding the building by adding appropriate filters to building air intake louvers.
REPORT
RPT000201
Revision: AA
Page: 25 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
THIS DOCUMENT IS VALID ONLY AT TIME OF PRINTING. ANY COPIES MADE ARE
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Commercial Confidential
TEMPLATE: FRM000040 AA
6.6.2 Building Requirements
The building will meet basic requirements that have been specified in order to provide the best
possible location of the VRB-ESS. In general the following items need to be addressed:
• area for VRB-supplied equipment.
• Building foundations and slab.
• Tank containment.
• Equipment Foundations and anchors.
• Nitrogen Blanketing System to support the VRB ESS.
• Building Systems, ventilation, fire protection and personnel protection such as safety and or
eyewash showers as governed by local regulations
• Electrical Systems including lighting, grounding, alarms, internet connection, high voltage supply,
distribution and transformers.
Refer to SPC000348 - Specification, Building Criteria for VRB-ESS (120 VAC 60 Hz) for more detail
on the building requirements.
6.7 Commissioning and Integration
VRB Power will provide commissioning services and work in full cooperation with the KEA for
integration of the VRB-ESS into the existing micro-grid.
6.8 Proposed Timeline
It is expected that a 600kW VRB-ESS would require – 6 months from order to be ready on dock at
VRB Power. Additional time needs to be accounted for in arranging transport to an appropriate port
for barge transport to Kotzebue.
Major milestones for the project are summarized below (refer to appendix for preliminary schedule)
Item Time from receipt of order (ARO)
Completed Integration Engineering Week 13
Procurement/delivery of major components Week 26
Deliveries to Site Week 26 – Week 30
Installation of VRB into building Week 36
Fill System and commission Week 44
REPORT
RPT000201
Revision: AA
Page: 26 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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6.9 Project Risks and Mitigation
Barge timing – missing the window of opportunity for barge transport may delay the project by 8 – 10
months. VRB Power will build all project milestones and deliveries based on early season barges to
allow for possible timeline slip.
Control Scheme - operating using a combined load-shift and power smoothing function has not been
proven. VRB Power will undertake lab testing to refine the required controls to prove this strategy.
7.0 VRB Project Management
VRB will ensure maximum benefit and smooth integration by providing a dedicated project manager
to the fabrication and installation of the VRB-ESS. As part of the ongoing deliverables, the project
manager, on behalf of VRB Power will provide regular updates on progress to the KEA. The project
manager will act as a dedicated single point of contact for KEA until the delivery of the system to site.
Once the system has been delivered, the VRB Power Technical Services Team will provide all
required support to the KEA.
REPORT
RPT000201
Revision: AA
Page: 27 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
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Commercial Confidential
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Appendix 1 – Schedule A
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 1 of 21
1) Plant Ratings
a) The VRB ESS Plant will be comprised of one ‘600 kW’ unit, which is made up of
four ‘150 kW’ modules for a continuous plant rating of 600kW. The Plant will
have the following ratings;
Item Description Quantity Notes
AC Connection Voltage at
PCS
480V 3P 3W, +/- 10% Unit Isolation Xfmr
Required between 400V
PCS and AC Grid
AC Connection Frequency 60hz, +/- 2hz Optional rating is
available
Plant Real-Power Rating,
Continuous
600kW, Charge or
Discharge
@ rated Frequency &
Voltage. Note 1
Plant Reactive Power
Rating, Continuous
600kVAR, Lead or Lag @ rated Frequency &
Voltage
PCS Apparent Power
Rating, Continuous
850kVA @ rated Frequency &
Voltage
Energy Storage 1,800 kW-Hrs @ 600kW for 3 hrs
(Discharge)
Notes:
1. Includes electrolyte pumping and PCS losses. It excludes lighting, transformer, HVAC and cooling
losses.
2) General Scope
This document outlines the high level Scope of Supply, as supplied by the Seller.
Refer to the Seller’s drawings DRW001272 and DRW001273.
a) Included in Sellers Scope of Supply
i) Major Components:
(a) Electrolyte – 134,000 liters
(b) Provided in 1,000 liter totes.
(2) Process Modules – QTY (4) rated for ‘150kW’ each.
(a) Process Modules contain cell stacks, pumping and piping systems,
process cooling equipment and electrics and controls.
(b) Each Process Module is shipped as 3 items (one pump module and
two stack modules)
(3) Power Conditioning System – QTY (4) Units (one per module).
(a) Shipped as four items.
(4) Tanks – QTY (8) 4,500 USG (17,070 liter) nominal.
(a) Shipped as 8 items.
(5) Manual and Automated Valves Off-Process Module – identified on
Seller’s P&IDs.
(a) Shipped as four lots.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 2 of 21
(6) Tank Dip Tubes - identified on Seller’s P&IDs.
(a) Shipped as four lots.
(7) Instrumentation - identified on Seller’s P&IDs.
(a) Shipped as four lots.
b) Services Provided by Seller:
i) Engineering
(1) Drawings and/or specifications that allow the Purchaser’s contractor to
construct the building, building systems and interconnecting systems
between the Seller’s process modules and electrolyte storage tanks.
Note that this package will follow direct discussions and agreement
between the Purchaser and Seller.
(a) Specifically applying to the interconnecting piping systems shown on
the Seller’s P&IDs the Seller shall provide criteria drawings and
specifications which shall guide the Purchaser’s installation contractor
in the detailing of the system while adhering to the Seller’s process
requirements.
(2) Operating and maintenance manuals for system.
(3) Technical liaison activities associated with the Seller’s Scope of Supply.
ii) Project Management
(1) Liaison and coordination between the Seller and Purchaser and the
Purchaser’s engineer and installation contractor.
iii) Procurement
(1) All activities necessary to provide the Seller’s Scope of Supply.
iv) Construction Technical Support
(1) The Seller shall provide the technical resources necessary to inspect,
monitor and sign off on the acceptance of the installation of Seller’s
Scope of Supply as identified in the Sellers specifications.
v) Commissioning
(1) The Seller shall provide the technical resources to commission the
Seller’s system.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 3 of 21
c) Not Included in Scope of Supply:
i) Major Components:
(1) Foundations and anchors for items in Seller’s Scope of Supply.
(2) Building foundations, slab and tank containment.
(3) Building.
(4) Building systems including; HVAC, chiller, personnel protection
equipment and systems such as safety showers, isolation transformers,
AC switchgear, lighting, grounding, security, alarms and controls for
building systems.
(5) Materials for all interconnecting systems between the Seller’s process
modules and electrolyte storage tanks including piping, pipe supports and
electrical and controls cabling.
ii) Services:
(1) Receiving and storing of Seller’s Scope of Supply at site.
(2) Installation labour, supervision, first aid, security and construction
management to install the items in Seller’s Scope of Supply.
(3) Procurement of building and building systems
(4) All permitting and local customs import duties and taxes.
(5) Insurance.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 4 of 21
3) Itemized Scope
a) Engineering
Description VRB
(Seller) Purchaser Notes
Process Design:
Tank Sizing &
Specifications 9
Process Pipe Sizing &
Specifications 9
Pump Sizing &
Specifications 9
Valve Sizing &
Specifications 9
Equipment Schedule 9
Nitrogen Blanketing
Requirements
Specifications
9
Chilled Water
Requirements
Specification
9
Electrolyte Transfer
Equipment 9
On-Module Design:
Module Steel Design 9
Module Piping Design 9
Control & Electrical
Schematic Diagrams 9
Control Cabinet Layout
Diagrams 9
Wiring Diagrams 9
Cable Schedules /
Block Diagrams 9
Instrument
Specifications 9
Grounding Point
Design 9
Off-Module Design: Review By VRB
[Seller]
Electrolyte Piping
Design To/From Tank 9
Vent Piping Design
To/From Tank 9
Pipe Routing &
Loading Design 9
Pipe Support System
Design 9
Access Platforms and
Ladders Design 9 If Required
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 5 of 21
Description VRB
(Seller) Purchaser Notes
Electrical Power
Systems Design:
HV System Study &
Integration 9
Harmonic Study 9
HV Single-Line
Diagram 9
Protection & Metering
Design 9
Single-Line Diagram
for Process Equipment
(PCS, Cellstack)
9
Cable Schedule / Block
Diagram for Process
Equipment
9
Cable Schedule / Block
Diagram for non-
Process Equipment
9
Plant Grounding
System Design 9
PCS Specifications 9
Controls Design:
Specify Unit PLC
Hardware 9
VRB ESS Control
System Architecture
and Design
9
Schematic Diagrams
for all Process Controls 9
Schematic Diagrams
for all systems other
than Process Controls
9 Auxiliaries and bid
services
Cable Schedules /
Block Diagrams for all
Process Controls
9
Cable Schedules /
Block Diagrams for all
non-Process Controls
9
Wiring Diagrams for all
Process Controls 9
Wiring Diagrams for all
non-Process Controls 9
Instruments:
Specify all Process
Instruments 9
Specify all non-
Process Instruments 9
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 6 of 21
Description VRB
(Seller) Purchaser Notes
Site Design:
General Civil Design 9
Drainage Design 9
Road & Access Design 9
Environmental 9
Fencing & Security &
Protected Storage
Design
9
Site Legal 9
Building Design:
Soil Study, Geo-Tech 9
Foundation, Containment
Design 9
Building Steel Design 9
Seismic Design 9
Building Cladding /
Insulation Design 9
Painting Specifications 9
General Equipment
Layout 9
Loading Requirements
for Process Equipment 9
Heating & Ventilation
Requirements for
Process Equipment
9
HVAC Design 9
Nitrogen Gas Delivery
System 9
Sprinkler / Fire Alarm
System Design 9
PPE (Personnel
Protection Equipment),
such as eyewash and
safety showers
9
Permits:
Obtain Environmental
Permits 9
Obtain Building Permits 9
Obtain Trades Permits 9
Manuals:
Operations and
Maintenance 9
1 Hard Copy and 1
Electronic Copy
Included.
Other:
On-Site Training 9 5 Days for 4
Personnel Included
Spare Parts Schedule 9
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 7 of 21
As-Built Drawings of
Seller's Scope of Supply
Items
9
As-Built Drawings of
Purchaser’s Scope of
Supply Items
9
b) Supply and Install
Description VRB (Seller) Purchaser Notes Supply Install Supply Install
Site Services:
Surveying 9 9
Excavation 9 9
Site Drainage 9 9
Roads & Access 9 9
Paving & Road
Surfaces 9 9
Fencing 9 9
Site Security 9 9
Signage 9 9
Water Supply,
Buried 9 9
9 9
Communications 9 9
Telephone 9 9
Internet 9 9
Other (specify)
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 8 of 21
Description VRB (Seller) Purchaser Notes Supply Install Supply Install
Building
Systems,
General:
Foundations 9 9
Slab 9 9
Bldg Steel 9 9
Platforms 9 9
Cladding 9 9
Roof 9 9
Insulation 9 9
Man Doors 9 9
Equipment
Doors 9 9
Wall Openings
for HVAC,
Process, etc
9 9
Painting, Slab 9 9
Painting, Bldg &
Steel, Touchup 9 9
Building
Systems,
Mechanical:
Ventilation
Systems 9 9
Heating
Systems 9 9 If required
Water Systems,
Indoor 9 9
Sprinkler / Fire
Alarm Systems 9 9
Nitrogen Gas
Supply Delivery
System
9 9
Initial Charge,
replacement bottles by
purchaser
Nitrogen Low-
Pressure Let-
Down System
9 9
PPE (Personnel
Protection
Equipment),
such as
eyewash and
safety showers
9 9
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 9 of 21
Description VRB (Seller) Purchaser Notes Supply Install Supply Install
Building
Systems,
Electrical Power
Supply:
High Voltage
Feeders
(including
terminations)
9 9
High Voltage
Switchgear 9 9
Metering &
Protection
Systems
9 9
Isolation [Power]
Transformers 9 9 Specified by VRB.
Low Voltage
Switchgear 9 9
Low Voltage
Feeders 9 9
Panel boards 9 9
Motor Control
Center MCC1 9 9
If required. For
example for HVAC
breaker.
UPS (For Control
Systems) 9 9
Cabling for
Metering &
Protection
Systems
9 9
Anchor-Bolts,
Restraint System
for Electrical
Equipment
9 9
Building
Systems,
Electrical
Services:
Lighting &
Receptacle
Services
9 9
Including fixtures,
lamps, fittings, cables,
etc
Gas (H2)
Detection 9 9
Including sensors,
fittings, cables,
calibration-gas etc
Security Systems 9 9 Including sensors,
fittings, cables, etc
Lighting & Service
Panel boards 9 9
Heating,
Ventilation, Chiller
Controls
9 9
Including sensors,
fittings, controls,
cables, etc
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 10 of 21
Description VRB (Seller) Purchaser Notes Supply Install Supply Install
Building
Systems,
Grounding:
Buried & Under
Slab Grounding
Systems
9 9
Building Steel
Grounding 9 9
Electrical
Equipment
Grounding
9 9
Process Module
Grounding 9 9
Lightning
Protection
Systems
9 9
Cable Tray
Grounding 9 9
Electrolyte
Storage System:
Tanks 9 9
Future tank
replacement may
require building
design
considerations.
Anchor-Bolts for
Restraint System 9 9
Restraint System,
Tanks to Anchor
Bolts
9 9
Instrumentation 9 9
Electrolyte 9 9
Pressure /
Vacuum Relief
Devices
9 9
Instrumentation
Cabling back to
PLC Control
Panel
9 9
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 11 of 21
Description VRB (Seller) Purchaser Notes
Supply Install Supply Install
Process
Modules:
Anchor Bolts, In-
Slab 9 9
Module Steel 9 9
Module Steel
Painting 9 9
On-Module Piping
Systems 9 9
Cell stacks 9 9
Electrolyte Pumps 9 9
Electrolyte Heat
Exchangers 9 9
Basket Strainers 9 9
Automatic Valves 9 9
Manual Valves 9 9
Instrumentation 9 9
Adjustable Speed
Drives (for
electrolyte
pumps)
9 9
Cell stack Fusing 9 9
Cell stack Current
Monitoring 9 9
On-Module
Electrical Cabling
(AC & DC)
9 9
On-Module
Instrument &
Control Cabling
9 9
On-Module Cable
Tray Systems 9 9
Module
Installation @ Site 9
Off-Module
Piping Systems,
Electrolyte:
Tanks to Modules
(Electrolyte
supply)
9
Modules to Tanks
(Electrolyte
return)
9
Vent Piping
Systems
9
Pipe Supports for
all Off-Module
Piping Systems
9 9
Does not include
building components.
Can be pre-
engineered for onsite
installation.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 12 of 21
Description VRB (Seller) Purchaser Notes
Supply Install Supply Install
Off-Module
Cabling Systems
Off-Module Cable
Tray Systems 9 9
Off-Module
Electrical Cabling
Systems (AC &
DC)
9 9
Off-Module
Instrument &
Control Cabling
Systems
9 9
Process
Controls:
Module PLC CPU 9 9 For Process Module
Module PLC Input
/ Output
Hardware
9 9
Module PLC
Control Cabinet 9 9
Local Operator
Interface
Terminal, LCD-
based, Suitable
for Trouble-
Shooting and
Maintenance
9 9
Module PLC
Configuration 9 9
Main [Master]
Operator
Interface Terminal
9 9
Data Historian 9 9
Ethernet
Backbone 9 9
P&Q (or F&V)
Control
Algorithms
9 9
Seller will develop or
coordinate with
purchaser
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 13 of 21
Description VRB (Seller) Purchaser Notes Supply Install Supply Install
Power Conditioning
System (PCS):
PCS 9 9
PCS interconnecting
cabling 9 9 Specified by VRB
PCS Configuration /
Interface to PLC 9
Other (during
Construction /
Commissioning
Phase):
Construction
Management for VRB
Scope
9
Construction Office
Space for VRB
Personnel
9
Temporary Washroom /
Lunchroom Facilities 9 9
Construction Power 9 9
Temporary Lighting 9 9
Refuse Bins & Disposal
(Hazardous Waste) 9
First Aid 9
Potable Water 9 9
Flushing Water (De-
Ionized Water) 9 9 Limited amount
required.
Protected Storage Area
for VRB Scope of
Supply
9 9
Major Equipment
(during Construction
Phase):
Crane Rental (for
installation of Tanks &
Modules)
9
Forklift Rental 9
Temporary Water
Treatment System (De-
Ionized Water)
9 IF required.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 14 of 21
c) Commissioning
Description VRB
(Seller)
Purchaser Other
Electrolyte Storage Systems:
Inspect Tanks for signs of physical damage 9
Inspect Seismic Restraint System 9
Inspect Tanks for debris & general cleanliness 9
Fill to 100% level with filtered & de-ionized
water. 9
Flush Tanks 9
Check for vapour-tightness 9
Check for correct operation of N2 Blanketing
System 9
Check for correct operation of Pressure /
Vacuum relief Devices 9
Pumping Systems
Inspect Pumps & Motors 9
Check Motor Winding Insulation 9
Confirm Rotation 9
Measure Current, Voltage, Power @ operating
point 9
Piping Systems:
Pressure Test all Process Piping Systems (with
Cellstacks and Tanks disconnected) 9
Flush with de-ionized water 9
Ensure Basket Strainers are clean 9
Check for correct operation of Automated Valves 9
Cell stacks:
Check for any signs of physical damage 9
Check torque settings 9
Check that all piping and electrical connections
are tight 9
Control Systems (Process):
Check Instrument Calibration 9
Loop Check all Instruments 9
Check all Trips and Alarms; Confirm Setpoints 9
Verify Logic 9
Check insulation resistance of all feeder cables 9
Check interface between PLC and PCU 9
Confirm Communications 9
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 15 of 21
Description VRB
(Seller)
Purchaser Other
Electrical Systems (Process):
Configure Pump ASDs 9
Confirm PCU Configuration 9
Check Insulation of all VRB supplied feeders 9
Confirm correct over current protection devices
& settings 9
Electrical Systems (Power):
Commission HV Cable & Switchgear 9
Commission Transformers 9
Commission LV Switchgear 9
Commission Motor Control Center 9
Ground Resistance Measurement 9
Other
Check that all Equipment, Instruments, and
Valves are correctly tagged 9
Confirm integrity of Secondary Containment 9
Confirm operation of Eyewash / Shower Station 9
Commission Building HVAC Systems 9
Commission Chilled Water Systems 9
Commission Lighting Systems 9
d) Spare Parts Recommended
Description Quantity Units
Tanks
Manhole Cover Gaskets 1 Ea
Piping Systems
Gaskets, each size 1 ea size
Valves, Manual 1 ea size
Pumps
Pump c/w Motor 1 Ea
Pump rebuild kit 1 Ea
Pump Motor 1 Ea
Electrical
Adjustable Speed Drive 1 ea
AC Fuses, < 30A 10 ea size
AC Fuses, =>30A 5 ea size
DC Fuses 2 ea size
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 16 of 21
Description Quantity Units
Controls
PLC Processor Module 1 ea type
Discrete Cards 1 ea type
Analog Cards 1 ea type
Signal Conditioners 1 ea type
Power Supply 1 ea type
Instruments
Pressure Transmitter 1 ea type
Temperature Element 1 ea type
Flow Transmitter 1 ea type
Valve Actuator 1 ea type
Reference Cell 1 ea
Gauges 1 ea type
PCS
IGBT Stack 1 ea
Capacitor 1 ea
IGBT Driver Boards 2 ea
Other
Special Tools none
Note: Cost of Recommended Spare Parts is
not included in Lump Sum Price.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 17 of 21
4) Interface Requirements
a) This section outlines the interface requirements between the Plant and
Equipment, as supplied by the Seller, and the Plant and Equipment, as supplied
by the Purchaser. This information is preliminary and will be finalized per the
Seller’s Scope of Supply identified in this document.
b) Building Requirements
i) Process Building Requirements
(1) The Purchaser-provided building shall satisfy the following requirements
for the process area;
Item Description Quantity Notes
Interior Dimensions Per attached General
Arrangement Dwgs
Secondary Containment Per Local Building Code
Requirements
Maximum allowable
Temperature
30°C Exceeding this
criteria requires
VRB approval
Minimum allowable
Temperature
Not less than 10°C
Maximum allowable
Humidity
< 95% non-condensing
Minimum Air Change Rate Per Local Building Code
requirements
Seismic Per Local Building Code
requirements
Heat Rejection from Seller-
Supplied Process
Equipment
40 kW max @ 25°C per
module (expected 160kW
for 4 modules)
To come per
Seller’s
Engineering Scope
of Supply
Lighting Per Local Building Code
requirements
Building Heat load
For additional details, see VRB Building Criteria Specification SPC000348.
ii) Electrical Room Requirements
(1) The Purchaser-provided building shall satisfy the following requirements
for the electrical room;
Item Description Quantity Notes
Interior Dimensions Per attached General
Arrangement Dwgs
Maximum allowable
Temperature
Not more than 38°C Exceeding this
criteria requires
VRB approval
Minimum allowable
Temperature
Not less than10°C
Maximum allowable
Humidity
< 95% non-condensing
Minimum Air Change Rate Per Local Building Code
requirements
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 18 of 21
Seismic Per Local Building Code
requirements
PCS Heat Rejection (with
air-cooled PCS)
Included in heat rejection
above
Does not include
Heat Rejection
from Purchaser-
Supplied Isolation
Xfmrs
Lighting Per Local Building Code
requirements
iii) Mechanical Utility Requirements
(1) The Purchaser shall provide the following mechanical utilities for use by
the SELLER-supplied process Modules; The SELLER will provide the
design.
Item Description Quantity Notes
Nitrogen (N2) Blanketing
Supply (for Tanks):
No. of N2 Supply Systems 1 Final Regulator per
150kW Module
Vapor Spaces
between 125kW
Modules are not be
tied together
N2 Supply Pressure @
Tanks
200 mm of water column
N2 Supply Volume, Normal 0 LPM Per 125kW Module
c) Control Interface Requirements
i) The Purchaser shall provide the following control interface between the
SELLER-supplied controller and the Purchaser’s Master Controller;
Item Description Quantity Notes
Communications Link Ethernet
P&Q or F&V Set points (to
PCS)
Supplied by Purchaser
Battery State-of-Charge Supplied by Seller
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 19 of 21
5) Acceptance Testing
Acceptance testing shall be done as soon as reasonably possible after
Commissioning and the initial charging of the VRB-ESS. Seller shall give Purchaser
not less than 3 days’ notice that the VRB-ESS is ready for testing.
Operation of the VRB-ESS during testing will conducted under the direction and
supervision of Seller. Purchaser shall be entitled to have representatives present
during testing but shall not unreasonably delay start or continuation of test due to his
absence.
Test results shall at all times be determined from data generated by calibrated
instruments following procedures, protocols and methods established by Seller and
approved by Purchaser, which approval shall not be unreasonably withheld or
delayed.
Seller shall at all times be entitled to make such adjustments during testing as it
deems appropriate in order to facilitate proper performance of the VRB-ESS.
a) Charge / Discharge Test
Initial VRB-ESS conditions for the Charge/Discharge Test shall be:
• Commissioning Complete
• Electrolyte Initial Charging Complete
• VRB-ESS system partially charged at 30-50% SOC
• Electrolyte temperatures less than 30°C
The VRB-ESS shall be operated to demonstrate an average:
i) Constant Real Power Charge Rate of 600kW1 for 3 hours
ii) Constant Real Power Discharge Rate of 600kW1 for 3 hours
Upon completion of a a) (i) and (ii) the Charge / Discharge Test shall be deemed
complete.
1 AC, measured at the Point of Connection (p.o.c.). Includes; electrolyte pumping losses, PCS
losses. Excludes; HVAC, cooling, lighting and transformer losses.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 20 of 21
b) Reactive Power Test
Initial VRB-ESS conditions for the Reactive Power Test shall be:
• Commissioning Complete
• Electrolyte Initial Charging Complete
• VRB-ESS system partially charged at 30-50% SOC
• Electrolyte temperatures less than 30°C
The VRB-ESS shall be operated to demonstrate:
i) Constant Reactive Power charge and/or discharge of 600kVar1, at any real
power setting between 0 and 600kW1 charge and/or discharge, for 1 hour.
Upon completion of b) (i) the Reactive Power Test shall be deemed complete.
c) Storage Capacity Test
Initial VRB-ESS conditions for the Storage Capacity Test shall be:
• Commissioning Complete
• Electrolyte Initial Charging Complete
• VRB-ESS system fully charged
• Electrolyte temperatures less than 30°C
The VRB-ESS shall be operated to demonstrate:
i) A total energy output of 1,800 kW-hrs1
ii) Upon completion of (d) the Storage Capacity Test shall be deemed complete.
VRB Power Systems RPT000201
600kW -1,800 kW-Hr VRB ESS Kotzebue Electric Association
Schedule A Rev AC
RPT000201 Schedule A KEA Rev AC.docx Page 21 of 21
d) Test Conditions
The tests described in sections a) – d) are subject to the following:
i) the VRB-ESS being operated and maintained during the applicable period in
accordance with VRB Power’s operating and maintenance instructions for the
VRB-ESS; and
ii) The ability of the VRB-ESS to dispatch rated Storage Capacity on any day is
subject to the following conditions:
(1) if the capacity of the VRB-ESS was discharged in any period during the
previous 24 hours, then power must have been available and the VRB-
ESS permitted to recharge before the next dispatch for at least 5 hours
after the last dispatch; and
(2) There being no limitation on the recharging power available to the VRB-
ESS for any reason.
For the purpose of the operating conditions in Section 5, the VRB-ESS shall be
considered to have been available to dispatch capacity for 8 hours on any day
where the above conditions have been satisfied.
Upon successful completion of the Charge/Discharge Test, Reactive Power Test
and Storage Capacity Test described above, the Turnover Point shall occur.
Responsibility for operation, control and management of the VRB-ESS shall then
be turned over to the Purchaser.
REPORT
RPT000201
Revision: AA
Page: 28 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
THIS DOCUMENT IS VALID ONLY AT TIME OF PRINTING. ANY COPIES MADE ARE
CONSIDERED UNCONTROLLED UNLESS STAMPED OTHERWISE IN RED. Printed on: Wednesday, November 05, 2008
Commercial Confidential
TEMPLATE: FRM000040 AA
Appendix 2 – Preliminary Schedule
IDTask NameARODuration1Receipt of Order (ARO)W11 day2Engineering60 days9Criteria Package25 days14Procurement126 days42Fabrication86 days99Delivery Milestones88 days100First Tanks Received at SiteARO W260 days101Last Tanks Received at SiteARO W290 days102First Process Module Received at SiteARO W260 days103First Stacks Received at SiteARO W260 days104Delivery of Electrolyte to SiteARO W410 days105PCS Received at SiteARO W310 days106Last Process Module Received at SiteARO W280 days107Last Stacks Received at SiteARO W280 days108Purchaser Construction/Engineering - MilestonesEstimated146 days109Purchaser BLDG Engineering StartARO W160 days110Tank Foundations ReadyARO W270 days111Install Tanks6 wks112Building Ready for Process Module InstallARO W360 days113Install Modules7 wks114Install Stacks7 wks115Install Interconnecting Piping7 wks116Electrical and Controls8 wks117System Ready for ElectrolyteARO W440 days118Load Electrolyte3 wks119System Checkout2 wks120Commission VRB ESS3 wks121Substantial CompletionARO W520 wksReceipt of Order (ARO)W1 Engineering Criteria PackageProcurementFabricationDelivery MilestonesFirst Tanks Received at SiteARO W26Last Tanks Received at SiteARO W29First Process Module Received at SiteARO W26First Stacks Received at SiteARO W26Delivery of Electrolyte to SiteARO W41PCS Received at SiteARO W31Last Process Module Received at SiteARO W28Last Stacks Received at SiteARO W28Purchaser Construction/EngineePurchaser BLDG Engineering StartARO W16Tank Foundations ReadyARO W27Building Ready for Process Module InstallARO W36System Ready for ElectrolyteARO W44Substantial CompletionARO WJanFebMarAprMayJunJulAugSepOctNovDecJan1st Quarter2nd Quarter3rd Quarter4th Quarter1st QuarterTaskSplitProgressMilestoneSummaryProject SummaryExternal TasksExternal MilestoneDeadlineVRB Power Systems Inc.Vancouver, CanadaKEA 1,800kW-hr VRB-ESSPreliminary Project ScheduleRPT000201 AppendixPage 1Project: KEA - 1,800 kW-hr VRB-ESSDate: November 2008ARO - After Receipt of Order
REPORT
RPT000201
Revision: AA
Page: 29 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
THIS DOCUMENT IS VALID ONLY AT TIME OF PRINTING. ANY COPIES MADE ARE
CONSIDERED UNCONTROLLED UNLESS STAMPED OTHERWISE IN RED. Printed on: Wednesday, November 05, 2008
Commercial Confidential
TEMPLATE: FRM000040 AA
Appendix 3 – Layout Drawings
GENERAL NOTES:This layout is Preliminaryand is intended to represent a generic VRB ESS of a 600 kW – 1.8 MWhr installation. It may not reflect the actual Purchaser’s site specific criteria or local regulations. Therefore it may change to suit that specific criteria.The building is intended to be a pre-engineered steel structure.The entire process area shall be curbed to act as a containment area and sloped toward the tank area.The tank area is to be sealed with a suitable coating.The floor area of each unit shall slope toward that Unit’s sump.Each process unit contains (4)150 kW process modules and (8) nominal 17,070 liter tanks.The roof above the tanks shall be designed so as to allow for tank removal.Building height to allow for process module and tank piping clearance.Operating liquid level of tank to be above process module.The general construction sequence is as follows:No 1 – Complete all civil and concrete work.No 2 – Install tanks.No 3 – Complete building installation.No 4 – Complete process installation.Locate Isolation transformer and customer disconnects in existing existing building to reduce required size of new building. Final location to be agreed upon with KEA.Date: 2008 SeptemberPRELIMINARY600 kW – 1.8 MW-HRS VRB ESSGeneral Arrangement, Kotzebue ElectricSIZEQUOTATIONDWG NOREVBDRW01273ABSCALE1:200SHEET1 of 10.0 m. 3.0 m. 5.0 m. 10.0 m.HGFEDCBA87654321HGFEDCBA876543211xxxVRB Supply of (4) Process Modules and (8) Storage TanksProcessingNOM. EL. 0.01xxxELEVATIONPROPRIETARY AND CONFIDENTIALThe information contained in this drawing is the sole property of VRB Power Systems. Any reproduction in part or as a whole without the written permission of VRB Power Systems is prohibited.1.02.01.0Roll Up Door3.53.5Containment Area(2 sides)21.51.5Recommended clearances2.6 Diameter (Approx)1.54.40.6Clear Inside9.2Typical Process ModulePCS(1 per module)Non-Frost Susceptible FillContainment AreaBelow gradeN2 StorageRoll Up Door15.8Air-cooled heat rejection
GENERAL NOTES:The building is intended to be a pre-engineered steel structure.Dimensions are PreliminaryDimensions are provided for planning purposesFuture expansion assumes property is available in the direction indicated and it is obstacle free.Date: 2008 SeptemberPRELIMINARY600 kW – 1.8 MW-HRS VRB ESSSite Plan – Kotzebue ElectricSIZEQUOTATIONDWG NOREVBDRW001272AASCALE1:200SHEET1 of 10.0 m. 3.0 m. 5.0 m. 10.0 m.HGFEDCBA87654321HGFEDCBA8765432121.0PROPRIETARY AND CONFIDENTIALThe information contained in this drawing is the sole property of VRB Power Systems. Any reproduction in part or as a whole without the written permission of VRB Power Systems is prohibited.Roll Up DoorRoll Up Door15.818.0(59' Approx)Existing Generator RoomNew ConstructionExisting Construction(70' Approx)( 69' Approx )New BuildingSee DRW001273 Roll Up DoorPossible location Isolation TransformerFuture Expansion19.5
Roll Up DoorDate: 2008 NovemberPRELIMINARY1200 kW – 1.8 MW-HRS VRB ESSFuture Arrangement, 1200kW x 1.5hr VRBKotzebue ElectricSIZEQUOTATIONDWG NOREVBDRW001278AASCALE1:200SHEET1 of 10.0 m. 3.0 m. 5.0 m. 10.0 m.HGFEDCBA87654321HGFEDCBA87654321PROPRIETARY AND CONFIDENTIALThe information contained in this drawing is the sole property of VRB Power Systems. Any reproduction in part or as a whole without the written permission of VRB Power Systems is prohibited.15.8Replace 8 tanks with 16 at approximately ½ VolumeGENERAL NOTES:The planned expansion is from 600kW x 3hrs to 1200kW x 1.5 hours. The total capacity is planned to remain at 1800kWhr.This layout is a conceptual layout for future planning purposes. It is intended to provide space requirements for a future building size.The building is intended to be a pre-engineered steel structure.The entire process area shall be curbed to act as a containment area and sloped toward the tank area.The tank area is to be sealed with a suitable coating.The floor area of each unit shall slope toward that Unit’s sump.Future expansion should be done as follows:1. Install a building large enough for the first installation of 600kW x 3hrs, followed by an addition to house the new process modules in the future.2. Install new modules and new tanks (smaller in new section of building).3. Replace existing tanks with smaller tanks.4 x 150 kW Modules (future)40.519.0Approx.122 ftApprox.48 ftApproximate extension to building for added modulesRoll Up Door
REPORT
RPT000201
Revision: AA
Page: 30 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
THIS DOCUMENT IS VALID ONLY AT TIME OF PRINTING. ANY COPIES MADE ARE
CONSIDERED UNCONTROLLED UNLESS STAMPED OTHERWISE IN RED. Printed on: Wednesday, November 05, 2008
Commercial Confidential
TEMPLATE: FRM000040 AA
Appendix 4 – Process Drawings
Copyright VRB Power Systems Inc. 2007 - 2008LSHH-MHV-151Storage TankNegative ElectrolyteTE-LT-LSHH-MHV-101Storage TankPositive ElectrolyteTE-LT-MSP-145Seal PotLSL-HGFEDCBA87654321HGFEDCBA876543216"-EP6"-EP6"-EN6"-ENFrom Process ModuleFrom Process ModuleFrom Process ModuleFrom Process ModuleHV-6"-EN-6"-EP-Positive Electrolyte to Process ModuleNegative Electrolyte to Process Module2"-E-Equalization Line2"-V-2"-N2-Nitrogen From Plant Header2 % Slope HP at Process ModuleNotes:ESD (Emergency Shut Down) typical for all tank LSHHs.2”-V-Vented Outside of Building2"-V-For Discussion150 kW – Process Module(4) REQ’dUnless noted otherwise all items are supplied and installed by Purchaser.VRB SupplyVRB SupplyVRB SupplyPROPRIETARY AND CONFIDENTIALThe information contained in this drawing is the sole property of VRB Power Systems. Any reproduction in part or as a whole without the written permission of VRB Power Systems is prohibited.Date: 2008 October 30ISSUED: PRELIMINARY600 kW VRB ESSP&IDOff ModuleSIZEQUOTATIONDWG NOREVBtbaDRW001277AASCALE1:1SHEET1 of 3
HGFEDCBA87654321HGFEDCBA87654321HGFEDCBA87654321HGFEDCBA87654321Copyright VRB Power Systems Inc. 2007 - 20086"-EPPos Return to Tank 101VT-VI-JI-(Power)II-IT-To PCSVT-VI-JI-(Power)II-IT-To PCS6"-EP6"-EN6"-ENPos Return to Tank 101Neg Return to Tank 151Neg Return to Tank 1516"-EN-Neg Electrolyte From Tank 151Positive Electrolyte PumpPurchaser VRB6"-EP-Pos Electrolyte From Tank 101Purchaser VRBNegative Electrolyte PumpPurchaserVRBCoolersNotes:ESD (Emergency Shut Down) typical for all tank LSHHs.PurchaserMaintenance Flush ConnectionVRB1" 1"150 kW Process Module (4) REQ’dVRB SupplyUnless noted otherwise all items are supplied and installed by Purchaser.PROPRIETARY AND CONFIDENTIALThe information contained in this drawing is the sole property of VRB Power Systems. Any reproduction in part or as a whole without the written permission of VRB Power Systems is prohibited.Date: 2008 October 30ISSUED: PRELIMINARY600 kW VRB ESSP&IDProcess Module InterfacesSIZEQUOTATIONDWG NOREVBtbaDRW001277AASCALE1:1SHEET2 of 3Power Input / OutputWarm Air from Electrolyte CoolersFor Discussion
HGFEDCBA87654321HGFEDCBA87654321Copyright VRB Power Systems Inc. 2007 - 2008N2 Gas SupplyN2 Gas Bottles300kPA½” SS Tubing (Swagelock)PSL-1.0kPaPI-PSV-PRV-P11159PRV.-BottleMountedRegulatorsTo (1) 150 kW Process Module See SHEET 1 OF 3N2 Gas Header 200kPaPIPIPIPIBuilding HVAC and ControlsEyewash and Safety Showers per Local RegulationsWashdown Water SystemsPotable Water Systems For DiscussionUnless noted otherwise all items are supplied and installed by Purchaser.Date: 2008 October 30ISSUED: PRELIMINARY600 kW VRB ESSP&IDOff ModuleSIZEQUOTATIONDWG NOREVBtbaDRW001277AASCALE1:1SHEET3 of 3VRB Supply
REPORT
RPT000201
Revision: AA
Page: 31 of 31
Department: PMO
TITLE: Feasibility Study, Kotzebue Electric Association
THIS DOCUMENT IS VALID ONLY AT TIME OF PRINTING. ANY COPIES MADE ARE
CONSIDERED UNCONTROLLED UNLESS STAMPED OTHERWISE IN RED. Printed on: Wednesday, November 05, 2008
Commercial Confidential
TEMPLATE: FRM000040 AA
Appendix 5 – Electrical Drawings
Printed By:Scott GrammPrinted On:2008-10-30 11:29:26 AMTitle Block.Number:DRW001275Rev:Title Block.Lifecycle Phase:PreliminaryI N C O R P O R A T E DPower SystemsVRB
Printed By:Scott GrammPrinted On:2008-10-30 11:28:27 AMTitle Block.Number:DRW001274Rev:Title Block.Lifecycle Phase:PreliminaryI N C O R P O R A T E DPower SystemsVRB