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HomeMy WebLinkAboutBethel Wind Power Project Wind Status Report - Sep 2014 - REF Grant 7040015Bethel Wind Project TDX Power and AVEC Sept 2014 Status Update Bethel Electric Utility •Five – 2.2 MW EMDs- 900 rpm –Min Load roughly 50% (1.2 MW) •City Thermal Loop feed from water jacket heat •Annual Production: –Electricity 39,700 MWh –Thermal 34,500 mmBTUs (10,000 MWh) •Annual Fuel Consumption –3.3 million gallons Homer Model Comparison •2009 chosen for Homer Model •Diesel Only Modeling Verification •Need to define Model input(s) 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 0.9 1.8 2.7 3.6 4.5 5.4 6.3Energy Production MWh MW of Wind Farm Energy Supply as Wind Farm Expands Wind for Thermal Wind MWh Diesel MWh Wind Farm Size Impact on Fuel 0 200,000 400,000 600,000 800,000 1,000,000 1,200,000 1,400,000 0 1 2 3 4 5 6 7Fuel Saved Gallons/yrWind Farm Size MW "Diesel Fuel Saving" Wind Farm Size on Diesel Run Time 0 5,000 10,000 15,000 20,000 25,000 30,000 0 1 2 3 4 5 6 7Diesel Run Hours/YearWind Farm Size MW Diesel Run Hours Diesel Dispatch Strategy 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9MW of SupplyMW of Demand Minimum DEMAND Maximumminimum loadTWO THREE FOUR minimum loadTWO THREE FOUR -1 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9MW of DemandMW of Supply "w 1 MW Wind" DEMAND Maximum Minimumminimum loadArea of Concern -2 0 2 4 6 8 10 0 1 2 3 4 5 6 7 8 9 DEMAND Maximum Minimum w/ 1 MW Wind w/ 2 MW WindAreas of Concern -2 0 2 4 6 8 10 0 1 2 3 4 5 6 7 8 9 DEMAND Maximum Minimum w/ 1 MW Wind w/ 2 MW Wind Two Three Four Dispatchable Thermal Loads 1.8, 2.9 and 6.3 MW of Wind 1.8, 2.7 and 6.3 MW of Wind 6.3 MW Wind-Excess Electricity y = -0.8765x3 + 24.205x2 - 151.31x + 278.93 R² = 0.9994 0 50 100 150 200 250 300 350 400 450 500 550 0 2 4 6 8 10 12 14 16 18 20 22 24 26kWmeters/sec V-39 Vestas Curve Bethel Turbulence Analysis Very low turbulence 1st Standard Deviation is 0.06 of the mean V mean V39 12 m/s % of Events SD m/s 500 kW 1 MW 1.5 MW 1st SD 68% 0.06 0.72 2nd SD 95% 0.12 1.44 3rd SD 99.7% 0.18 2.16 150 kw 300 kW 450 kW Wind Reserve Impact on Run Time 20500 21000 21500 22000 22500 23000 23500 24000 24500 0 20 40 60 80 100 120Diesel Run Time (Hr/yr)Wind Reserve % Impact of Wind Reserve on Diesel Run Time ""3-EWT""2-EWT "1-EWT" Wind Reserve is portion of wind output NOT counted as Capacity for dispatch purposes 2,700,000 2,800,000 2,900,000 3,000,000 3,100,000 3,200,000 3,300,000 3,400,000 3,500,000 0 20 40 60 80 100 120 Wind Reserve % Impact of Wind Reserve vs Fuel Consumption 1-EWT Gallons 2-EWT Gallons 3-EWT Gallons Fuel Consumption No Wind Turbines Value of Heat in Bethel •Value of Heat Fuel Oil Electricity Resistive Heat Pump BTU/gallon 138,700 COP=3 BTU/kwh 3413 10239 Heating Eff 85% 100% 100% Cost $6 $0.10 $0.10 gallon kwh kwh Value $/Therm $5.09 $2.93 $0.98 Therm=100,000 BTUs BEU Price in 2009 was $2.50/Therm 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 0 0.9 1.8 2.7 3.6 4.5 5.4 6.3Thermal Energy kWh/yrWind Farm Size MW Thermal Energy Demand - Current Estimate Excess Boiler Diesel Wind 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 0 0.9 1.8 2.7 3.6 4.5 5.4 6.3Thermal Energy kWh/yrWind Farm Capacity MW Thermal Energy Demand at 2X Excess Boiler Diesel Wind City Site Wind Farm Example KYUK Site KYUK Site Met Tower Siting BEU Distribution Limitations •Current distribution system has limited ability to absorb distributed generation assets. –Voltage •3 Feeders at 2,400 Delta •4 Feeders at 7,200 Delta –Overhead Distribution •A few short section of underground distribution –Plant operates at +4% over voltage (2,500 v) BEU Distribution Circuit Voltage Transformer kVA, %Z Typ. Min kW (note 1) Typ. Max kW (note 2) Dist. Line to Wind Farm Location (note 3) #1 – City Subdivision 2400V --- 410kW 1015kW #2 – ASHA Housing 2400V --- 390kW 875kW #3 – Airport / BIA 7200V 1500kVA, 3.9%Z 305kW 725kW #4 – Hospital 2400V --- 300kW 1020kW #5 – Downtown Slough 7200V 1500kVA, 3.5%Z 325kW 715kW #6 – Tundra Ridge / Ptarmigan 7200V 1500kVA, 5.5%Z 405kW 1350kW 1.5 miles MERLIN, 0.75 miles QUAIL #7 – Airport 7200V 1500kVA, 5.13%Z 475kW 1160kW 1.5 miles MERLIN, 2.0 miles QUAIL BEU Distribution Preliminary Analysis •3 Sets of Graphs with Max/Min Feeder Loads –Feeder #6 – City Wind Farm –Feeder #7 – KYUK Wind Farm •Each Set has 1.0 and 0.97 PF from Wind Plant •1st Set: Voltage and Line Loss •2nd Set: Line and Transformer Limits •3rd Set: Power Plant Limits KYUK Site Feeder