Loading...
HomeMy WebLinkAboutSouthcentral Railbelt Transmission RIRP Draft Results February 24, 2012Southcentral Railbelt Transmission RIRP Draft Results By Electric Power Systems,Inc. February 24,2012 Introduction RIRP (Railbelt Integrated Resource Plan)Update -RIRP completed in 2010 -Outlined transmission required to support RIRP generation RIRP Update -Determine transmission required to support current generation plans -Power Flow/Transient Stability Studies -Power system configuration options aN ;(¥gy >,Cleat Power S ystems |he Y)Consulting Engineers Slide 2 SYSTEMSoh -RIRP Update -Drivers -Changed Capital &Operating Conditions -Chugach thermal generation additions -AML&P Generation Changes -Matanuska Generation Changes -Matanuska Transmission Changes -AEA Large Hydro Selection Consulting Engineers Slide 3 Transmission Operations Power transfer limited by: -Thermal Limits Stability Limits In Southcentral system,most limits are thermal limits Clectric Power Systemsinc, Consulting Engineers Slide 4 Study Assumptions Chugach's SPP 202 MW winter,157 MW summer AML&P Pit 2 115 MW winter,93 MW summer MEA generation 170 MW MEA Reed (Eklutna 2)-Hospital 115 kV line MEA Reed -Hospital-Herning 115 kV line Chugach SPP -AML&P Sub 23 115 kV line Watana -600 MW 2025 IOC 2009 &2020 Base Cases Slide 5 -2020 Seasonal Base Case from toc Season CEA !GVEA i HEA MEA MLE SES Total wwe 223 283.3 98.7 186 219.9 11.9 1028.8 SP 159.3 224.6 67.4 116.2 210.4 10.3 788.2 sv 938.3 L2ay.a AS.F 67.5 113.1 7.7 459.7 RIRP Winter Peak Loads Year CEA |GVEA HEA MEA MLEP SES GRETC 2011 161 isl 75 >167 LO 668 2015 161 irs FF 36:oon 121 667 2020 163 182 79 95 17S tn 689 2025 166 18s)83 1900 180 21 713 2030 a7o 135 86 106 1Be2 Et 727 2035 173 202,30 213 189 21 762 2020 176 209°33 119 193 aL 7S7 2045 1s0 216 oF 126 198 42 813 2050 183 22a LOW 23a 202 22 839 2055 186 231 tot Bad 207 12 866 2060 190 239 10s 149 212 13 894 RIRP Summer Valley Loads Year CEA GVEA HEA MEA ML&P SES GRETC 2012 95 _sf 44 530 91 4 414 2015 -96 si.46 Ss?33 Ss 414 2020 37 sa A?61 35 5 427 2025°339 SF 4a 65 33 s AAL 2030 on 1°a 'sl 6o too 5 456 2035 203 'of |52 -3 103 5 471 2080 105°oF 55 TF?105 Ss 486 2045 mor:100 SF Sl 108 Ss 502 2050 109 |10 60 85 110 5 518 2055 Liz LO?i 620 90 113 Ss 534 2060 1413 Lit 6a 95 115 5 551 RIRP Summer Peak Loads Year CEA !GVEA HEA WEA MLEP SES GRETC 232 238 BF 1246 188 10 869 235 _213 ss 157 192 £0 868 238 -226 92 167 197 20 S96 242 ©234 36 178 202 10 928 247 (243 -100 188 207 20 959 252 252 _2 ass 212 to 991 256°260 108)210°217 10 1024 261 263 a2 222 223 20 1058 266 278 aay 234 $228 2106 1092 272 23838 222 247 @&233 20 112? 276 297 125 260 229 10 1163 Base Case Studies Following completion of new generation and transmission improvements:. No thermal overloads during normal conditions Excessive voltage during light summer conditions Requires at least 40 MVAr of reactors prior to starting RIRP studies 40 MVAr likely required to be SVC or 4 -10 MVAr reactors Other issues may be identified in operating studies Slide 7ConsultingEngineers Pre-Watana Period 2025 Loss of Teeland -MacKenzie 230 kV line Most severe event in Raibelt Low voltages/overloads in MEA system No power transfer over Anchorage -Fairbanks Intertie Eklutna -AML&P Pit 2 115 kV outage Outage severe due to slow clearing times Tap faults result in loss of main transmission line aYe\,Sect Power SystemshyAConsultingEngineers 'SYSTEMSa Slide 8 Transmission Solutions - "=Pre Watana The following transmission improvements were evaluated Lake Lorraine Substation Lorraine -Douglas 230 kV line Fossil Creek 230 kV station Fossil Creek 115 kV station Raptor -Fossil Creek 115 kV line Electric Power Ss ystemsinc. Consulting Engineers Slide 9 Study Results -Pre Watana -Douglas -Lorraine 230 kV line/Lorraine Sub Eliminates the 50 miles of single contingency to Fbks on the Intertie Eliminates 26 miles of single contingency for MEA to Teeland Provides location for reactive compensation for Southcentral Includes 230/115 kV transformer at Douglas -Fossil Creek Substation Install 115 kV station at Fossil Creek Station configuration s/b breaker-half Line terminations »Briggs °Plant 2 -Reed/Eklutna 2 'Reed/Eklutna 2 =Raptor 230 kV Fossil Creek not required EClectric Power Systems Consulting Engineers Slide 10 Study Results -Pre Watana -Eklutna Station 115 kV ring bus - 230 kV not required Connections to: «Reed/Eklutna 2 «Reed/Eklutna 2 Electric Power S ystems Consulting Engineers Slide 11 Study Results -Post-Watana -Lorraine -Douglas 230 kV line outage System goes unstable following loss of this line -Teeland -Herning line outage 230 kV Lorraine -Fossil Creek line overloads in summer temps -Lorraine -Fossil Creek outage Teeland -Herning overloads following loss of 230 kV cables a '(9g %,Cecti Power SystemsheyyConsultingEngineers SYSTEMS , Slide 12 Transmission Solutions The following transmission improvements were evaluated: Additional Lorraine -Douglas 230 kV line Reconductoring Lorraine -Douglas 230 kV Reconductoring 115 kV Teeland -Herning Fossil Creek 230 kV station/230 kV line conversion Lorraine -Fossil Creek 230 kV line/cables Reconductor OH Lorraine -Fossil Creek 230 kV Douglas -Hospital Line 230 kV Douglas -Hospital -Reed/Eklutna2 | Clectric Power Systemsinc, Consulting Engineers Slide 13 Transmission Solutions The following transmission improvements were evaluated: 230 kV Douglas -Hospital -Reed/Eklutna2 - Fossil Creek line 230 kV Douglas -Pt Mackenzie Line 230 kV/138 kV Pt MacKenzie transformer 230 kV AMLP Pit 2 -University Line New Kenai Intertie Third 230 kV OH/Cable line Douglas -Lorraine -Fossil Creek Slide 14 Generation Solutions The following generation changes were evaluated to alleviate the thermal overloads following N-1: Reduce Watana/Increase Bradley Reduce Watana/Increase SPP Reduce Watana/Increase AML&P Reduce Watana/Increase MEA Consulting Enginee Slide 15 3S PTEERY f,we-EaaieRateoete:+.FALwewepdtle,,a iver a aor {"a 1M y ad i a :fie a"98 Ds MF aa is Me pon bf Slide 16 Je aks J Ya eeeIEMieNTTSOAeed Alternative Analysis -Transient Either Douglas -Lorraine 230 kV or Douglas - Hospital -Fossil Creek 230 kV is required to alleviate stability collapse Douglas -Lorraine dble ckt incremental cost -$11,800,000 Douglas -Hospital -Fossil Creek 230 kV line plus stations -$131,250,000 Alectric Power Systems Consulting Engineers Slide 17 Alternative Analysis -Thermal Douglas -Hospital -Fossil Creek 230 kV line plus stations -$131,250,000 Increase conductor size Lorraine -Douglas -$12,000,000 Fossil Creek 230 kV station -$12,500,000 AML&P Plant 2 230 kV Bay -$1,900,000 Slide 18 Alternative Analysis -ThermalC Douglas -Hospital 230 kV line plus stations -$82,000,000 Increase conductor -Lorraine -Fossil Creek $42,000,000 Reconductor Teeland -Herning -$12,000,000 Fossil Creek 230 KV station-$12,500,000 -AML&P Plant 2 230 kV Bay -$1,900,000 Slide 19 Alternative Analysis -Thermal Lorraine -Fossil Creek 230 kV line/cable -$67,400,000 Increase conductor -Teeland -Herning $12,000,000 Increase conductor Lorraine -Douglas -$12,000,000 Fossil Creek 230 kV station -$12,500,000 -AML&P Plant 2 230 kV Bay -$1,900,000 Le Electric Power Systems Consulting Engineers Slide 20 Alternative Analysis -Thermal Douglas -Lorraine -Fossil Creek 230 kV OH line/Cable plus station improvements -$110,414,000 Fossil Creek 230 kV station .$12,500,000 -AML&P Plant 2 230 kV Bay -$1,900,000 gr EClectric Power Systems A.Consulting Engineers Slide 21 SYSTEMS-* __._.Alternative Analysis -Generation -The transmission overloads can be eliminated by reducing Watana output (Starting at 600 MW).The amount of Southcentral import reduction by season is as follows: -Winter -0 MW -Summer Peak -220 to 270 MW -This assumes a minimum amount of upgrades are completed.Fossil Creek 230 kV Sub, Slide 22 Alternative Analysis - one Co mbinationThetransmission overloads can be eliminated by reducing Watana imports in combination with key imports as follows: Increase Lorraine -Douglas line to bundled conductor _$12,000 .Winter -0 MW -Summer Peak -150 to 225 MW Slide 23 __Pre-Watana | Project Description Cost Fossil Creek 115 kV Breaker-and-half station at Fossil Creek |$12,800.00 'Raptor-Fossil Creek line 115 kV 954 line to Raptor §6,500.00 Eklutna 115 kV station 115 kV Ring Bus S$8,000.00 Lorraine Substation 230 breaker-and-half station S$19,600.00 Douglas 230 kV Station Add 230/115 kV station at Douglas $20,200.00 Lorraine -Douglas line Double Circuit 230 kV line S$46,700.00 S40 RMIVAr SVC addition Add 40 MVAr SVC to Lorraine S$14,000.00 Total Pre-Watana $127,800.00 Clectric Power Systems45inc,Y Consulting Engineers= Slide 24 Post Watana 'Douglas-Lorraine DbleCkt =includedin pre-Watana above ee Option 1 eS Douglas-Hospital-Fossil 230 kV 230 kV Land Line Dougtas-Fossil Creek $131,250 Fossil Creek 230 kV station Add 230 kV Fossil Creek Station S 12,500 AML&P 230 kV Bay Add 230 kV Bay at Plant 2 S 1,900 Bundle conductor Lorraine-Douglas |add second 954 conductor $12,000 Total Option 1 §157,650 Option 2 'Douglas-Hospital 230 kV line Douglas -Hospital S$82,000 Bundle conductor Lorraine-Douglas |add second 954 conductor $12,000 'Fossil Creek 230 kV station Add 230 kV Fossil Creek Station S 12,500 "AMILEP 230 kV Bay Add 230 kV Bay at Plant 2 S 1,900 'Teeland -Herning reconductor rebuild line to 954 $12,000 'Total Option 2 $120,400 Option 3 'Lorraine -Fossil Creek 230kVline |Add 230kV OH/Cable from Lorraine-FC |$67,400 Bundle conductor Lorraine-Douglas {add second 954 conductor S$12,000 Fossil Creek 230 kV station Add 230 kV Fossil Creek Station S$12,500 AMILE&EP 230 kV Bay Add 230 kV Bay at Plant 2 S 1,900 'Teeland -Herning reconductor rebuild line to 954 $12,000 'Total Option 3 §105,800 'Option4 Fossil Creek 230 kV station Add 230 kV Fossil Creek Station S 12,500 'AML&P 230 kV Bay Add 230 kV Bay at Plant 2 $1,900 'Douglas-Lorraine-Fossil Creek line {Add new OH/Cable line S 110,414 §124,814.'Total Option 4ClectricPowerSystems inc,. Consulting Engineers Slide 25 Conclusions Planning for the Southcentral system is radically different and more complex with current generation plans Generation locations at AML&P/Chugach and MEA present different stress locations on the transmission system Discrepancies between RIRP and IOC loads should be resolved.These are critical in the Southcentral areas The 40 MVAr reactive improvements are critical | and must be completed the summer prior to the MEA generation RY,Glectc Power Sisters&p Sy Consulting Engineers Slide 26 SYSTEMS 7am Conclusions The Lorraine -Douglas line is critical to the reliability and capability of the system The Eklutna -Fossil Creek line section provides considerable improvement in voltage and reliability improvements and should be terminated Or Clectric Power SystemsSprConsultingEngineersms | . Slide 27SEN Conclusions The planning criteria for the Railbelt is critical in the development of the post-Watana system Summer peak ratings of OH lines are the most critical item in transmission planning. Consideration should be given to developing normal/overload/emergency ratings in planning to correspond to Normal,N-1 and N-1+ conditions The evaluation of capital projects vs re-dispatch is a Critical decision in Raibelt planning Slide 28 Conclusions Redispatch following an N-1 contingency post- Watana can defer over $100M worth of capital expenditures Redispatch between Watana and Southcentral will increase likely increase this deferral by $2- $300M Slide 29 Recommendations Finalize Southcentral generation and dispatch plans post-Watana Continue to develop cost estimates and alternatives Develop a comprehensive Railbelt Transmission Plan Slide 30