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Panhandle Renewable Energy Zone (PREZ) Study Preliminary Results ERCOT System Planning ERCOT CMWG 09-04-2013. Outlines. Needs and Purpose of PREZ study Generation Interconnection in Panhandle Overview Study Process Preliminary Results Observation and Discussion. Needs of PREZ Study. - PowerPoint PPT Presentation
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Panhandle Renewable Energy Zone (PREZ) Study
Preliminary Results
ERCOT System Planning
ERCOT CMWG
09-04-2013
Preliminary Results
Outlines
• Needs and Purpose of PREZ study
• Generation Interconnection in Panhandle Overview
• Study Process
• Preliminary Results
• Observation and Discussion
Preliminary Results
Needs of PREZ Study
• 2012 Long Term System Assessment– Significant expansion of wind resources in the Panhandle
under a range of future outcomes.– If the northwestern-most portion of the Panhandle CREZ
system becomes over-subscribed, voltage stability limits will constrain wind power delivery to the rest of the ERCOT system.
• Generation projects will exceed the CREZ design capacity for the Panhandle area (based on the CREZ Reactive Study “Initial Build” recommendations).
• No near-term Panhandle transmission projects being developed post CREZ 2013.
Preliminary Results
Purpose of PREZ Study
• To identify system constraints and upgrades to accommodate future wind generation projects.
• To provide a project roadmap for both ERCOT and TSPs to accommodate additional generation resources in the study area.– List of potential system upgrade projects.– Triggers for when those projects will be recommended.
Preliminary Results
Wind Projects GINR Overview
Preliminary Results
Signed Generation Interconnection Agreements in Panhandle (3489 MW as of July, 2013)
Preliminary Results
*With financial commitment** Projected commercial operation date
GINR ProjectName CountyCapacity
(MW) COD**
13INR0059 Hereford Wind Castro 499 10/1/2013
14INR0012 Miami Wind 1 Project Gray 401 5/1/2014
13INR0048* Spinning Spur Wind Two Oldham 161 6/1/2014
14INR0030a2* Panhandle Wind Carson 218 8/1/2014
11INR0050 Moore Wind 1 Crosby 149 8/8/2014
13INR0010a Mariah Wind Parmer 200 10/30/2014
14INR0023 Longhorn Energy Center Briscoe 361 12/1/2014
13INR0005* Conway Wind Farm Carson 600 12/15/2014
13INR0010b Mariah Wind Parmer 200 12/31/2015
12INR0029 Comanche Run Wind Swisher 500 12/31/2015
13INR0010c Mariah Wind Parmer 200 12/31/2016
Panhandle Grid Characteristics
• Minimal/no local load• Minimal/no sync
generation• 11 GW wind capacity in
GINR
• Voltage stability and grid strength challenges
Preliminary Results
GrayAlibates
Windmill
OgallalaTule Canyon
Cottonwood
41.5 miles
92.9 miles
66.36 miles
65.8 miles
26.53 miles
46.58 miles
Initial Build (2400 MW)
400400
761600
200
200
361600
149400
0
Preliminary Results
Study Process
• Reliability Analysis– Steady state and dynamic stability analysis– SSWG 2016 HWLL base case
• 8,946MW wind output, 36.5GW load• 0 MW in Panhandle
– Two scenarios• 5,000 MW wind output in Panhandle• 7,500 MW wind output in Panhandle
• Economic Analysis– 2017 UPLAN case from 2012 Five-Year Transmission Plan
Preliminary Results
Current Panhandle Design – 2,400 MW
Cotton Wood
Tule Canyon
Tesla
DermottLong Draw
Windmill
AlibatesGray
Preliminary Results
Ogallala
Scenario 1 Upgrades - 5 GW PREZ
Cotton Wood
Ogallala Tule Canyon
Windmill – Ogallala (1ckt, 27miles)Windmill – Alibates (1ckt, 93miles)Ogallala – Tule Canyon (1ckt, 47miles)Ogallala - Long Draw(2ckt, 200 miles)Condenser: WM (350 MVAr), OG (350 MVAr)Reactors: TC(150MVAr), OG(150MVAr), LD(100MVAr)
Tesla
DermottLong Draw
Windmill
AlibatesGray
Preliminary Results
Scenario 2 Upgrades - 7.5 GW PREZ: Option 1
Cotton Wood
Ogallala Tule Canyon
345 kV projectsWindmill – Ogallala (1ckt, 27miles)Windmill – Alibates (1ckt, 93miles)Ogallala – Tule Canyon (1ckt, 47miles)Condenser: WM , OG 345/500 kV projectsOgallala - Long Draw (2ckts, 200 miles)Gray-Riley(2ckts, 175 miles)Windmill-EdithClarke (2ckts, 175 miles)
Tesla
DermottLong Draw
Windmill
AlibatesGray
Preliminary Results
Riley
Edith Clarke
Graham
W. Shackelford
Study Progress
5,000 MW0 MW 7,500 MW
SC1SC1 SC2SC2IAIA
3,489 MW
345/500 kV projects• Gray-Riley 2ckts• Windmill-EdithClarke 2ckts
345/500 kV projects• Gray-Riley 2ckts• Windmill-EdithClarke 2ckts
In ServiceIn Service Signed Interconnection Agreement
Signed Interconnection Agreement
• Alibates-Windmill (345kV)• Windmill-Ogallala(345kV)• Ogallala-TuleCanyon(345kV)• Ogallala-LongDraw 2ckts• Synchronous Condensers and
Reactors
• Alibates-Windmill (345kV)• Windmill-Ogallala(345kV)• Ogallala-TuleCanyon(345kV)• Ogallala-LongDraw 2ckts• Synchronous Condensers and
Reactors
TBDTBD
CREZCREZ
CREZCREZ
2,400 MW
Preliminary Results
Notes
• PREZ study focuses on the upgrade needs to increase Panhandle export capability. Other ERCOT regions may require further studies for potential thermal and stability challenges.
• The identified upgrades may be revised base on the actual implementation of wind projects in Panhandle.
• The upgrades identified in this study may still require RPG review.
Preliminary Results
Upgrades for PREZ
PanhandleLoad: 0MWWind: 7.5GWSG: 0MW
PanhandleLoad: 0MWWind: 7.5GWSG: 0MW
West Texas**Load: 2.9GWWind: 7.6GWSG*: 2.7GW
Existing link
Identified Panhandle Upgrades
Stability Constraint:•Voltage stability•Weak link•Low short circuit ratio•Controller challenge
*Include Comanche Peak units** not include Panhandle
Preliminary Results
Upgrades for West Texas wind generation
PanhandleLoad: 0MWWind: 7.5GWSG: 0MW
PanhandleLoad: 0MWWind: 7.5GWSG: 0MW
West Texas**Load: 2.9GWWind: 7.6GWSG*: 2.7GW
Existing link
Identified Panhandle Upgrades
ERCOTLoad Centers
Further Upgrades?
Stability Constraint:•Voltage stability•Low short circuit ratio•Voltage support for transfer
*Include Comanche Peak units** not include Panhandle
Preliminary Results
Study Observation – Voltage Ride Through
• Weak network conditions can cause transient overvoltage• Based on the modeled wind farms in the study, 973 MW
wind capacity tripped due to transient overvoltage.– More capacity can be tripped that can even lead to high voltage
collapse in the entire Panhandle area if wind farms are equipped with less voltage ride through capability.
Panhandle 345kV Bus Voltage Response
High Voltage Ride Through (HVRT): NOGRR 124
• Add HVRT base on PRC-024 (Adopted by the NERC Board of Trustees on May 9, 2013)
• No change to the low voltage ride through requirement in Operating Guide 2.9.1