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Second Wind Generation Workshop Sand Bluff Wind Farm – Gamesa G87 Turbine John Franklin,

Second Wind Generation Workshop Sand Bluff Wind Farm – Gamesa G87 Turbine John Franklin, Vice President, Operations, E.ON Climate & Renewables North America August 22 , 2008. Gamesa G87 Wind Turbine. Physical Characteristics – Three blade, upwind design Pitch regulated variable speed

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Second Wind Generation Workshop Sand Bluff Wind Farm – Gamesa G87 Turbine John Franklin,

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  1. Second Wind Generation Workshop Sand Bluff Wind Farm – Gamesa G87 Turbine John Franklin, Vice President, Operations, E.ON Climate & Renewables North America August 22, 2008

  2. Gamesa G87 Wind Turbine • Physical Characteristics – • Three blade, upwind design • Pitch regulated variable speed • Active yaw • 78 M Hub Height • 42.5 M Blade length • 9.0 – 19.0 rpm • Asynchronous, 4 pole, doubly fed wound rotor generator, 690 V • Rating - 2000 kW - 60 Hz - 1500A @ 690 V Wind Farm Description Transmission /Interconnection Typical Operating Day Data/Communication Flow Turbine

  3. Gamesa G87 Wind Turbine • Starting – 4.0 m/s cut in wind speed.Turbine PLC manages blade pitch angle hydraulically for monitored wind conditions and adjusted by turbine power controller to optimize rotor speed and pitch angle for maximum power. • Controlling Power Output – SCADA set point controlled and operator adjustable. Park power output controlled by blade pitch angle down to 40% , below 40% individual turbines are shut down by the park controller to achieve park output set point. • Stopping – 25m/s cut-out wind speed, resets at 20m/s. Turbine PLCmanages the controlled stop by pitch angle adjustment and brake application. • Reactive devices as part of the turbine – Standard power factor is unity as measured at the low voltage side of the nacelle transformer at all active power ranges.Gamesa has static capacitors onboard each WTGwhich are not operator accessible. Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  4. Gamesa G87 Wind Turbine • Control – Asynchronous generator with wound rotor, slip rings, two 4 quadrant converters with IGBT switches, contactors and protection SIMPLIFIED DIAGRAM Turbine Wind Farm Description Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Interconnection Turbine

  5. Gamesa V87 LVRT Capability FERC Order 661-A Transition Period LVRT Standard compliant. - Procurement Contract executed December 2005 - Interconnect Agreement signed November 2006 - Scheduled in-service date July 2007 Vn EVENT T0 100 % 75 % Nominal Voltage 45 % 15 % 150 700 1500 3000 0 mS Time (milliseconds) Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine Slide5

  6. SAND BLUFF WIND FARM Location: Big Spring, Texas 90.0 MW 45 Gamesa G87 2.0 MW Wind Turbines 3 Land Owners Project Area: 10.5 square miles Grid Voltage 138 kV, McDonald Substation Mean Wind Speed 8.5 m/s Capacity factor (P50) 41.2% Annual MW hrs 325,000 Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  7. Site Selection Criteria = Good Wind, Transmission Access, Willing Landowners Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  8. SUBSTATION SINGLE-LINE DIAGRAM (SIMPLE) TDSP STATION GENERATOR STATION- 138kV OVERHEAD- 100 MVA GSU w LTC – 138/34.5 kV- 3 – 10 MVAR CAPACITOR BANKS Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  9. COLLECTION SYSTEM ONE LINE Overhead 34.5kV Underground 34.5kV 45 Gamesa G87-2.0Mw Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  10. Sand Bluff Power Factor at 138kV Metering Point Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  11. Sand Bluff Voltage Control at 138kV Metering Point Requested 142kV -144kV 144kV 142kV Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  12. Control Systems SCADA Control of WTG’s, Wind Farm and HMI control of substation breakers and capacitor banks. Local on site at Wind Farm Service Building Primary remote 24/7 at Austin Operations Center Back-up remote at Roscoe Emergency Operations Center Austin Operations Center 24/7 Operator attended control center Full SCADA control of all EON Wind Farms Direct line to ONCOR Operations Desk QSE to AOC communication and response meets ERCOT response time requirements for all actions - Curtailment/Release - Voltage Control - Reactive deployment - Changing control settings Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  13. Control System Location & Facilities ►E.ON 24/7 Austin Operations Center Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  14. Transmission & Interconnection Issues Special Protection Scheme (SPS) The substation is equipped with a Special Protection Scheme (SPS) to signal the wind farm to curtail generation in response to abnormal conditions on the Oncor transmission system. Loss of line either T-line section ( McDonald- Sprayberry or McDonald – Morgan Creek) initiates SPS if remaining line section rating is exceeded. SPS activation produces first level action (from T-0 to T+23 s) initiating back down of Sand Bluff WTG output to 60Mw via SCADA, second level action ( T+ 24 s) initiates trip of one Sand Bluff feeder breaker, third level action (T+28 s) trips Sand Bluff/Forest Creek 138kV bus breaker. Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  15. Data/ Communication Flow & Physical Activities (typical day) Submitting Resource Plan ▪ Done through QSE - - Present day update and day ahead Production Forecast submitted to QSE by 0830 daily. - Resource Plan submitted to ERCOT daily. Responding to Curtailment Order - QSE receives OOME instructions for next interval or immediate action - QSE relays dispatch instruction to EON 24/7 Operations Center - EON Dispatcher executes instruction Release from Curtailment Order - Same process as above Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  16. COMMUNICATIONS FLOWCHART ERCOT QSE 24/7 < 10 minutes EON 24/7 COMPLETE Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  17. Generator Information Flow ERCOT Day-Ahead: Generation Schedule for next day ERCOT Balancing Market QSE EC&R WTG 24/7 Operations Day-Ahead: Expected next day MW Output, Forecasts Day-Ahead: Confirmation of Next-day Schedules Day-Ahead: ERCOT Generator Instructions, if any Up to 2 hours in advance: Revised expected output based on nearer-time forecasts Up to 2 hours in advance: Resource Plans issued revising Day-Ahead Schedule Realtime: Real-Time SCADA output Realtime: Real-Time SCADA output Realtime: ERCOT Generator Instructions Realtime: ERCOT Generator Instructions Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  18. ERCOT-QSE-GEN COMMUNICATIONS DATA FLOW DIAGRAM(SPLIT-METERING SITE) Wind Farm Description Transmission/Interconnection Typical Operating Day Data/Communication Flow Turbine

  19. Q &A Slide19

  20. Thank You!

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