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ERCOT Staff Facilitator Juan S. Santos Senior Consultant, System Planning Technical Operations

WIND GENERATION STABILITY MODELING TASK FORCE UPDATE FOR ROS APRIL 9, 2002. ERCOT Staff Facilitator Juan S. Santos Senior Consultant, System Planning Technical Operations jsantos@ercot.com. MOTIVATION. Large number of new wind plants in West Texas 1000+ MW & Growing

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ERCOT Staff Facilitator Juan S. Santos Senior Consultant, System Planning Technical Operations

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  1. WIND GENERATION STABILITY MODELING TASK FORCE UPDATE FOR ROS APRIL 9, 2002 ERCOT Staff Facilitator Juan S. Santos Senior Consultant, System Planning Technical Operations jsantos@ercot.com

  2. MOTIVATION • Large number of new wind plants in West Texas • 1000+ MW & Growing • West Texas already is transmission limited • Primary is stability limit • Secondary is thermal limits • Accurate and Appropriate models development is necessary to support transmission planning and operational studies. • Model development does have a cost • Share the costs • More Wind Generation Development is likely !

  3. GENERATOR OUTPUT AND WIND SPEED

  4. Power System Stability Power System Stability Power System Stability Frequency Stability Voltage Stability Voltage Stability Angle Stability Angle Stability Frequency Stability Voltage Stability Angle Stability Frequency Stability Small Signal Stability Large Disturbance Large Disturbance Small Disturbance Small Disturbance Small Signal Stability Transient Stability Transient Stability Voltage Stability Voltage Stability Voltage Stability Voltage Stability Large Disturbance Small Disturbance Small Signal Stability Transient Stability Voltage Stability Voltage Stability Short Term Short Term Long Term Long Term Long Term Long Term Short Term Short Term Short Term Long Term Long Term Short Term TYPES OF STABILITY STUDIES

  5. MODELING REQUIREMENTS • Control Block Diagrams • Transmission interconnection point “aggregated” wind farm model. • Incorporated in the PTI PSSE program and model library. • For use by ERCOT Staff, TSP’s & Stakeholders • Validation that the numerical model responds the same as the “real world”. • Monitoring & Testing • Flexible Model with ability to incorporate “local” time and seasonal factors • Stochastic Nature of Wind • Account for both Real and Reactive power under steady state and dynamic studies • Translation into PTI – Source Code

  6. ADDITIONAL MODELING REQUIREMENTS • Electro-mechanical interaction between turbines in “wind farms” that are near and with different set points excited by disturbances in power grid? • Soft shafts and different control set points • pitch control, variable speed, voltage control etc… • Effects of weak system (low X/R ratio) • Periodic pulsations due to wind shear, wind speed and turbulence • Model voltage, transient and subtransient stability phenomenon

  7. COST SHARINGInvoices Sent Out 02/26/02

  8. VERY ROUGH COST ESTIMATE • Model Development $125,000 to $200,000 • Travel/Meetings $10, 000 to $20,000 • Validation /Testing $50,000 to $80,000 (?) • Data Research $20,000 to $30,000 (?) • Monitoring Equipment $20,000 to $30,000 (?) • Totals estimated at $225,000 to $360,000

  9. DRAFT TIME TABLE

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