ERCOT Staff Facilitator Juan S. Santos Senior Consultant, System Planning Technical Operations
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ERCOT Staff Facilitator
Juan S. Santos
Senior Consultant, System Planning Technical Operations
jsantos@ercot.com
WIND GENERATION STABILITY MODELING TASK FORCE
UPDATE FOR ROS
APRIL 9, 2002
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 !
GENERATOR OUTPUT AND WIND SPEED
TYPES OF STABILITY STUDIES
Small Signal Stability
Power System Stability
Angle Stability Frequency Stability Voltage Stability
Transient StabilityLarge DisturbanceVoltage Stability
Small DisturbanceVoltage Stability
Short Term Short TermLong Term Long Term
Small Signal StabilitySmall Signal
Stability
Power System StabilityPower System Stability
Angle StabilityAngle Stability Frequency StabilityFrequency Stability Voltage StabilityVoltage Stability
Transient StabilityTransient StabilityLarge DisturbanceVoltage Stability
Large DisturbanceVoltage Stability
Small DisturbanceVoltage Stability
Small DisturbanceVoltage Stability
Short TermShort Term Short TermShort TermLong TermLong Term Long TermLong Term
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
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
COST SHARINGInvoices Sent Out 02/26/02
COMPANY SITE NAMESIZE (MW)
% OF COST
RECD
Cielo Wind Capital Hill 100 8.9%
Trent Wind Farm, LP Trent Wind Farm 150 13.3%
Indian Mesa Power Partners LP Enron Indian Mesa I & II 160 14.2%
FPL Energy Pecos Wind Woodward Mt. Wind Ranch 160 14.2%
FPL Energy Upton Wind I King Mt. Wind Ranch 79.3 7.0%
FPL Energy Upton Wind II King Mt. Wind Ranch 79.3 7.0%
FPL Energy Upton Wind III King Mt. Wind Ranch 79.3 7.0%
FPL Energy Upton Wind IV King Mt. Wind Ranch 40.3 3.6%
NWP Indian Mesa Wind Farm, LP
Indian Mesa Wind Farm 82.5 7.3%
AEP-WTU Fort Davis 1 6 0.5%
FPL Energy Mesa Wind 1 (SW Mesa) 74.6 6.6%
Delaware Mountain Wind Farm, LP
Delaware Mountain Wind Farm 1
30 2.7%
New World Texas Renewable Energy
Big Spring Wind power Facility& Westex I Wind power
40.92 3.6%
Wind Power Partners, LP Kunitz 1 44.8 4.0%
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
DRAFT TIME TABLE M J J A S O N D J F M A M
Funding
XX XX
Contractor Starts
XX XX XX XX
Mid-point
XX XX
Completion
XX XX XX XX
Ready to use in PTI
PSSE XX XX
Install equipment
XX XX XX
Collecting Data
XX XX XX XX XX XX XX XX
Tuning
XX XX
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