a new subsynchronous oscillation (sso) relay for renewable...
TRANSCRIPT
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A New Subsynchronous Oscillation (SSO) Relay For
Renewable Generation And Series Compensated
Transmission Systems
By: Yanfeng Gong, Yiyan Xue, Ben Mehraban
American Electric Power(AEP)
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Texas Competitive Renewable Energy
Zones (CREZ)
• Public Utility Commission(PUC)
of Texas issued order 33672
designating five CREZs for wind
power generation
• Transmit 18,456 (MW) of wind
power from West Texas and
Panhandle
• With total capital investment over
9 billion $
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Series Compensated Transmission Line
Increase Power Transfer
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Power System Resonant Frequencies
with Series Capacitor Banks
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• Sub-Synchronous Resonance (SSR)
• Synchronous generator shaft torsional modes in the same
frequency range as the sub-synchronous modes of the
network (1970 Mohave generator station)
• Sub-Synchronous Control Instability (SSCI)
• Interaction of power electronics control systems (wind farm,
SVC, FACTS, HVDC) with sub-synchronous modes of the
network (2009 Texas)
Sub-Synchronous Oscillation (SSO)
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Wind Generation with Series
Compensated Lines Prone to SSCI
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Sub-Synchronous Control Interaction
(SSCI)
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Power System Currents and Voltages
Under SSCI Conditions
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MOV Conducting Under SSCI Conditions
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Spectrum Analysis of Currents and
Voltages
Currents
Voltages
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Traditional Protective Relay Signal
Processing Targeting 60Hz Signal
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SSO Relay Signal Processing Targeting
Subsynchronous Component
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Special Filter Effectively Extract
Subsynchronous Component
Currents
Voltages
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Protection Logic with Reliability and
Security
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SSO Relay Hardware Platform
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Hardware-In-The-Loop Test of SSO Relay
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SSO Deployment
• First unit was commissioned at October 8th at Matador
substation in Texas
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SSO Deployment Guidance
• All generation point of interconnection (POI) if
generator has an SSO issue for any contingency
between N-1 and N-6
• All wind and solar facilities at the POI if there is a
short circuit ratio issues. This will be based on the
wind turbine or solar converter data from the
manufacturer
• All HVDC, STATCOM, and SVC locations if the studies
determined that there is an SSO issue
• Series capacitor banks if SSO issues have been found
for any generator that is impacted by the series
capacitor banks
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Thank You