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Published byPeregrine McLaughlin Modified over 8 years ago
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Modelling the NPCC System with 12.5% Wind Penetration
Christopher Matthews Undergraduate Researcher Summer REU July 22, 2015 Knoxville, TN
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What is a Balancing Authority?
Traditional AGC Corrects deviations from scheduled system frequency and scheduled tie line exchanges Each area has a balancing authority What is a Balancing Authority?
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Area Control Error π΄πΆπΈ= βπ πππ +π΅βπ Damping factor is negligible
π΅= 1 π
+π· π
= βπ β π πΊππ Damping factor is negligible ACE should cross zero at least once every 10 minutes MISO Energy ACE Graph π πππ : Tie-line power π: System Frequency π΅: Frequency bias factor π
: Speed regulation factor π·: Damping factor π πΊππ : Generated power
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Doubly-Fed Induction Wind Generator
Most common type of wind generator Asynchronous generation Requires more control than traditional generators Added controls adjust power output to maximum
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Inertial Response Comes from kinetic energy in rotating masses
First few seconds of response Determines magnitude of frequency excursions Hidden in variable speed wind turbines
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User Defined Models using DSATools UDM
Regulating Unit DFIG
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Verifying Models Show correct frequency regulation
Tie line flow returns to scheduled with frequency
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Illustrate effect of losing system inertia
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AGC Response with Variable Wind
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Future Work Immediate Response Emulated inertia Droop control
Long Term Deloading control Pitch control Rotational speed control
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Acknowledgements This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award Number EEC Other US government and industrial sponsors of CURENT research are also gratefully acknowledged.
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