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电力系统自动化 2012
Analysis of Short-circuit Characteristics and Calculation ofSteady-state Short-circuit Current for DFIG Wind TurbineKeywords: wind,power,generation,doubly-fed,induction,generator（DFIG）,short-circuit,current,transientcharacteristics Abstract: Large-scaledoubly-fedinductiongenerator（DFIG）windturbinesareconnectedtothegridandrequiredtoremaingrid-connectionduringfaults，theshort-circuitcurrentcontributedbythegenerationhasbecomeasignificantissue.However，thetraditionalcalculationmethodsaimingatsynchronousgeneratorscannotbedirectlyappliedtotheDFIGwindturbines.Anewmethodisneededtocalculatetheshort-circuitcurrentrequiredbytheplanning，protectionandcontrolofthepowergrid.Theshort-circuittransitionofDFIGundersymmetricalandasymmetricshort-circuitconditionsaremathematicallydeduced，andtheshort-circuitcharacteristicsofDFIGareanalyzed.Anewmethodisproposedtocalculatethesteady-stateshort-circuitcurrentofDFIGbasedonthederivedexpressions.Thetime-domainsimulationsareconductedtoverifytheaccuracyoftheproposedmethod.
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