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ID:39061755
大小:418.00 KB
页数:10页
时间:2019-06-24
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1、滨州学院本(专)科毕业设计(外文翻译)毕业设计(外文翻译)题目在电网电压不平衡条件下的动态建模和风力涡轮机的直接功率控制系(院)自动化系专业电气工程与自动化学生姓名刘斌学号2007090124指导教师何芳职称助教2011年3月8日1滨州学院本(专)科毕业设计(外文翻译)DynamicmodelinganddirectpowercontrolofwindturbinedrivenDFIGunderunbalancednetworkvoltageconditionAbstract:Thispaperproposesananalysisandadirectpowercontrol(DPC)desig
2、nofawindturbinedrivendoubly-fedinductiongenerator(DFIG)underunbalancednetworkvoltageconditions.ADFIGmodeldescribedinthepositiveandnegativesynchronousreferenceframesispresented.Variationsofthestatoroutputactiveandreactivepowersarefullydeducedinthepresenceofnegativesequencesupplyvoltageandrotorflux.An
3、enhancedDPCschemeisproposedtoeliminatestatoractivepoweroscillationduringnetworkunbalance.Theproposedcontrolschemeremovesrotorcurrentregulatorsandthedecompositionprocessingofpositiveandnegativesequencerotorcurrents.SimulationresultsusingPSCAD/EMTDCarepresentedona2-MWDFIGwindpowergenerationsystemtoval
4、idatethefeasibilityoftheproposedcontrolschemeunderbalancedandunbalancednetworkconditions.Keywords:Doubly-fedinductiongenerator(DFIG)Windturbine,Directpowercontrol(DPC),Statorvoltageoriented(SVO),UnbalancednetworkINTRODUCTION,Windfarmsbasedonthedoubly-fedinductiongenerators(DFIG)withconvertersratedat
5、25%~30%ofthegeneratorratingforagivenrotorspeedvariationrangeof±25%arebecomingincreasinglypopular.Comparedwiththewindturbinesusingfixedspeedinductiongeneratorsorfully-fedsynchronousgeneratorswithfull-sizeconverterstheDFIG-basedwindturbinesoffernotonlytheadvantagesofvariablespeedoperationandfour-quadr
6、antactiveandreactivepowercapabilities,butalsolowerconvertercostandpowerlosses(Penaetal.,1996).However,bothtransmissionanddistributionnetworkscouldusuallyhavesmallsteadystateandlargetransientvoltageunbalance.IfvoltageunbalanceisnotconsideredbytheDFIGcontrolsystem,thestator1滨州学院本(专)科毕业设计(外文翻译)currentc
7、ouldbecomehighlyunbalancedevenwithasmallunbalancedstatorvoltage.Theunbalancedcurrentscreateunequalheatingonthestatorwindings,andpulsationsintheelectromagnetictorqueandstatoroutputactiveandreactivepowe
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