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时间:2020-04-02
《电力电子技术专业翻译.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、本科毕业设计(论文)中英文翻译院(系部)电气工程与自动化学院专业名称电气工程及其自动化年级班级 学生姓名 学号指导老师2012年6月8日1PowerElectronicConceptsPowerelectronicsisarapidlydevelopingtechnology.Componentsarettinghighercurrentandvoltageratings,thepowerlossesdecreaseandthedevicesbecomemorereliable.Thedevices
2、arealsoveryeasytocontrolwithamegascalepoweramplification.Thepricesarestillgoingdownpr.kVAandpowerconvertersarebecomingattractiveasameantoimprovetheperformanceofawindturbine.Thischapterwilldiscussthestandardpowerconvertertopologiesfromthesimplestconvert
3、ersforstartinguptheturbinetoadvancedpowerconvertertopologies,wherethewholepowerisflowingthroughtheconverter.Further,differentparksolutionsusingpowerelectronicsarealsodiscussed.1.1CriteriaforconceptevaluationThemostcommontopologiesareselectedanddiscusse
4、dinrespecttoadvantagesanddrawbacks.Veryadvancedpowerconverters,wheremanyextradevicesarenecessaryinordertogetaproperoperation,areomitted.1.2PowerconvertersManydifferentpowerconverterscanbeusedinwindturbineapplications.Inthecaseofusinganinductiongenerato
5、r,thepowerconverterhastoconvertfromafixedvoltageandfrequencytoavariablevoltageandfrequency.Thismaybeimplementedinmanydifferentways,asitwillbeseeninthenextsection.Othergeneratortypescandemandothercomplexprotection.However,themostusedtopologysofarisasoft
6、-starter,whichisusedduringstartupinordertolimitthein-rushcurrentandtherebyreducethedisturbancestothegrid.1.2.1SoftstarterThesoftstarterisapowerconverter,whichhasbeenintroducedtofixedspeedwindturbinestoreducethetransientcurrentduringconnectionordisconne
7、ctionofthegeneratortothegrid.Whenthegeneratorspeedexceedsthesynchronousspeed,thesoft-starterisconnected.Usingfiringanglecontrolofthethyristorsinthesoftstarterthegeneratorissmoothlyconnectedtothegridoverapredefinednumberofgridperiods.Anexampleofconnecti
8、ondiagramforthesoftstarterwithageneratorispresentedinFigure1.Figure1.Connectiondiagramofsoftstarterwithgenerators.Thecommutatingdevicesaretwothyristorsforeachphase.Theseareconnectedinanti-parallel.Therelationshipbetweenthefiringangle(﹤)
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