数字控制PWM逆变电源关键技术研究

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1、华中科技大学博士学位论文数字控制PWM逆变电源关键技术研究姓名：孔雪娟申请学位级别：博士专业：电气工程指导教师：康勇20051106都靠反复凑试本文也力图解决该问题对周期鉴相的基于TMS320F240全数字锁相环进行了精确建模分析提出了等效模型的参数设计方法并分析了过零检测可能出现的跳周鉴相失败问题给出了参数限定条件仿真和实验验证了模型的正确性和参数设计方法的可行性针对过零检测可能出现的多个过零点鉴相失败的问题提出了基于离散傅立叶鉴相的数字锁相环同样建立了其模型提出了参数设计方法分析了基于离散傅立叶鉴相可能出现的

2、正反馈鉴相失败问题仿真和实验验证了该鉴相方法的可行性关键词PWM逆变电源数字控制零阶保持状态观测器数字锁相环过零鉴相极点配置离散傅立叶变换IIAbstractWiththedemandsofimportantdepartmentsandelectricequipmentsforhigherqualitypowersupplyascendinghighperformancePWMinverteraretakenmoreandmoreattention.Withitsincomparablemerits,digita

3、lcontrolisgraduallytakingplaceofanalogcontrol.Ontheonehand,digitalcontrolledPWMinvertersgainmorefreedomfordesign,withwhichkindsofcomplicatedandintelligentalgorithmscanbeimplementedeasily;ontheotherhand,thetraditionalstrategiesarestillplayinganimportantpoleint

4、hedigitalcontrol.Thehybridstrategiesoftheadvanceddigitalstrategiesandthetraditionalonesarenowmostacceptedintheproductapplication.Buttherealitythetraditionalonesimplementedindigitalmethodcan’tachievetheresultasgoodasinanalog,hinderstheimprovementofthedigitalco

5、ntrolledPWMinverters’performance.ThisdissertationisfocusedontheresearchofthecauseswhichdecreasetheperformanceofthedigitalcontrolledPWMinverterinducedbytheprocessofzeroholdandsample.There‘retwomaincauses.Oneisthechangeofthepropertyarisingfromtheprocessofthezer

6、o-orderhold.Theinfluenceoftheprocessofthezero-orderholdonitsfrequencypropertyisanalyzes,alsoitsinfluenceonthesystemstability.Anotheroneistheeffectofthedelayarisingfromthesampleandcalculation,whichmayresultinthelimitationofthemaxiumratiooftheinverter.Toresolve

7、thisproblem,one-step-delaycontrolisusuallyadopted.Theinfluenceofthiscontrolmethodonthesystemstabilityisalsoanalyzed.Theanalysisshowsthere’rethreekeycauseseffectingthedigitalcontrolledPWMinverter’sperformance:(1)Theprocessofthezeroholdchangestheopen-loopfreque

8、ncypropertyoftheinverterthatisforunderdampsystems,thepropertyvariesperiodicallywithsampletimechangingandforoverdampsystems,variesmonotonously;(2)Theprocessofthezeroholdchangesthesystem’ss