数字控制pwm逆变电源关键技术研究.pdf

《数字控制pwm逆变电源关键技术研究.pdf》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

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 都靠反复凑试对周期鉴相的基于模型的参数设计方法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可能出现的多个过零点鉴相失败的问题本文也力图解决该问题TMS320F240全数字锁相环进行了精确建模分析并分析了过零检测可能出现的跳周鉴相失败问题提出了等效给出了参数针对过零检测提出了基于离散傅立叶鉴相的数字锁相环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正仿真和实验验证了该鉴相方法的可行性同样建立了其模型

2、反馈鉴相失败问题关键词PWM逆变电源数字锁相环数字控制过零鉴相零阶保持极点配置状态观测器离散傅立叶变换II AbstractWiththedemandsofimportantdepartmentsandelectricequipmentsforhigherqualitypowersupplyascendinghighperformancePWMinverteraretakenmoreandmoreattention.Withitsincomparablemerits,digitalcontrolisgraduallytakingplaceofanal

3、ogcontrol.Ontheonehand,digitalcontrolledPWMinvertersgainmorefreedomfordesign,withwhichkindsofcomplicatedandintelligentalgorithmscanbeimplementedeasily;ontheotherhand,thetraditionalstrategiesarestillplayinganimportantpoleinthedigitalcontrol.Thehybridstrategiesoftheadvanceddigita

4、lstrategiesandthetraditionalonesarenowmostacceptedintheproductapplication.Buttherealitythetraditionalonesimplementedindigitalmethodcan’tachievetheresultasgoodasinanalog,hinderstheimprovementofthedigitalcontrolledPWMinverters’performance.Thisdissertationisfocusedontheresearchoft

5、hecauseswhichdecreasetheperformanceofthedigitalcontrolledPWMinverterinducedbytheprocessofzeroholdandsample.There‘retwomaincauses.Oneisthechangeofthepropertyarisingfromtheprocessofthezero-orderhold.Theinfluenceoftheprocessofthezero-orderholdonitsfrequencypropertyisanalyzes,alsoi

6、tsinfluenceonthesystemstability.Anotheroneistheeffectofthedelayarisingfromthesampleandcalculation,whichmayresultinthelimitationofthemaxiumratiooftheinverter.Toresolvethisproblem,one-step-delaycontrolisusuallyadopted.Theinfluenceofthiscontrolmethodonthesystemstabilityisalsoanaly

7、zed.Theanalysisshowsthere’rethreekeycauseseffectingthedigitalcontrolledPWMinverter’sperformance:(1)Theprocessofthezeroholdchangestheopen-loopfrequencypropertyoftheinverterthatisforunderdampsystems,thepropertyvariesperiodicallywithsampletimechangingandforoverdampsystems,variesmo

8、notonously;(2)Theprocessofthezeroholdchangesthesystem’