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ID:34908131
大小:2.89 MB
页数:74页
时间:2019-03-13
《大型灯贯机组励磁系统的架构及现场应用的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要摘要励磁系统在电力系统的稳定运行中起着重要作用,随着机组容量和电网规模的增大,在带来巨大经济效益的同时小干扰稳定、低频振荡及系统故障问题也日益严重,电网不稳定的次数越来越多,励磁系统的调节是改善电力系统稳定性最有效的方式之一。大型灯贯机组普遍采用自并励励磁方式,本文首先叙述了自并励励磁系统的组成及原理,并对励磁主回路的参数进行了计算。建立了各单元的数学模型,阐述了PID控制规律及参数整定方法。其次,基于峡江水电站大型灯贯机组励磁系统的现场调试,研究了励磁系统的空载闭环及负载闭环特性,确保系统能够正确有效地完成其应有的功能。最后,在MATLAB上建立电力系统单机-无穷大仿真模
2、型,分析了励磁系统的仿真性能。对比励磁系统的仿真和现场应用结果,证明了仿真模型的有效性及参数整定的合理性,为励磁系统的现场调试提供参考,加快调试进度,减少对真机的损伤。然后将自适应控制理论应用于电力系统稳定器(PSS),对其进行外加扰动的仿真试验并与常规PSS进行比较,仿真结果表明自适应PSS能更有效地抑制低频振荡,具有一定的实际应用价值。关键字:自并励励磁系统;应用;MATLAB仿真;自适应电力系统稳定器ⅠAbstractAbstractExcitationsystemplaysanimportantroleinpowersystem’sstableoperation.The
3、increaseofunitcapacityandthepowergridscalebringhugeeconomicbenefits,however,smallsignalstability,lowfrequencyoscillationandsystemfailureproblemareincreasinglyserious,thegridturnsmoreandmoreunstable.Theregulationofexcitationsystemisoneofthemosteffectivewaytoimprovethestabilityofpowersystem.La
4、rgebulbtubularunitwidelyusedtheshuntexcitationmethod.Atfirst,thispaperdescribesthecompositionandprincipleofselfandshuntexcitationsystem,andtheexcitationofmaincircuitparametersarecalculated.Thenestablishthemathematicalmodeofeachunit,explainthePIDcontrollawandparametersettingmethod.Secondly,ba
5、sedonthelargelightpenetrationunitexcitationXiajianghydropowerstationsystemcommissioning,westudytheno-loadandloadclosed-loopcharacteristicofexcitationsystem,andensurethatthesystemcaneffectivelyperformitsduefunctionscorrectly.Finally,weestablishstand-alonepowersystemsimulationmodel–infinityont
6、heMATLABplatform,analyzedthesimulationperformanceoftheexcitationsystem.Thenwecontrastthesimulationwiththefieldapplicationoftheexcitationandprovedthatthesimulationmodelandparametersofexcitationsystemarecorret.Simulationprovidedacertainbasisfortheapplicationwhichcanspeedupthecommissioningprogr
7、ess,reducethedamagetotherealmachine.ThenweappliedtheadaptivecontroltheoryinPowersystemstabilizer(PSS),carryonthedisturbanceofsimulationandcomparewiththeconventionalPSS,thesimulationresultsshowthattheadaptivePSScaneffectivelysuppresslowfrequencyosci
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