基于plc的消弧控制器的分析

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1、华北电力大学硕士学位论文AbstractNeutralgroundedsystemthougharc-suppressioncoil(alsobeknownasresonancegroundingsystem)arebeingusedmoreandmorewidelyinChinarecently．Arciseasytobeextinguishedduetocurrentinarc—suppressioncoilcompensategrid．．to—-groundcapacitivecurrentwhichgreatlyimp

2、rovecontinuityandreliabilityofpowersupply．TherapidandaccuratecompensationfunctiondependsOffdevelopmentofcontroltechnology，SOitissignificanttomakedepthresearchinarc．suppressioncoilcontrollerinordertoachieverapidandaccuratecontrolofarc—suppressioncoil．Avarietyofresona

3、ntgroundingsystemandarc—suppressioncoilcontrollerwereintroducedinthispaper，alsothreemainpartofresonancegroundingsystem：capacitancecurrentmeasurementtechnology，auto-tuningcontrolmethodandsingle．phasetogroundfaultlineselectionweredescribedindetail．Atlast，thedevelopmen

4、talprogrammbasedonPLCwasselected．ThenfaultlineselectionmodelinresonantgroundingsystemwasbuiltbySIMLINKtoolboxinMATLABtofindthecharacteristicsofthefaultlineandprovideatheoreticalbasisforthechoiceofthefaultlineselection．Functionsofcapacitancecurrentmeasurement，appropr

5、iateoperatingpointsetting，manualshiftregulatingandfaultalarmofarc-suppressioncoilwereachievedbyPLC；functionsofzerosequencecurrentcollection，single—phasetogroundfaultlineselectionandliquidcrystaldisplaywereachievedbyembeddedsysteminthedevelopmentofarc．suppressioncoil

6、controller；theycomplementeachothertoachievearapidflexiblecontrolofarc-suppressioncoil．MaincontrolprogramandeachfunctionalmodulesubprogramofPLCandembeddedcontrolsystemwerecompiledaccordingtocontroIrequirements．Inordertoachievethesefunctionsuccessfully，neutralpointdis

7、placementvoltagecollectioncircuit，zerosequencecurrentcollectioncircuitand32．5lineprioritycodingcircuitweredesigned．ThecontrolleriSthecombinationofPLCandembeddedsystem，arcextinguishmentandfaultlineselection，softwareprogrammingandhardwaredesign．Afterrepeatedmodificati

8、onanddebugging，trinityfunctionsofcapacitancecurrentmeas：urement、arcextinguishmentandfaultlineselectionareachieved．Andithashighpracticalval