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双星形电容器组中性点不平衡电流实用算法及仿真分析.docx

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双星形电容器组中性点不平衡电流实用算法及仿真分析 Abstract Neutralcurrentunbalanceisanimportantissuethataffectstheperformanceandreliabilityofthepowersysteminstar-connectedcapacitorbanks.Thispaperpresentsanefficientandpracticalalgorithmtocalculateneutralcurrentunbalanceinaseries-connectedcapacitorbankwithtwo-stararrangements,basedonthenodaladmittancematrix.TheproposedalgorithmhasbeenvalidatedthroughsimulationresultsinPSCAD/EMTDCsoftware.Thesimulationresultsdemonstratetheeffectivenessofthealgorithminpredictingneutralcurrentunbalanceanditspotentialapplicationsintheoptimizationofthecapacitorbankconfiguration. Introduction Series-connectedcapacitorbanksarewidelyusedinpowersystemstoimprovethepowerfactorandvoltageregulation.Instar-connectedcapacitorbanks,thecapacitorsareconnectedbetweenphaseconductorsandtheneutralpoint.Theneutralpointofastar-connectedcapacitorbankisacommonpointforallthecapacitorsinthebank.Therefore,anyimbalanceintheneutralcurrentcanleadtounbalancedvoltageacrossthecapacitors,whichmayleadtoovervoltageandprematurefailureofthecapacitors.Inaddition,theunbalancedneutralcurrentcancausetrippingofprotectiverelays,leadingtoequipmentdamageandpowerinterruptions. Toensurereliableandefficientoperationofthepowersystem,itisnecessarytoaccuratelypredicttheneutralcurrentunbalanceinthestar-connectedcapacitorbanks.Anumberofmethodshavebeenproposedintheliteratureforcalculatingtheneutralcurrentunbalance.However,manyofthesemethodsareeithercomplicatedorrequireextensivecalculations.Therefore,thereisaneedforanefficientandpracticalalgorithmtocalculateneutralcurrentunbalanceinstar-connectedcapacitorbanks. Inthispaper,weproposeanefficientandpracticalalgorithmforpredictingtheneutralcurrentunbalanceinstar-connectedcapacitorbanksusinganodaladmittancematrix.TheproposedalgorithmhasbeenvalidatedthroughsimulationresultsusingPSCAD/EMTDCsoftware.Thesimulationresultsdemonstratetheeffectivenessofthealgorithminpredictingneutralcurrentunbalanceanditspotentialapplicationsintheoptimizationofthecapacitorbankconfiguration. Algo