第42卷第2期2023年2月ZhejiangElectricPowerVol.42,No.02Feb.25.2023考虑全功率换流器低电压穿越的潮流解存在性分析兰洲1,但扬清1,谷纪亭1,娄云天2(1.国网浙江省电力有限公司经济技术研究院,杭州310008;2.浙江大学电气工程学院,杭州310027)摘要:针对低电压穿越期间含全功率换流器系统可能失去潮流解的问题,分析了故障期间电网等值参数和潮流特性的变化规律,考虑换流器的控制特性,采用数值计算定性分析了不同系统变量对潮流解存在性的影响规律。基于电网等值参数变化规律和潮流雅克比矩阵行列式实时计算的方法,提出了仅需非故障电网等值参数和并网点实测电压的有功电流限幅自律控制方法。仿真结果表明,所提方法能够保证故障低电压穿越期间潮流解的存在,有利于电力系统的安全稳定运行。关键词:新能源发电并网;全功率换流器;低电压穿越;潮流解存在性;自律控制DOI:10.19585/j.zjdl.202302003开放科学(资源服务)标识码(OSID):ExistenceanalysisofpowerflowsolutionconsideringLVRTofafull-powerconverterLANZhou1,DANYangqing1,GUJiting1,LOUYuntian2(1.StateGridZhejiangEconomicResearchInstitute,Hangzhou310008,China;2.CollegeofElectricalEngineeringZhejiangUniversity,Hangzhou310027,China)Abstract:Powerflowsolutionofthesystemwithafull-powerconvertermaygetlostduringlow-voltageride-through(LVRT).Therefore,thechangelawofgridequivalentparametersandpowerflowcharacteristicsduringthefaultisanalyzed,andthelawofinfluenceofdifferentsystemvariablesontheexistenceofpowerflowsolutionisanalyzedqualitativelybynumericalcalculationconsideringthecontrolcharacteristicsoftheconverter.Basedonthevariationlawofthegridequivalentparametersandthereal-timecalculationofthedeterminantoftheJacobimatrixofpowerflow,anactivecurrentamplitudelimitingandautoregulationmethodisproposedthatonlyrequiresthenon-faultgridequivalentparametersandthemeasuredvoltageatthegrid-connectedpoint.ThesimulationresultsshowthattheproposedmethodcanensuretheexistenceofthepowerflowsolutionduringLVRTandisconducivetothesafeandstableoperationofthepowersystem.Keywords:grid-connectednewenergypower;full-powerconverter;LVRT;existenceofpowerflowsolution;auto⁃regulation0引...