第46卷第3期2023年6月电子器件ChineseJournalofElectronDevicesVol.46No.3June2023项目来源:2021年河南省职业教育教师教学创新团队(教办职成〔2021〕115号);2021年河南省高等教育教学改革研究与实践项目(2021SJGLX891)收稿日期:2021-10-29修改日期:2022-03-21ResearchonLineImpedanceIdentificationMethodBasedonVariableStepErrorCompensation∗ZHANGSai∗,XIADeyin(DepartmentofElectricalEngineering,XuchangElectricalVocationalCollege,XuchangHe’nan461000,China)Abstract:Duetotheregionallimitationofrenewableenergypowergeneration,generally,therenewableenergypowergenerationsystemneedsalonglineforgridconnection,sothelineimpedancecannotbeignored.Theexistenceoflineimpedancewillincreasethecontroldifficultyofgridconnectedinverter,sotheon⁃lineidentificationofgridimpedanceisconducivetoimprovethecontrolaccuracyofgridconnectedsystem.Avariablestepsizeerrorcompensationstrategyisproposed.Theidealgridvoltageisobtainedbysamplingthevoltageandcurrentofthegridconnectioncouplingpoint,andthenthevoltageofthegridconnectioncouplingpointpassingthroughtheband⁃passfilter.Throughthisinformation,combinedwith...