电网技术2017，Vol.41Issue(4)：1061-1067,7.DOI:10.13335/j.1000-3673.pst.2016.3274
并网逆变器复合电流环引起次/超同步振荡机理研究
Mechanism Research of Subsynchronous and Supersynchronous Oscillations Caused by Compound Current Loop of Grid-Connected Inverter
摘要
Abstract
To analyse subsynchronous and supersynchronous oscillations in power systems in China caused by grid-connected inverters,a single inverter connected to an ideal electric source via a reactance was built as a typical system.D-axis and q-axis current loops of the grid-connected inverter system were coupled due to existence of dynamics of phase-lock loop and large grid reactance.A compound current loop model of this system was built up considering both d-and q-axis models.The compound current loop had positive feedback effect,related to phase-lock loop,current controller,system operating point,grid reactance and filter reactance.The oscillations would happen if these factors were not properly matched.Root locus method was used to analyze influence of these factors on system stability.An oscillation damping method is discussed by properly adjusting control parameters of the grid-connected inverter.With time domain simulation,accuracy of the compound current loop model and effect of subsynchronous and supersynchronous oscillation damping by adjusting current controller parameter are verified.Finally,application prospect of the compound current loop is explored.关键词
次同步振荡/超同步振荡/并网逆变器建模/复合电流环/振荡抑制Key words
subsynchronous oscillation/supersynchronous oscillation/grid-connected inverter modeling/compound current loop/oscillation damping分类
信息技术与安全科学引用本文复制引用
王晖,李莹,李文锋,王超,刘明松,杨大业..并网逆变器复合电流环引起次/超同步振荡机理研究[J].电网技术,2017,41(4):1061-1067,7.基金项目
国家重点研发计划课题(2016YFB09006051) （2016YFB09006051）
国家电网公司科技项目(XT71-15-064).Project Supported by National Key Research and Development Plan(2016YFB09006051) （XT71-15-064）
Project Supported by State Grid Science & Technology Project (XT71-15-064). （XT71-15-064）
