中国电机工程学报2020，Vol.40Issue(9)：3008-3020,13.DOI:10.13334/j.0258-8013.pcsee.190237
逆变器并网系统谐振机理与阻尼控制策略研究
The Stability Criterion and Damping Control Strategy for Grid-connected Inverters and Its Impact on the Global System
摘要
Abstract
The equivalent impedance of the inverter's Norton equivalent circuit is coupled with the power system,which is the source of the resonance that caused by the grid-connected inverter.Therefore,this paper studied the impedance characteristic of inverters and proposed a stability criterion based on the impedance characteristic curve.Firstly,combined the theoretical analysis and the physical measurement results of the inverter's equivalent impedance,the impedance characteristic of inverters was studied to be inherent and negative at some frequencies.On this basis,the stability criterion of grid-connected inverters was obtained:in the case that the system impedance has resistance characteristic,if the conductance property of all the grid-connected inverters is positive,the grid-connected system is stable;if there is the inverter with negative damping characteristic,the grid-connected system has the resonance risk.Therefore,an inverter damping control method was proposed.In the premise that the inverter closed-loop is stable,the inverter impedance characteristic curve can be calibrated with the purpose that the inverter conductance is stable positive value in the whole frequency band,so the inverter impedance characteristic can meet the condition of maintaining the system stability.Simulation and physical experiments demonstrated the effectiveness of the analytical method and the control method.关键词
逆变器多机并联/稳定判据/阻尼控制Key words
multi-paralleled inverters/stability criterion/damping control分类
信息技术与安全科学引用本文复制引用
王一,刘树,刘建政,王皆庆..逆变器并网系统谐振机理与阻尼控制策略研究[J].中国电机工程学报,2020,40(9):3008-3020,13.基金项目
国家重点研发计划项目(2017YFB0902400).National Key R&D Program of China (2017YFB0902400). （2017YFB0902400）
