基于混合同步控制的构网型逆变器并网系统小扰动稳定性分析  

Study on small-signal stability of grid-connected grid-forming inverter system based on hybrid-synchronous control

作　　者：邱晓燕[1] 林号缙 周毅 闫幸 臧天磊 邱一苇 周步祥[1] QIU Xiaoyan;LIN Haojin;ZHOU Yi;YAN Xing;ZANG Tianlei;QIU Yiwei;ZHOU Buxiang(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,四川成都610065

出　　处：《电力自动化设备》2023年第9期172-178,185,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51907097,52307126);中央高校基本科研业务费专项资金资助项目(2022SCU12006)。

摘　　要：由于构网型逆变器并网系统的混合同步控制(HSC)中直流电压控制、锁相环(PLL)、功率同步环(PSL)与电网阻抗间存在复杂交互,同步控制参数在不同电网强度下对并网系统小扰动稳定性的影响规律尚不清楚.针对该问题,首先建立了基于HSC的构网型逆变器并网系统状态空间模型,并基于根轨迹法分析了不同电网强度混合同步环中同步参数对并网系统小扰动稳定性与失稳模式的影响规律;在此基础上,给出了混合同步环中附加PLL支路参数和PSL参数的协同选取方法,以实现HSC构网型逆变器在宽电网强度下范围稳定运行.基于MATLAB/Simulink的仿真分析验证了理论分析的正确性.Due to the complex interaction exists among direct voltage controller,phase locked loop(PLL)and power synchronous loop(PSL)in hybrid-synchronous control(HSC)of grid-connected grid-forming(GFM)inverter system,and grid impedance,the influence laws of synchronization loop’s parameters on small-signal stability of the system under different grid strengths are still unclear.To solve this problem,a HSC-based state-space model for the GFM inverter system is established,the influence laws of control parameters of hybrid-synchronous loop on the small-signal stability and instability modes of grid-connected systems under different grid strengths are analyzed based on root locus method.Based on this,a selecting method about the control parameter of the additional PLL branch is proposed to ensure the stable opera⁃tion of the HSC-based grid-connected inverter system irrespective of grid strength.The simulative analysis based on MATLAB/Simulink verifies the correctness of the theoretical analysis.

关 键 词：并网逆变器 构网型逆变器 混合同步控制 控制参数 小扰动稳定 状态空间模型 

分 类 号：TM464[电气工程—电器]