引入功率微分项下垂控制的逆变器并联系统小信号稳定性分析  

Small-Signal Stability Analysis of Parallel Inverter System With Power Differential Term Droop Control

作　　者：陈昕[1] 张昌华[1] 黄琦[1] 罗曼[1] 

机构地区：[1]电子科技大学能源科学与工程学院,四川省成都市611731

出　　处：《电网技术》2016年第11期3467-3473,共7页Power System Technology

基　　金：第50批教育部留学回国人员科研启动基金;中央高校基本业务费项目(ZYGX2015J104)~~

摘　　要：经典的电压-频率下垂控制的逆变器并联系统存在受扰易产生振荡的问题,在下垂控制中引入功率微分项是有效的解决方法。建立了经典下垂控制与引入功率微分下垂控制的多逆变器并联系统完整的小信号模型。分析了下垂系数与功率微分系数对系统特征根分布的影响,得到了引入功率微分项后系统低频域特征根阻尼比增加,可有效抑制扰动带来的振荡的结论。分析了各参数变化对系统稳定性的影响,为系统参数设计与性能分析提供了理论依据。最后通过Matlab/Simulink建模仿真,结果表明系统受扰的响应与理论分析一致,验证了建模与理论分析的正确性。For output oscillation problem when parallel inverter system uses conventional voltage amplitude and frequency droop control, introducing power differential term in droop control is an effective method to solve this problem. A complete small-signal model of conventional droop control with power differential droop control added is developed. Firstly, impact of droop parameters and power differential parameters on eigenvalue distribution is studied. It is concluded that damping ratio of low-frequency eigenvalues is increased and oscillation caused by disturbance is suppressed when power differential term is added. Secondly, influence of control parameters on system small-signal stability is analyzed, providing theoretical basis for parallel system performance analysis and droop coefficient design. Above conclusions are verified with Matlab/Simulink simulation.

关 键 词：微电网 下垂控制 小信号稳定性 功率微分项 

分 类 号：TM71[电气工程—电力系统及自动化]