基于虚拟阻抗的微电网逆变器并联运行研究  

Virtual Impedance-based Parallel Operation of Microgrid Inverters

作　　者：张恒 何宁辉 周秀 白金 于家英 ZHANG Heng;HE Ninghui;ZHOU Xiu;BAI Jin;YU Jiaying(State Grid Ningxia Electric Power Research Institute,Yinchuan 750011,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750011

出　　处：《电工技术》2024年第20期81-84,共4页Electric Engineering

摘　　要：在低压微电网逆变器并联运行系统中,逆变器等效输出阻抗一般呈阻性或阻感性,传统下垂控制方法会使功率发生耦合,难以使无功功率合理分配。为解决此问题,提出了一种基于虚拟阻抗的功率下垂控制策略,该策略通过调节逆变器等效输出阻抗为感性,实现了功率解耦控制,满足了下垂控制的需要,同时改善了负荷投切时电压的跌落。在MATLAB/Simulink中搭建2台逆变器的并联运行系统进行仿真,结果表明该策略实现了功率的合理分配且具有良好的动态性能。In the parallel operation system of low-voltage microgrid inverters,the equivalent output impedance of inverters is generally resistive or inductive.The conventional droop control method will couple the power and make it difficult to distribute the reactive power reasonably.In order to solve this problem,a virtual impedance-based power droop control strategy was proposed.By adjusting the equivalent output impedance of the inverter to be inductive,the power decoupling control was realized,which was adequate for droop control and improved the voltage drop during load switching.The parallel operation system of two inverters was built in MATLAB/Simulink for simulation.The results showed that the strategy realized the reasonable distribution of power and exhibited good dynamic performance.

关 键 词：逆变器 下垂控制 虚拟阻抗 电压跌落 

分 类 号：TM464[电气工程—电器]