首页|基于虚拟阻抗的微电网逆变器并联运行研究

基于虚拟阻抗的微电网逆变器并联运行研究

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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.
Virtual Impedance-based Parallel Operation of Microgrid Inverters
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 dis-tribute the reactive power reasonably.In order to solve this problem,a virtual impedance-based power droop control strat-egy was proposed.By adjusting the equivalent output impedance of the inverter to be inductive,the power decoupling con-trol 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.

inverterdroop controlvirtual impedancevoltage drop

张恒、何宁辉、周秀、白金、于家英

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国网宁夏电力有限公司电力科学研究院,宁夏 银川 750011

逆变器 下垂控制 虚拟阻抗 电压跌落

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(20)