基于阻抗模型的网状微电网MFD稳定分析

摘要

针对网状孤岛微电网中的高频稳定性问题进行研究.首先对含有n台逆变器的微电网系统进行阻抗模型分析,获得基于阻抗模型的闭环传递函数矩阵,进而可以应用多项式矩阵分式(MFD)稳定判据进行稳定性分析.该方法分析过程简单,计算量小,同时基于阻抗物理模型建模,特性明确.然后进行了仿真和实验分析验证,说明了线路参数和电压电流环控制参数对于稳定性的影响,同时证明了网状微电网系统整体建模和MFD稳定判据的正确性和有效性.%This paper addresses the high-frequency harmonic stability of meshed inverters in islanded microgrid.Firstly,the impedance based closed-loop transfer function matrix of the microgrid which contains many meshed inverters is obtained.Then the stability of the system is assessed by the Matrix-Fraction Description (MFD) stability criterion.The analysis of the system has smaller amount of computations and simple character because of the impedance-based analytical approach.Furthermore,simulations and experimental results are performed to validate the effects of the line parameter and control parameter of the voltage and current controllers on stability.In addition,the case verify the correctness of the system modeling and the effectiveness of the MFD stability criterion.