中文摘要：

通过分析电压源型逆变器的拓扑结构和控制策略,建立了逆变器输出阻抗模型。结合阻抗分析方法分析了逆变器中滤波器参数和控制环路增益对其输出阻抗、逆变系统等效环路增益及稳定性的影响规律,并采用时域分析方法验证了相关分析的正确性。基于微网孤岛运行时多逆变器并联的特点,提出了一种导纳域的稳定性判断方法,给出了逆变器输出导纳和负载输入导纳之间量化的稳定性判断条件,通过合理设计微源输出导纳以保证微网系统的稳定性。仿真和实验结果验证了所提方法的正确性和可行性。

英文摘要：

The output impedance model of voltage-source inverter is established based on the analysis of its topology and control strategy. The influence of its filter parameters and control loop gain on its output impedance,equivalent loop gain and system stability is analyzed by the impendence analysis method,the correctness of which is verified by the time-domain analysis method. Since the multiple inverters of islanded microgrid are connected in parallel,a method to judge the stability of admittance domain is proposed and the quantized criterion of stability between inverter output admittance and load input admittance is given. The system stability of microgrid can be ensured by the proper design of micro-source output admittance. Simulative and experimental results demonstrate the correctness and feasibility of the proposed method.