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中文摘要：
微电网中大量变流器之间的交互作用给系统稳定性带来了巨大的影响,孤岛运行时,这种影响表现更加突出。以某海水淡化用孤岛微电网为研究对象,考虑系统中蓄电池逆变器（power convert system,PCS）和静止同步补偿装置（static synchronous compensator,STATCOM）控制环和锁相环的动态特性,在旋转坐标系下,建立其输出阻抗模型,分析PCS和STATCOM的阻抗特性,建立微电网阻抗网络。提出基于阻抗分析微电网低频稳定性的方法,基于奈奎斯特稳定判据分析STATCOM的直流电压环、电流环和锁相环对孤岛微电网母线电压低频稳定性的影响。仿真和实验结果验证了所提出微电网变流器交互影响稳定性分析方法的有效性和分析结果的准确性。
英文摘要：
The stability of micro-grid is strongly influenced by the interaction of converters especially when the micro-grid operates in island mode. Taking example for a micro-grid used to power the system of desalinate seawater, output impedance models of storage battery power convert system （PCS） and static synchronous compensator （STATCOM） are established in rotating coordinate system considering the dynamic characteristic of control loop and phase lock loop （PLL）. The impedance characteristics of PCS and STATCOM are analyzed and the impedance network of micro-grid is presented. A method based on impedance analysis is proposed to study the low frequency oscillation, and the influences of outer voltage loop, inner current loop and PLL on the stabilization of low frequency modes are analyzed using the Nyquist stability criterion. The simulation and experiment results show the effectiveness of the proposed method and the correctness of the analysis.
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