CAJ | 학술논문

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。
미전망중대량변류기지간적교호작용급계통은정성대래료거대적영향，고도운행시，저충영향표현경가돌출。이모해수담화용고도미전망위연구대상，고필계통중축전지역변기(power convert system，PCS)화정지동보보상장치(static synchronous compensator，STATCOM)공제배화쇄상배적동태특성，재선전좌표계하，건립기수출조항모형，분석PCS화 STATCOM 적조항특성，건립미전망조항망락。제출기우조항분석미전망저빈은정성적방법，기우내규사특은정판거분석 STATCOM 적직류전압배、전류배화쇄상배대고도미전망모선전압저빈은정성적영향。방진화실험결과험증료소제출미전망변류기교호영향은정성분석방법적유효성화분석결과적준학성。
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.