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含STATCOM的孤岛微电网低频稳定性分析 被引量:19

Low-frequency Stabilization Analysis of Isolated Micro-grid With STATCOM
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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。 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.
出处 《中国电机工程学报》 EI CSCD 北大核心 2015年第10期2454-2462,共9页 Proceedings of the CSEE
基金 国家自然科学基金项目(51277137 51177113) 国家自然科学基金重大项目(51190102)~~
关键词 微电网 STATCOM 低频振荡 稳定性 阻抗模型 STATCOM micro-grid low-frequency oscillation stabilization impedance model
作者简介 胡伟(1981),女,博士研究生,主要研究方向为微电网建模、动态等值以及微电网电能质量研究,huweitest@163.com: 孙建军(1975),男,副教授,主要研究方向为电能质量分析及治理、大功率电力电子技术应用及其研究; 查晓明(1967),男,教授,博士生导师,主要研究方向为微电网分析与控制、电能质量分析与控制以及大功率电力电子变换技术研究。
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