弱电网下VSC控制环路对直流电压稳定性的影响分析  

Impacts Analysis of VSC Control Loop on DC Voltage Control Stability in Weak-grid

作　　者：张思东 黄云辉[1] 周党生 邢中卫 陈付恩 朱国荣[1] ZHANG Sidong;HUANG Yunhui;ZHOU Dangsheng;XING Zhongwei;CHEN Fuen;ZHU Guorong(School of Automation,Wuhan University of Technology,Wuhan 430070,China;Hopewind Electric Co.,Ltd.,Shenzhen 518101,China)

机构地区：[1]武汉理工大学自动化学院,武汉430070 [2]禾望电气股份有限公司,深圳518101

出　　处：《高电压技术》2021年第8期2730-2741,共12页High Voltage Engineering

基　　金：国家自然科学基金(51777146)。

摘　　要：为研究弱电网下电压源型变换器(voltage source converter,VSC)控制环路对直流电压控制稳定性的影响,首先建立了弱电网下VSC直流电压时间尺度小信号模型,基于动力学特性分析法用阻尼分量和恢复分量表征VSC直流电压控制的稳定性。然后研究了不同电网强度和不同控制带宽下VSC锁相环和交流电压控制环对阻尼分量和恢复分量的影响规律,揭示了锁相控制与交流电压控制对直流电压稳定性的影响机理。最后,在Matlab/Simulink中搭建详细的时域仿真模型,对稳定性分析结果进行了验证。研究结果表明,弱电网下锁相控制与交流电压控制对直流电压控制起相位滞后的作用,从而产生负的附加阻尼分量,减弱了直流电压控制的稳定性。In order to study the influence of VSC control loop on the stability of DC voltage control in weak-grid,a time-scale small signal model of VSC DC voltage in weak-grid was established firstly.Based on the analysis of dynamic characteristics,the stability of VSC DC voltage control was characterized by using damping components and restoring components.Moreover,under different strengths and different grid control bandwidths,the influence law of the VSC phase-locked loop and AC voltage control loop on the damping component and restoring component was studied,and the influence mechanism of the phase-locked control and AC voltage control on the DC voltage stability was revealed.Finally,a detailed time-domain simulation model was constructed on the Matlab/Simulink,and the stability analysis results were verified.The research results show that,in a weak grid,the phase-locked control and AC voltage control play a lag role in DC voltage control of phase,and negative additional damping components are generated,which damages the stability of DC voltage control.

关 键 词：弱电网 锁相控制 交流电压控制 直流电压控制 动态特性 稳定性 

分 类 号：TM712[电气工程—电力系统及自动化]