摘要
该文对网侧瞬时功率和指令电流进行分析,提出一种抑制电网不平衡下三相电压源整流(voltage source rectifier,VSR)直流侧谐波的控制策略。瞬时功率中考虑网侧滤波损耗,对指令电流正序分量采用PI控制,负序分量采用PR控制,正、负序分量均实现无静差跟踪控制,且负序无需解耦。最后基于Matlab/Simulink仿真平台在电网电压不平衡情况下对三相VSR进行仿真分析,仿真结果验证了采用PI与PR混合控制策略能有效抑制直流侧电压2次波动,同时可以实现交流侧的不同功率因数控制。
Instantaneous power and directive current of the at the DC side of the three-phase VSR under unbalanced power line side are analyzed, and a control strategy of restraining harmonics grid is proposed. Grid side power loss is considered for instantaneous power, PI control is adopted for positive-sequence components of directive current while PR control is adopted for negative sequence components, and unsteady-state error follow-up control is realized for both positive and negative sequence components, with decoupling of negative sequence components being avoided. Finally, simulation analysis on three-phase VSR under unbalanced grid voltage condition is given based on Matlab/Simulink simulation platform. The simulation results verify that the PI and PR hybrid control strategy can effectively restrain secondary fluctuations of DC side voltage and achieve different power factor control at the AC side at the same time.
出处
《智能电网》
2017年第4期392-396,共5页
Smart Grid
关键词
电网不平衡
PI控制
PR控制
正负序分量
无静差跟踪控制
unbalanced power grid
PI control
PR control
positive and negative sequence components
unsteady-state error follow-up control
作者简介
李静（1985），女，硕士，工程师，主要研究方向为电网谐波控制、智能电网评价等的项目管理以及期刊编辑等工作，88521296@163．com；
张朋科（1980），男，硕士，工程师，主要从事建筑电气设计及建筑电气工程管理，pengke0304@163．com；
任思源（1982），男，博士，讲师，主要研究方向为电力系统中的电力电子技术、现代测量技术，dxf_ft@yeah．net。
