基于CPS-SPWM调制方式的链式STATCOM研究

摘要

针对非线性、冲击性负荷给煤矿电网注入了大量无功功率和谐波的问题,研究了基于CPS-SPWM调制方式的链式静止同步补偿器STATCOM；介绍了链式STATCOM主电路结构；针对链式STATCOM调制方式包括单极性CPS- SPWM和双极性CPS- SPWM两种调制方式,采用Matlab仿真分析了基于H桥基本模块和基于级联H桥的单极性CPS- SPWM调制方式与双极性CPS- SPWM调制方式的差别,结果表明,单极性CPS- SPWM调制方式的波形质量明显好于双极性CPS- SPWM调制方式,链式STATCOM应选用单极性CPS- SPWM调制方式；采用Matlab/Simulink平台对不同调制比下的基于单极性CPS-SPWM调制方式的链式STATCOM进行仿真,结果表明,该链式STATCOM具有输出波形好、谐波低、扩展性强等特点.%In view of problem that nonlinear and impact load inject plenty of reactive power and harmonic wave into coal mine power grid, the paper researched chain circuit STATCOM based on CPS-SPWM modulation. It introduced main circuit structure of chain circuit STATCOM; for two modulations of unipolar CPS-SPWM and bipolar CPS-SPWM in chain circuit STATCOM, it used Matlab to analyze differences between unipolar CPS-SPWM modulation and bipolar CPS-SPWM modulation based on H-bridge basic module and cascade H-bridge, the simulation result showed that waveform quality of unipolar CPS-SPWM modulation is superior to one of bipolar CPS-SPWM modulation, so chain circuit STATCOM should select unipolar CPS-SPWM modulation; it used Matlab/Simulink platform to make simulation for chain circuit STATCOM based on unipolar CPS-SPWM modulation under different modulation ratios, the simulation result showed that the chain circuit STATCOM has characteristics of good output waveform, low harmonics and strong expandability.