空间矢量调制三相PWM变流器仿真研究

摘要

The PWM Converter is widely used at present with its advantages of getting a higher power factor and efficiency through a simple algorithm. Among all the traditional direct power controls, most of them adopt switch function which leads to unstable switching frequency and the need for higher AD sample rate. This paper was based on Space Vector Modulation instead of switch function and successfully solved the problem of unstable switching frequency. Meanwhile, after carrying out the simulation under Matlab/Simulink, it also verified the validity of the scheme as well as its satisfaction to the need of PWM rectifier AC side current controllability, high power factor and low current THD with good dynamic and static performance.%PWM变流器直接功率控制因具有更高的功率因数、高效率、控制算法简单等优点得到广泛的应用.综合比较各种传统直接功率,控制算法大都采用开关表控制,存在开关频率不固定,需要较高的AD采样频率等缺点.基于瞬时功率理论,采用空间矢量算法取代开关表控制,解决了开关频率不固定这个问题.并且在Matlab/Simulink下进行仿真,结果表明,空间矢量方案能满足PWM变流器交流侧电流可控、高功率因数、低电流THD的要求,且具有良好的动、静态性能.