基于新型相位幅值控制的三相PWM整流器双向工作状态分析

介绍了一种三相PWM双向变流器的新型间接电流控制系统。采用变流器前端电压与交流电源电压的滞后角度(?) 作为输入变量的新型相位幅值控制方法,并在闭环系统中将 PI调节器输出作为滞后角(?)。重点分析了单位功率因数下 PWM变流器整流和逆变双向工作原理、调制比mr和滞后角(?)的关系并给出了关系曲线。分析了保证系统稳定工作参量(?)变化范围和约束条件和负载扰动时系统调节过程,得出了系统稳定工作条件。新型相位幅值控制简单且容易实现, 通过仿真和实验验证了该系统可双向工作且能实现单位功率因数。

Analysis of Bi-direction Operation State of Three Phase PWM Rectifier Based on a New Phase and Amplitude Control

A three-phase PWM reversible rectifier controlled by a novel phase and amplitude is presented in this paper. The lagging phase angle (?) between the front end voltage of the rectifier and ac supply voltage is used as the input variable and the output of PI regulator is regarded as the angle (?) in the close loop system. The bi-direction operation principle of the system and the relation between modulation index mr and (?) is analyzed in detail under rectifying and inverting. The relation curves are given when a load changes. The constrained condition of (?) is derived in order to assure the converter stability. The novel phase and amplitude control method is simple and easy to implement. Simulation and experiment results are provided to demonstrate the performance of the system.