三相电压不平衡情况下电机车整流技术的研究

摘要

针对煤矿井下直流电机车变流系统中存在三相电压不平衡而使传统的PWM整流器的交流侧出现负序电流分量的问题,提出了一种在三相电压不平衡情况下抑制PWM整流器交流侧负序电流分量的控制策略；详细介绍了该控制策略的具体实现.仿真及现场实验结果表明,采用该控制策略后,PWM整流器的交流侧电流波形基本接近正弦波形,实现了单位功率因数运行.%In view of problem of negative sequence current component in AC side of traditional PWM rectifier because of unbalanced three-phase voltage existed in converter system of underground DC electric locomotive, the paper proposed a control strategy of restraining negative sequence current component of AC side of PWM rectifier under unbalanced three-phase voltage. It introduced implementation of the control strategy in details. The results of simulation and field experiment showed that current wave of AC side of PWM rectifier is close to sine wave and realizes running with unity power factor after using the control strategy.