PWM整流器保持高功率因数运行的方法研究

Research of method of maintaining high power factor for PWM rectifier

针对煤矿井下电压波动严重时影响稳压电源的单位功率因数等问题,提出采用可变输出直流电压法来控制PWM整流器的直流侧电压,以保证PWM整流器处于高功率因数运行的工作状态;详细分析了直流侧电压的选取及交流侧输入电压大范围波动对交流侧输入电流及功率因数的影响,介绍了可变输出直流电压法的控制原则及软件实现。试验结果表明,在电压波动情况下,可变输出直流电压法不仅可使PWM整流器系统稳定,而且可以保持整流器的高功率因数运行状态。

In view of problem that serious voltage fluctuation underground may affect unit power factor of power supply, variable output DC voltage method was proposed to control DC side voltage of PWM rectifier, so as to ensure the PWM rectifier working with high power factor. Selection of DC side voltage and influence of fluctuating of AC side input voltage in a wide range on AC side input current and power factor were analyzed. Control principle and software implementation of variable output DC voltage method were introduced respectively. The test results show that the PWM rectifier with variable output DC voltage control method can work stably and always achieve high power factor under voltage fluctuations.