三相高功率因数电压型PWM整流器控制策略

研究了三相高功率因数电压型脉宽调制(PWM)整流器的控制策略,提出了建立三相电压型PWM整流器主功率电路小信号模型的方法,设计了电压控制器。详细地分析了三相电压型PWM整流器的高频数学模型,介绍了两相静止坐标系下和两相旋转坐标系下实现高功率因数的控制方法。在旋转坐标下,输入电压、电流是直流量,电流调节器采用PI调节器可实现输入电流无静差地跟踪给定电流,从而实现网侧的单位功率因数。根据瞬时功率守恒原理推导了功率电路的传递函数,建立了电压开环的小信号模型,进而设计了电压外环调节器。实验结果表明,文中控制参数确定方法是正确的,提出的控制策略可以进行三相PWM整流器的工程化设计。

Control Strategy of Three Phase High Power Factor PWM Rectifier

The control strategy for three-phase-high-power-factor PWM rectifier is studied, and the methodology of building the small signal model of the main power circuit is proposed. High frequency model for the rectifier mentioned and the input-to-output transfer function for the system are deduced with analysis. Design principle and method of the voltage regulator are given based on the model built. In synchronously rotating d-q reference frame, the input current and voltage is DC, so PI controller can completely implement current tracking down the programmed current given, and achieve the unity power factor in line grid side. At the end of the paper, experimental results verify the validity of the control strategy proposed.