单相电压型PWM整流器无源控制算法研究

摘要

A passivity based control algorithm is presented for single-phase voltage PWM rectifier which has poor control strategy and performance and other issues.Firstly,the virtual d-q coordinate system was constructed to obtain the d-q axis current component of the rectifier input current so that the input current harmonics can be eliminated or suppressed through the passive current controller.Then,the no-error following of d-q axis current component could be achieved and the rectifier outputed a constant DC voltage.Finally,the evaluation function was introduced to optimize the switching function of the controller,so as to select the optimal switching state.Simulation and experimental results show that this method is more accurate and effective than the traditional PI control algorithm.%以单相电压型PWM整流器为研究对象,针对其控制策略和控制性能不佳等问题,提出由无源电流控制器控制的单相电压型PWM整流器无源控制算法.首先,构建虚拟d-q坐标系获得整流器输入电流的d-q轴电流分量;其次,通过无源电流控制器消除或抑制输入电流谐波,实现对d-q轴电流分量的无差跟踪,使得整流器输出恒定的直流电压;最后,引入评价函数,对控制器的开关函数进行最优选取,从而选择最优开关状态.仿真和实验结果表明,该方法较传统的PI控制算法具有更高的准确性和有效性.