交流励磁用三相PWM整流器的研究

为了改善脉宽调制型整流器(PWM整流器)的动、静态性能,基于三相PWM整流器的矢量控制原理,建立了整流器输入电流控制所需的d-q模型,提出了d、q轴电流的状态解耦和电网电压前馈补偿的综合控制策略,从而对电网波动和负载扰动具有较强的抗干扰能力.样机实验表明,该整流器能获得单位功率因数的正弦输入电流、稳定的直流输出电压和快速的动态响应,能够实现能量的双向流动,是满足交流励磁需要的理想整流电源.

Study of three-phase PWM rectifier for AC-excitation

As an AC power source, the back-to-back PWM converter has good practical prospects for AC-excited variable-speed constant-frequency generation, wherein high-frequency PWM rectification is a key technology. To improve the steady and dynamic performance of the three-phase PWM rectifier, the d-q model based on the vector control principle was used to construct the rectifier's input current. The d-q model based current state decoupling and grid voltage feed-forward compensation control strategy was put forward to improve the ability against the grid fluctuation and load disturbance. Sinusoidal input current with unit power factor, steady output DC-voltage and fast dynamic response, as well as bi-direction power flowing ability shown in the experiment show that the converter is an ideal rectifying power supply for AC-excited generator.