【摘要】 针对三电平PWM整流器的拓扑结构进行了分析,在建立其同步旋转坐标系数学模型的基础上,设计了电压、电流双闭环控制器。保证电流内环较快的跟随性能,控制交流侧电流为畸变很小的正弦化电流,且功率因数为1;保证电压外环的抗扰性能,稳定直流侧输出电压。系统还采用基于零序电压注入的SPWM控制方法对中点电位进行控制,此方法不仅使中点电位得到有效的平衡,而且控制方法简单,鲁棒性能也强。利用上面所述方法对系统进行Matlab软件仿真分析,验证了系统控制方法的正确性,并在此基础上使用MC56F8345DSP作为主控芯片完成了硬件电路的搭建,通过实验验证了双环控制器和中点电压平衡方法的可行性和有效性。更多还原

【Abstract】 Three-level PWM rectifier topology was analyzed. Voltage and current double closed loop controller was designed on the basis of established mathematical model in the synchronous rotating coordinate system. Faster tracking performance of the current loop was ensured. The AC side current distortion with small sinusoidal current and the power factor of 1, was controlled. Immunity performance of the voltage loop to stabilize the DC side output voltage was ensured. Midpoint potential was controlled by SPWM control method based on zero-sequence voltage injection. Midpoint potential was effectively balanced by using this simple and strong robust performance method. The correctness of the system control method was verified using Matlab software simulation analysis of the above-mentioned method. Using MC56F8345DSP as a master chip, the hardware circuit building and experimental verification were completed. The feasibility and effectiveness of the double loop controller and the midpoint potential balance method were verified.更多还原