4象限H桥功率单元PWM整流器的比例-积分-谐振控制

摘要

4象限H桥级联型多电平变换器的功率单元中,由于单相H桥逆变器的输出功率中含有2倍于输出电压频率的脉动分量,如果输入级的PWM整流器采用传统的控制策略,直流母线电压也将会含有该频率的脉动.在PWM整流器电压定向控制中,使用比例-积分-谐振(PIR)调节器控制电压环和电流环,抑制了直流母线电压的脉动,在小功率平台上的实验证明了该控制策略的有效性.%In power cells of the four-quadrant cascaded H-bridge multilevel converters,the output power of H-bridge single-phase inverters contains component whose frequency is twice the output voltage frequency. This component will cause the DC-link voltage to pulsate if the PWM rectifier in the input stage is controlled with the conventional method. Proportional-integral-resonant (PIR) regulator was proposed for the DC-link voltage loop and the AC current loop of the voltage-oriented control of the PWM rectifier. Experimental result shows that the DC-link voltage is well-controlled even with a very small DC-link capacitor,which confirms the effectiveness of proposed control strategy.