基于DSP的九级注入式电压源型变流器

The Nine-level Injection of Voltage Source Inverter on DSP

交直流变换器是FACTS和HVDC应用中的基本装置,是一种新型九级注入式电压源型变流器(MLVR-VSC),它结合多电平、软开关及注入概念适合大功率AC-DC变换的技术,解决高压换流阀中直接串接开关的动态电压平衡问题,有利于消除谐波,输出高性能的电压、电流波形。主控桥开关工作频率低,可以在零电压条件下切换,大大提高了大功率变流器的运行效率和可靠性。

The new concept of nine-level reinjection VSC（MLVR-VSC）is proposed . A control strategy is proposed for achieving the system capacitor voltage balancing the switching sequence which maintains capacitor voltage balancing is presented. The digital signal processor is used as core of control circuit,the firing logic for the switches are programmed.