单一直流电源供电七电平级联逆变器的研究

Research on 7-Level Cascaded Inverter Supplied by a Sperate DC Power Source

针对传统的级联逆变器需要多个独立直流电源供电存在的问题,提出了一种只需一个直流电源供电、可实现七电平输出的级联逆变器。分析了这种级联逆变器的两种工作模式,给出了逆变器的控制调节方法。最后通过实验结果,验证了单一直流电源供电七电平级联逆变器理论分析的正确性。这种级联逆变器不但控制简单,能输出很好的电压波形,还可以减少直流电源数,提高直流电源的利用率。

Aiming to the problems of the traditional cascaded inverter produced by severl independent DC power supplies,this paper proposes a kind of cascaded inverter supplied by a separate power source which can realize 7-level output.The two kinds of operating mode of the cascaded inverter are analyzed,and the control method of the inverter is provided.Finally,the experimental results verify the theory analysis.The new type of cascaded inverter not only is simple in control,but also can output high quality waveforms,reduce the number of DC power sources,and improve the utilization of DC source.