多重化逆变器的一种控制方法研究

Research on control method of multiunit inverter

多重化结构逆变器是一种新型结构的逆变器,该逆变器各功率单元构造相同,便于模块化设计和制造,系统可靠性高。各单元的输出通过功率变压器的耦合叠加实现高压输出,适合高压大功率场合。研究了多重化逆变器的一种控制方法,采用逆推的方法确定各单元的触发脉冲,通过多重移相叠加原理得到正弦波输出。能够应用较少的功率器件和较少的功率单元得到多电平的合成波,输出波形更加逼近正弦波,谐波含量小。应用Matlab软件进行仿真分析,验证了设计的合理性。

The muhiunit inverter is composed of several same power units,which makes the modularized design and manufacture easy and the system reliable. The high voltage output is realized by coupling the power units through power transformer for high voltage and high power applications. A new control method of muhiunit inverter is described,which determines the triggering pulse for each unit to obtain the sine wave output through multiple-phase shifting superimposition principle. Less power units and devices are needed to generate multilevel sine- like wave with low harmonic contents. The simulation with Matlab verifies its rationality.