级联多电平分布式开关电源调制方法研究

针对级联型逆变器结构的分布式电源的应用,提出了一种基于阶梯波的交流母线分布式电源电路.通过将具有不同相移的逆变单元输出的方波叠加,得到阶梯波交流母线电压输出.文章讨论了级联多电平逆变器的几种典型的阶梯波调制方法,提出了一种改进的等宽方波调制法.采用该调制方法的三单元逆变器母线电压的谐波含量降到了基波电压幅值的9.8%.使用该调制法的具体电路结构,最后通过了仿真实验验证.

Modulation Method of Cascaded Multilevel Distributed Switching Power

Against the application of distributed power with cascade inverter structure,this thesis introduces a new exchange bus distributed power system based on ladder wave is introduced.The system achieves output of stepped-exchange bus by superposition square wave with different phase shift which comes from inverter module.Several typical ladder wave modulation methods for cascaded multi-level inverter are discussed and a modified width square wave modulation is proposed.This modulation makes the harmonic content for the bus voltage of three module inverter drop down to the 9.8% of fundamental voltage amplitude.The specific circuit of modulation is presented.The simulation experiments show the effectiveness of the circuit.