级联H桥多电平变流器调制策略及其实验验证

载波相移正弦脉宽调制技术(Carrier Phase Shifted Sinuous Pulse Width Modulation,CPS-SPWM)可以在较低的开关频率下有效地抑制和消除低次谐波,并具有相当大的传输带宽,是一种适于大功率电力电子装置的较佳的开关调制策略.级联型多电平变流器在各种多电平变流器中具有所需元器件最少、易实现直流侧均压、有利于模块化设计等优点.基于CPS-SPWM技术的级联型多电平变流器结合了二者的优势,在大功率电力电子装置中有良好的应用前景.通过具体实验,验证了级联H桥单相三电平、五电平、七电平、九电平变流器的CPS应用方法及其良好特性.

Cascade H-bridge Multilevel Converter Modulation Strategy and Its Experiment

Carrier phase shifted SPWM(CPS-SPWM) technique can reach an effect of higher equivalent switching frequency under much lower device switching frequency.This technique improves the equivalent switching frequency through the counteract of lower order harmonics rather than simply processing the harmonic from lower order to higher order;Cascade multilevel converter has many advantages such as the least component amount,the easily balanced DC link voltage due to the separate DC source structure and the identity of each converter unit that is available to perform the modularized design and redundant design.The cascade multilevel converter based on CPS-SPWM technique has both of the advantages,so it has attractive perspective in large power application.The experiment,including single phase three-level,five-phase,seven-level,nine-level converter,is performed and the experimental result is given.Experimental results prove that cascade multilevel converter based on CPS-SPWM can achieve excellent characterizes.