Multilevel Converter And A Method For Controlling Multilevel Converter Including Balancing Cell Voltages

摘要

A multilevel converter for controlling a multilevel converter is provided. The multilevel converter is a single phase converter with one phase leg, or a three phase converter with three phase legs, the phase legs of the three phase converter are interconnected in a star-configuration. The single phase converter with one phase leg, or each three phase converter with three phase legs, phase leg includes switching cells, and each switching cell includes semi-conductor switches arranged to selectively provide a connection to a corresponding energy storage element. The converter also includes a controller, which is provided to monitor the DC voltage of the energy storage elements, and the controller is provided to control the switching of each switching cell. The phase leg of the single phase converter, or each phase leg of the three phase converter, includes two parallel branches of switching cells, the branches being configured in a closed circuit.

主权项

1. A multilevel converter being
a single phase converter with one phase leg, or a three phase converter with three phase legs, the phase legs of the three phase converter being interconnected in a star-configuration, the single phase converter with one phase leg, or each three phase converter with three phase legs comprises switching cells, each switching cell comprises semi-conductor switches arranged to selectively provide a connection to a corresponding energy storage element, the converter also includes a controller, which is provided to monitor the DC voltage of the energy storage elements, the controller is provided to control the switching of each switching cell, characterized in that the phase leg of the single phase converter, or each phase leg of the three phase converter, comprises two parallel branches of switching cells, the branches being configured in a closed circuit.