Invention Grant
US09246407B2 Voltage balancing system and method for multilevel converters 有权
多电平转换器的电压平衡系统和方法

Voltage balancing system and method for multilevel converters
Abstract:
A method of operating a flying capacitor multilevel converter having a direct current link and a plurality of phase legs each having a plurality of flying capacitors includes employing redundant states to balance flying capacitor voltages by charging or discharging flying capacitors. The redundant states are employed by obtaining a load current of the flying capacitor multilevel converter. If a load current value is lower than a threshold value then a capacitor current of a phase terminal capacitor is utilized to determine redundant states else a load current direction is utilized to determine the redundant states.
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