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This paper presents a detection method of input phase lack of power unit in cascaded high voltage inverter. The method determine the input phase lack of power unit in cascaded high voltage inverter through the detection of primary negative sequence current of phase shifting transformer. The start-up threshold is set by the negative sequence input current of the cascaded high voltage inverter and input phase lack is judged by the actual output power. The new phase detection method does not need to add extra circuit of all power units to realize the phase detection in input side of each power unit, so that the complexity of fault detection circuit is reduced, thus the reliability of high voltage converter is increased. Keywords-component; Cascaded High Voltage Inverter; Phase Lack; Power Unit

A New Method for Detecting Input Phase Lack of Power Unit in Cascade High Voltage Inverter