MULTILEVEL POWER CONVERSION DEVICE AND CROSS CURRENT SUPPRESSION CONTROL METHOD OF MULTILEVEL POWER CONVERSION DEVICE

摘要

To suppress a cross current in the entire range of a voltage command value in a multilevel power conversion device in which a plurality of three-level inverter units are connected in parallel.SOLUTION: In a carrier signal generation unit CARRY, two carrier signals having an overlap region overlapping in an amplitude direction are generated. A PWM control unit compares the two carrier signals with a voltage command value Vref and outputs a gate command Gref. According to a cross current between inverter units, a cross current suppression control unit GATE DELAY delays the gate command Gref and outputs it as a gate signal GATE, so that cross currents between a plurality of inverter units are suppressed.SELECTED DRAWING: Figure 2