power conversion control device, power conversion control method, electric motor, and vehicle drive system

摘要

A power conversion control device according to the present invention is a power conversion control device that controls, based on a modulation wave and a carrier wave, a power conversion unit (2) converting direct-current power into alternating-current power, includes a modulation-wave generating unit (6) generating a modulation wave based on output voltage phase angle command and modulation factor, a carrier-wave generating unit (5) that, in a case of non-overmodulation state, generates a triangular wave or saw-tooth wave as the carrier wave, and, in a case of overmodulation state, generates, as the carrier wave, a signal fixed to -1 in a first section that is a predetermined range centering on timing corresponding to a peak position of the modulation wave, generates, as the carrier wave, a signal fixed to +1 in a second section obtained by shifting the first section by a half cycle of the modulation wave, and generates, as the carrier wave, a triangular wave or saw-tooth wave in remaining third section, and a comparing unit (7) that compares the carrier wave and the modulation wave and generates a switching signal.