Power conversion control device, power conversion control method, electric motor, and vehicle driving system

摘要

A power conversion control device includes a modulation-wave generating unit generating a modulation wave based on output voltage phase angle command and modulation factor, a carrier-wave generating unit 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 that compares the carrier wave and the modulation wave and generates a switching signal.

主权项

1. A power conversion control device that controls, based on a modulation wave and a carrier wave, a power conversion device that converts direct-current power into alternating-current power, the power conversion control device comprising:
a modulation-wave generating unit that generates a modulation wave based on an output voltage phase angle command and a modulation factor, the modulation factor being calculated based on an output voltage command, and a direct-current voltage supplied to the power conversion device; a carrier-wave generating unit that, in a case of a non-overmodulation state, generates a triangular wave or a saw-tooth wave as the carrier wave, and, in a case of an overmodulation state, generates, as the carrier wave, a signal fixed to −1 in a first section that is a predetermined range centering on a 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 a saw-tooth wave in a remaining third section; and a switching-signal generating unit that compares the carrier wave and the modulation wave and generates a switching signal for controlling the power conversion device.