The power conversion control device according to the present invention controls a power conversion unit (2) for converting DC power to AC power, on the basis of modulated waves and carrier waves, and is provided with: a modulated wave generation unit (6) which generates modulated waves on the basis of an output voltage phase angle command and a percentage of modulation; a carrier wave generation unit (5) which, if there is not an over-modulated state, generates, as carrier waves, triangular waves or sawtooth waves, and if there is an over-modulated state, generates, as carrier waves, a signal fixed to -1 in a first section which is a specific region centered on a timing corresponding to the peak position of a modulated wave, a signal fixed to +1 in a second section which is the first section having been shifted by half a cycle of the modulated wave, and triangular waves or sawtooth waves in the remaining third section; and a comparison unit (7) which compares the carrier waves and the modulated waves, and generates a switching signal.