Power conversion device

A power conversion device comprising:

• a power conversion circuit configured to convert DC power into three-phase AC power in accordance with a switching control signal;
• and
• a power conversion control circuit configured to generate the switching control signal based on three-phase AC output voltage and three-phase AC output current from the power conversion circuit,
• wherein the power conversion control circuit is configured to
• calculate a positive-phase sequence current command signal based on a positive-phase sequence voltage of the three-phase AC output voltage and a positive-phase sequence current of the three-phase AC output current,
• calculate a first axis negative-phase sequence voltage value being a d-axis component of negative-phase sequence voltage, a second axis negative-phase sequence voltage value being a q-axis component of the negative-phase sequence voltage, a first axis negative-phase sequence current value being a d-axis component of negative-phase sequence current, and a second axis negative-phase sequence current value being a q-axis component of the negative-phase sequence current, by executing dq-conversion of each of a measured value of the three-phase AC output voltage and a measured value of the three-phase AC output current,
• calculate a first axis negative-phase sequence current command value being a d-axis component command value of the negative-phase sequence current based on the second axis negative-phase sequence voltage value,
• calculate a second axis negative-phase sequence current command value being a q-axis component command value of the negative-phase sequence current based on the first axis negative-phase sequence voltage value,
• calculate a negative-phase sequence current command signal based on the first axis negative-phase sequence current command value, the second axis negative-phase sequence current command value, the first axis negative-phase sequence current value, and the second axis negative-phase sequence current value, and
• generate the switching control signal based on the positive-phase sequence current command signal and the negative-phase sequence current command signal.