| 摘要 |
<p>PROBLEM TO BE SOLVED: To control neutral point potential fluctuation of a voltage-dividing capacitor at high speed and accurately in a power conversion device.SOLUTION: A power conversion device comprises: a plurality of voltage-dividing capacitors connected in series to a DC power supply; a multi-level inverter for converting DC power to AC power by using voltage obtained by dividing voltage of the DC power supply by using the plurality of voltage-dividing capacitors; a voltage detector for detecting both-end voltage of each of the plurality of voltage-dividing capacitors; a PWM control circuit for performing feedback correction by adjusting a pulse instruction for the multi-level inverter on the basis of the voltage detected by the voltage detector; and a balancing circuit for performing adjustment so as to reduce both-end voltage of a voltage-dividing capacitor whose both-end voltage is higher than a set value, of the plurality of voltage-dividing capacitors.</p> |
