POWER CONVERSION DEVICE AND POWER CONVERSION METHOD

摘要

Provided is a power conversion device in which the size of a smoothing capacitor can be reduced since ripple currents in the respective phases can be compensated each other, so that the size of the device can be reduced. The power conversion device comprises: a plurality of DC power supplies (VB1 to VBn); a smoothing capacitor (C2) connected to each of the DC power supplies (VB1 to VBn) in parallel; a plurality of inverter circuits (22) connected to each of the DC power supplies (VB1 to VBn) by the number of phases in parallel so that the ripple currents occurring upon DC to AC voltage conversion are compensated each other and converting the DC voltages supplied from the connected DC power supplies (VB1 to VBn) to AC voltages; and a control means (31) for controlling the inverter circuits (22). In the power conversion device, the outputs of the inverter circuits (22) connected to the different DC power supplies (VB1 to VBn) are connected in series and output to each phase of a load.