Power Conversion Device

A power conversion device that performs power conversion between a DC circuit and an AC circuit, the power conversion device comprising:

• a power conversion circuit unit including a plurality of leg circuits corresponding to a plurality of phases of the AC circuit, each of the leg circuits including a plurality of converter cells each having a capacitor and connected in series to each other, each of the plurality of converter cells being a first converter cell including at least two switching elements or a second converter cell including at least four switching elements;
• and
• a control device to control operations of the plurality of converter cells,
• wherein
• the control device
• operates a plurality of the first converter cells that are controlled not based on a circulating current circulating between the plurality of leg circuits as a voltage source that outputs a circulating voltage in a circulating circuit indicating a closed circuit not including the DC circuit and the AC circuit, and
• operates a plurality of the second converter cells to control the circulating current in the circulating circuit.