Power conversion device

A power conversion device to convert power between an AC circuit and a DC circuit, the power conversion device comprising:

• a plurality of positive-side arm circuits connected between a plurality of AC connections connected to the AC circuit and a positive-side DC terminal connected to the DC circuit;
• a plurality of negative-side arm circuits connected between the plurality of AC connections and a negative-side DC terminal connected to the DC circuit;
• and
• a bypass circuit,
• each of the positive-side arm circuits and each of the negative-side arm circuits each including a plurality of converter cells connected in series,
• each of the converter cells including:
• an energy storage;
• and
• a bridge circuit to switch connection between the energy storage and outside, the bypass circuit including;
• a full-wave rectification circuit connected between the plurality of AC connections, a positive-side intermediate node, and a negative-side intermediate node to convert AC voltages generated at the plurality of AC connections into a DC voltage across the positive-side intermediate node and the negative-side intermediate node and output the DC voltage;
• a positive-side switch connected between the positive-side intermediate node and the positive-side DC terminal, the positive-side switch being capable of switching between conduction and non-conduction between the positive-side intermediate node and the positive-side DC terminal;
• and
• a negative-side switch connected between the negative-side intermediate node and the negative-side DC terminal, the negative-side switch being capable of switching between conduction and non-conduction between the negative-side DC terminal and the negative-side intermediate node.