DISPOSITIF DE CONVERSION DE PUISSANCE, SYSTÈME DE CONVERSION DE PUISSANCE ET PROCÉDÉ D'UTILISATION DU SYSTÈME DE CONVERSION DE PUISSANCE

摘要

A power conversion device of embodiments includes arms corresponding to each of three phases. Each arm includes a positive-side arm, a first primary winding, a negative-side arm, and a second primary winding. In the positive-side arm, a plurality of converters including a plurality of switching elements connected in series and a capacitor connected in parallel to the plurality of switching elements connected in series are connected with each other in series, and one end of the positive-side arm is connected to a positive-side DC terminal. The first primary winding is provided between the other end of the positive-side arm and a neutral point, and is magnetically coupled with a secondary winding of a corresponding phase. In the negative-side arm, the plurality of converters are connected with each other in series and one end of the negative-side arm is connected to a negative-side DC terminal. The second primary winding is provided between the other end of the negative-side arm and the neutral point, and is magnetically coupled with the secondary winding common to the first primary winding. The neutral points of the each arm are connected with each other and grounded.