POWER CONDITIONER

摘要

A power conditioner includes first and second power conversion portions, a smoothing capacitor, and an auxiliary power supply. The first power conversion portion is connected to a DC system. The second power conversion portion is connected to an AC system. The capacitor is connected between wires of an intermediate bus which connects input/output terminals of the first power conversion portion and the second power conversion portion. The auxiliary power supply receives commercial power and generates an auxiliary charge voltage to be applied to the capacitor. The first power conversion portion converts DC power of the storage battery to a first DC voltage and outputs the first DC voltage to the intermediate bus. The second power conversion portion converts a voltage of the capacitor to an AC voltage and outputs the AC voltage to the AC system. The auxiliary charge voltage is lower than the first DC voltage.

主权项

1. A power conditioner that is to be provided between a DC system to which DC power is supplied from a DC power supply and an AC system to which commercial power is supplied from a commercial power supply, the power conditioner comprising:
a first power conversion portion to be connected to the DC system; a second power conversion portion to be connected to the AC system; a smoothing capacitor connected to an intermediate bus that connects the first power conversion portion and the second power conversion portion; and an auxiliary power supply configured to receive the commercial power and apply an auxiliary charge voltage to the capacitor, the first power conversion portion being configured to perform at least one-directional power conversion between the DC system and the capacitor, the second power conversion portion being configured to perform at least one-directional power conversion between the AC system and the capacitor, the auxiliary power supply being configured to apply the auxiliary charge voltage to the capacitor before startup of the first power conversion portion and the second power conversion portion, the auxiliary charge voltage being lower than a DC voltage that is applied to the capacitor by the first power conversion portion after startup or by the second power conversion portion after startup.