POWER CONVERSION DEVICE

摘要

In the case of performing self-sustained operation, when power conversion devices supply power to loads, all DC/AC conversion circuits of the power conversion devices are operated in a voltage control mode, and effective voltage (amplitude) of reference AC voltage as a control target for AC power outputted from each DC/AC conversion circuit under voltage control is adjusted in accordance with the power generation amount of a solar panel as a DC power supply, and the state of charge of a storage battery, thereby the amount of power supplied to the loads is controlled.

主权项

1. A power conversion device for converting DC power of a first DC power supply connected outside, to AC power, and supplying the AC power to a load connected to a power system, the power conversion device comprising:
a first DC/DC conversion unit for converting first DC voltage outputted from the first DC power supply, to second DC voltage; an inverter unit which receives the second DC voltage outputted from the first DC/DC conversion unit and converts the received second DC voltage to AC voltage, or converts AC voltage to the second DC voltage; a first DC/DC conversion control unit for controlling the first DC/DC conversion unit; an inverter control unit for controlling the inverter unit; and
an AC voltage target value generating unit for generating a target value for AC voltage serving as a reference for performing voltage control for the inverter unit;wherein the AC voltage target value generating unit determines an AC voltage amplitude as the target value for AC voltage in accordance with a power amount of the first DC power supply when self-sustained operation is performed in the case of being released from the power system, and generates the target value for AC voltage serving as the reference for performing voltage control; the inverter control unit performs voltage control for the inverter unit so that AC voltage having the AC voltage amplitude determined by the AC voltage target value generating unit is outputted from the inverter unit.