POWER CONVERSION DEVICE

摘要

A power conversion device including a solar panel, a first DC/DC conversion circuit, a DC/AC conversion circuit connected via a DC bus, a second DC/DC conversion circuit for controlling bus voltage in the case of power outage, a first control section having two kinds of control modes and controlling the first DC/DC conversion circuit, a second control section for controlling the second DC/DC conversion circuit, and a third control section for controlling the DC/AC conversion circuit. The second control section controls bus voltage in the case of power outage, and the first control section switches the control mode based on information of the second control section.

主权项

1. A power conversion device for converting DC power from a distributed power supply and supplying the converted power to a system and a load, the power conversion device comprising:
a first DC/DC conversion circuit for converting first DC voltage outputted from the distributed power supply to second DC voltage; a DC/AC conversion circuit connected to the first DC/DC conversion circuit via positive and negative DC buses, for converting DC voltage to desired AC voltage and outputting the desired AC voltage; a second DC/DC conversion circuit for controlling bus voltage between the DC buses at least in a self-sustained operation; a bus voltage measuring section for measuring the bus voltage; a first control section for drive-controlling the first DC/DC conversion circuit, the first control section having two kinds of control modes of a power control mode for deriving the maximum power of the distributed power supply and a voltage control mode for controlling bus voltage between the DC buses; a second control section for drive-controlling the second DC/DC conversion circuit; and a third control section for drive-controlling the DC/AC conversion circuit, wherein the second control section drive-controls the second DC/DC conversion circuit, based on a measured value of the bus voltage measured by the bus voltage measuring section, to control the bus voltage, in a self-sustained operation, and the first control section switches the two kinds of control modes, based on a measured value of the bus voltage measured by the bus voltage measuring section, in a self-sustained operation.