US 2015/0145328 A1 · DISTRIBUTED POWER SYSTEM AND OPERATION METHOD

Abstract

A distributed power system is designed to continuously supply electric power to a load even when a system voltage of the electric power system becomes abnormal. The distributed power system includes a DC/DC converter to convert DC current generated by solar power generation facility to DC current with a predetermined output voltage, and an inverter to convert the DC current to an AC current which is output to an electric power system via a system interconnect switch. When the system voltage of the electric power system is abnormal, a control device makes the system interconnect switch open to switch operation modes of the DC/DC converter and inverter to a self-sustaining operation without stopping, and supplies electric power to a load connected between the inverter and the system interconnect switch.

Claims8

Dependent claims

A distributed power system, comprising:

a DC/DC converter that converts a direct current generated by a solar power generation facility into the direct current with a predetermined output voltage;
an inverter that converts the direct current converted by the DC/DC converter into an alternating current, and outputs the alternating current to a electric power system via a system interconnect switch;
and
a control device that switches operation modes of the DC/DC converter and the inverter, and makes the DC/DC converter and the inverter shift to a self-sustaining operation without stopping the DC/DC converter and the inverter, when a system voltage of the electric power system is abnormal.

1 more element

An operation method of a distributed power system that converts, by a DC/DC converter, a direct current generated by a solar power generation facility into the direct current with a predetermined output voltage, converts, by an inverter, the direct current converted by the DC/DC converter into alternating current, and outputs the alternating current to a electric power system via a system interconnect switch, the method comprising the steps of:

setting an operation mode of the DC/DC converter to a maximum power point tracking control mode in which electric power generated by the solar power generation facility is the maximum, and setting an operation mode of the inverter to a link voltage constant control mode in which a link voltage between the DC/DC converter and the, inverter is controlled to a predetermined value, when a system voltage of the electric power system is normal;
and
switching the operation mode of the DC/DC converter from the maximum power point tracking control mode to the link voltage constant control mode, and switching the operation mode of the inverter from the link voltage constant control mode to an AC output voltage control mode in which the output voltage of the inverter is controlled to a predetermined value, when the system voltage of the electric power system is abnormal.

Dependencies are inferred from the claim text.

Distributed power system and operation method

Life of this patent

Distributed power system and operation method

Life of this patent

Abstract

Claims8