Power generation system

Patent metadata

Field	Value
Publication number	US-10985573-B2
Application number	US-201716614949-A
Country	US
Kind code	B2
Filing date	Sep 11, 2017
Priority date	Sep 11, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

A power generation system includes a plurality of photovoltaic cell panels for outputting DC power, a plurality of inverters for converting DC power into AC power, and a high-order device for communicating with the plurality of inverters. The high-order device is configured to acquire a predetermined power factor, and transmit a command value to each of the plurality of inverters so that the power factor corresponding to the predetermined power factor is achieved by a total output of the plurality of inverters. The high-order device is configured so as to determine a specific inverter that has room to increase the amount of reactive power output from among the plurality of inverters, to transmit a reactive power increasing command value for increasing reactive power to the specific inverter.

First claim

The invention claimed is:

1. A power generation system, comprising:
a plurality of photovoltaic cell panels for outputting DC power;
a plurality of inverters for converting the DC power into AC power; and
a high-order device for communicating with the plurality of inverters,
wherein the high-order device is configured to transmit a command value to each of the plurality of inverters so that a predetermined power factor set in advance is achieved by a total output of the plurality of inverters,
wherein each of the plurality of inverters is configured to control an output amount of active power and an output amount of reactive power based on a received command value, and
wherein the high-order device is configured
to transmit, to a specific inverter having room to increase the output amount of reactive power among the plurality of inverters, a reactive power increasing command value for increasing reactive power, and
to transmit, to at least one of the plurality of inverters other than the specific inverter, an active power increasing command value for increasing active power and decreasing reactive power,

wherein the plurality of inverters includes three or more inverters,
wherein the high-order device is configured to acquire a magnitude of an output reactive power margin, the output reactive power margin is a maximum value of reactive power which each of the plurality of inverters can output,
wherein the high-order device is configured to determine a largest output reactive power margin inverter having a largest output reactive power margin among the three or more inverters,
wherein the high-order device is configured to set the largest output reactive power margin inverter as the specific inverter, and
wherein the high-order device is configured to determine an increase amount of reactive power in order from an inverter whose output reactive power margin is smallest among other inverters other than the largest output reactive power margin inverter until the predetermined power factor is achieved.

Assignees

• Toshiba Mitsubishi Electric Industrial Systems Corp

Inventors

• Mitsugi Yasuaki

Classifications

• H02J2103/00

  Details of circuit arrangements for mains or AC distribution networks · CPC title

• H02J2101/00

  Supply or distribution of decentralised, dispersed or local electric power generation · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J13/14

  the power network being locally controlled, e.g. home energy management systems [HEMS] · CPC title

• Y04S10/123

  the energy generation units being or involving renewable energy sources · CPC title