Power system stabilizing device

Patent metadata

Field	Value
Publication number	US-9768786-B2
Application number	US-201414585299-A
Country	US
Kind code	B2
Filing date	Dec 30, 2014
Priority date	Jan 9, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A power system stabilizing device includes an arithmetic unit that constructs a system model by collecting various kinds of system information, calculates a transient stability under an assumed accident condition beforehand, and selects, for each assumed accident in advance, a target solar power generator for shutdown and a target power generator to be disconnected to stabilize a power system, and a control unit that shutdowns the shutdown target solar power generator and disconnects the disconnection target power generator from the power system which are selected by the arithmetic unit when a system accident occurs.

First claim

What is claimed is:

1. A power system stabilizing device for stabilizing a power system installed with a plurality of power generators and a renewable energy power generator, the device comprising:
an accident detection device that detects an occurrence of accident;
an information collection device that acquires system information including a voltage, an effective power, a reactive power, and an ON/OFF condition of a breaker;
an arithmetic unit that constructs a system model based on the information of the power system acquired by the information collection device, calculates a transient stability for all assumed conditions beforehand, and selects, to stabilize the power system for each accident assumed to occur, a target renewable energy power generator to be shutdown and a target power generator;
a control unit that disconnects the power generator and the renewable energy generator that are selected beforehand by the arithmetic unit when the accident detection device detects the accident of the power system,
wherein the arithmetic unit narrows down candidates of the renewable energy power generator to be shutdown based on a calculation result of a change amount of a power generator active power under a condition which the renewable energy power generator is shutdown,
wherein the arithmetic unit selects the target renewable energy power generator to be shutdown, while selecting the power generator to be disconnected in accordance with a change amount of an internal phase angle of the power generator calculated from the power generator active power and a power generator constant after the occurrence of the accident.

2. The power system stabilizing device according to claim 1 , wherein the control unit transmits, prior to the occurrence of the accident, to the target renewable energy power generator to be shutdown selected by the arithmetic unit, a shutdown condition of the target renewable energy power.

Assignees

• Toshiba Kk

Inventors

• Kimura Misao
• Ishihara Yuji

Classifications

• H02J3/381

  Dispersed generators · CPC title

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• H02J2101/22

  Solar energy · CPC title

• H02J2101/20

  Dispersed power generation using renewable energy sources · CPC title

• H02J3/04 Primary

  Arrangements for connecting networks of the same frequency but supplied from different sources · CPC title