Island detection method and device for electric power system

A power system and islanding detection technology, applied in the field of electric power, can solve the problem of large dead zone area for islanding detection, and achieve the effect of reducing the dead zone area of ​​islanding detection

Inactive Publication Date: 2015-06-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0010] The main purpose of the present invention is to provide an islanding detection method and device for power systems to solve the problem of relatively large dead zone areas for islanding detection in power systems in the related art

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  • Island detection method and device for electric power system
  • Island detection method and device for electric power system
  • Island detection method and device for electric power system

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[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0030] It should be noted that the terms "first" and "second" in ...

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Abstract

The invention discloses an island detection method and device for an electric power system. The island detection method for the electric power system comprises the steps of calculating the frequency change rate of the distributed electric power system, calculating a voltage difference value of the distributed electric power system, comparing the frequency change rate and a first threshold value and comparing the voltage different value and a second threshold value, and detecting that the island effect exists in the electric power system if the frequency change rate is larger than the first threshold value and the voltage difference value is smaller than the second threshold value. By means of the method and the device, the problem that in the related technology, an island detection dead zone is too large in the electric power system is solved, and then the effect of reducing the island detection dead zone in the electric power system is achieved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an islanding detection method and device for a power system. Background technique [0002] The island effect is that when the power supply system of the power company stops working due to failures, accidents or power outage maintenance, the distributed power system installed at each user end fails to detect the power outage in time and cannot quickly cut itself off from the mains network. A self-sufficient power supply island phenomenon that the power company cannot control is formed by the distributed power system to supply power to the surrounding loads. Generally speaking, the island effect may have adverse effects on the entire power distribution system equipment and user-side equipment, including: [0003] 1) Endanger the life safety of electric maintenance personnel; [0004] 2) Affect the protection switch action program on the power distribution system; [0005] 3) The un...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 王海云孙健钱叶牛杨楠刘慧珍王存平张岩张再驰
Owner STATE GRID CORP OF CHINA
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