An island detection method for distribution network based on wide-area information

A technology of island detection and wide-area information, applied in the field of power systems, can solve problems such as insufficient sensitivity and strong interference effects, and achieve the effect of strong engineering application value

Active Publication Date: 2016-06-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing passive islanding detection method, which are insufficient in sensitivity and relatively affected by interference, and provide a distribution network islanding detection method based on wide-area information

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  • An island detection method for distribution network based on wide-area information
  • An island detection method for distribution network based on wide-area information
  • An island detection method for distribution network based on wide-area information

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Embodiment Construction

[0019] The present invention proposes a distribution network island detection method based on wide-area information, and the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] The detection principle of the present invention: for DG, when the distributed power supply side load changes the same, the frequency change value caused by the parallel operation of the power grid and the islanding effect is different. During grid-connected operation, the frequency adjustment ability is strong, and the corresponding frequency change is small, and the frequency of the subsystem is the same as the grid frequency; when the island effect occurs, the frequency adjustment ability of subsystem 1 is weak, and the corresponding frequency change is relatively large, while At this time, the grid frequency basically does not change. By comparing T=Δf 1 / ΔP L1 -Δf S / ΔP S with the set T 0 size to determine whether islands ...

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Abstract

The invention discloses a method for power distribution network island detection based on wide-area information. According to the method, the difference value T between the ratio of the local load-side frequency change quantity delta f1 and the power change quantity delta PL1 and the ratio of the power-grid-side frequency change quantity delta fS and the power change quantity delta PS serves as a detection index and occurrence of the island state is judged through multiple times of detection and comparison between the difference value T and the set threshold value T0. The method is simple in principle, wide in application range, capable of avoiding fault operation under disturbance of power grid voltage fluctuation, different kinds of load switching and the like, the island phenomenon can be rapidly and accurately detected on different load conditions, and the engineering practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for detecting isolated islands of distribution networks based on wide-area information. Background technique [0002] Most of the traditional islanding detection methods of distribution network are aimed at detecting single-ended quantities. When the distributed power (DG) output power matches the load power, that is, the power provided by the grid is zero, even if the island effect occurs, the output voltage or frequency changes little, and the protection circuit will detect that the voltage and frequency do not exceed the normal range The outbreak of the remote island does not occur. At present, the detection blind zone of the existing passive detection methods is generally greater than 2%, that is, the power mismatch is less than 2%, and the failure occurs. Contents of the invention [0003] The purpose of the present invention is to ove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 刘建李晓博刘春秀王森
Owner STATE GRID CORP OF CHINA
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