Distribution network asymmetric fault in-situ positioning method based on distributed power supply information

A technology of distributed power supply and positioning method, applied in the direction of fault location, fault detection according to conductor type, etc., can solve the problems of difficulty in fault location of distribution network, large limitation of branch line and distribution network automation level, etc., and achieve easy acquisition. , to ensure the feasibility and the effect of expanding the scope of application

Active Publication Date: 2022-02-11
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] The present invention aims at at least solving the difficulty of fault location in the distribution network due to the access of distributed power sources in the prior art. The fault location is greatly affected and limited by the distribution network's branch lines, distribution network automation level, and communication conditions. The technical problem that the sensitivity and application scope of the existing fault location technology have certain limitations

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  • Distribution network asymmetric fault in-situ positioning method based on distributed power supply information
  • Distribution network asymmetric fault in-situ positioning method based on distributed power supply information
  • Distribution network asymmetric fault in-situ positioning method based on distributed power supply information

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specific Embodiment

[0067] In this specific embodiment, the schematic diagram of the structure of the 10kV power distribution network with distributed power is as follows: figure 2 shown. Among them, T 1 main transformer, T 2 is the grounding transformer, DG is the distributed power supply, and the neutral point grounding resistance R 0 is 10Ω. The feeder positive sequence parameter is: R 1 = 0.031Ω / km, L 1 =0.096mH / km, C 1 =0.338μF / km, the zero sequence parameter of the feeder is: R 0 = 0.234Ω / km, L 0 = 0.355mH / km, C 0 = 0.265 μF / km. Feeder 1 is connected with distributed power supply DG at 3km and 7km respectively 11 、DG 12 , feeder 2 is connected with distributed power supply DG at 4km 21 , feeder 3 is connected with distributed power supply DG at 4km 31 , feeder 4 is connected with distributed power supply DG at 1km and 5km respectively 41 、DG 42 , the feeder 5 is connected to the distributed power supply DG at 3km 51 . The distributed power capacity is 0.2MW.

[0068] The ...

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Abstract

The invention provides power distribution network asymmetric fault in-situ positioning method based on distributed power supply information. The method comprises the following steps: acquiring a three-phase voltage amplitude of a bus of a power distribution network, a positive sequence voltage of each distributed power supply grid-connected point and an outgoing line positive sequence current of each distributed power supply grid-connected point in real time; judging whether the power distribution network has an asymmetric fault according to the three-phase voltage amplitude of the bus of the power distribution network; calculating the positive-sequence equivalent impedance of the downstream of the distributed power supply before the fault; calculating the downstream positive-sequence equivalent impedance of the distributed power supply after the fault; calculating a positive sequence equivalent impedance ratio at each distributed power supply; and comparing the positive sequence equivalent impedance ratio with a setting value, judging a fault section, and outputting the position of the fault section.

Description

technical field [0001] The invention relates to the technical field of distribution network fault location, in particular to an on-site location method for distribution network asymmetric faults based on distributed power supply information. Background technique [0002] With the increasing penetration of distributed power in the distribution network, the distribution network is also changing from the traditional radial single power structure to the multi-source and multi-ring structure. The distribution network is an important part of the power system that directly faces users, and safe and reliable power supply is one of its core goals. The distribution network is the most fault-prone part of the entire power system, and the outage time caused by its fault accounts for the highest proportion, and the asymmetric fault of the distribution network accounts for more than 95% of the total faults. If the fault is not dealt with in the first time, it will lead to a long power ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 黄飞肖扬高晋欧阳金鑫戴健刘佳王谦夏磊向洪廖庆龙吴晓东岳鑫桂范昭勇戴晖刘志宏李鑫宫林
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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