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Multi-branch fault determination method and system for active distribution network

A technology for fault determination and distribution network, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of strict communication network requirements, large network traffic, and reduce the reliability of differential protection, and achieve low communication network requirements and protection. High sensitivity, fast and accurate determination of the effect

Active Publication Date: 2019-02-22
SHANDONG LUNENG SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A key technology of differential protection is to realize the synchronization and real-time exchange of sampling data on both sides. Data synchronization on each side of a multi-branch active distribution network is a difficult problem, which reduces the reliability of differential protection.
In addition, differential protection needs to transmit real-time sampling values ​​on the network, and the network traffic is particularly large, so the requirements for the communication network will be very strict

Method used

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  • Multi-branch fault determination method and system for active distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In one or more implementations, a multi-branch fault determination system for an active distribution network is disclosed, such as figure 1 shown, including: figure 1 The range between the four switches A, B, C, and D in the box is the protection area range of the multi-branch active power distribution area protection introduced in this paper. The main logic of area protection is integrated in the intelligent terminal of switch A (hereinafter referred to as terminal A), and the intelligent terminals integrated in switches B, C, and D (hereinafter referred to as terminal B, terminal C and terminal D), where terminal D is connected to distributed Type power supply, terminals B, C, D communicate with terminal A through GOOSE, send a blocking signal to terminal A, and receive a trip command from terminal A.

[0033] The area protection described in this embodiment is not a separate protection device, but consists of an action element embedded in terminal A and locking elem...

Embodiment 2

[0039] In one or more implementations, a multi-branch fault determination method for an active distribution network is disclosed, including:

[0040] Assume that the intelligent terminal integrated on switch A communicates with the intelligent terminals of other switches adjacent to switch A in the protection area using the GOOSE communication mechanism, and the area formed by switch A and the other switches is the protection area;

[0041] When the smart terminal integrated on switch A detects a sudden change in the current and the current flows into the protection area, the protection starts;

[0042] Wait for the set time, if the blocking signal from the intelligent terminal of other switches adjacent to switch A in the protection area is not received within the set time, the protection will act and cut off each switch related to the fault area;

[0043] If it receives the blocking signal from the intelligent terminal of other switches adjacent to switch A in the protection...

Embodiment 3

[0047] In one or more embodiments, a multi-branch fault determination terminal of an active distribution network is disclosed. The terminal is used as the intelligent terminal of the switch A in the first embodiment. The intelligent terminal is configured to: when a fault occurs in the area , protection action, cut off the faulty switch; when there is a fault outside the area, if the blocking signal from the intelligent terminal on the other switch adjacent to switch A is received within the set time, the protection will not operate; if only The blocking signal of the intelligent terminal on the distributed power supply side only sends the remote jump command to the terminal on the distributed power supply side.

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Abstract

The invention discloses a multi-branch fault determination method and system for an active distribution network. The method comprises: when an intelligent terminal integrated into a switch A detects asudden change of current and the current flows into a protection area, starting protection; waiting for a set time, if a blocking signal transmitted from the intelligent terminal of another switch adjacent to the switch A in the protection area is not received within the set time, performing a protection operation to cut off respective switches related to a fault area; and if the blocking signaltransmitted from the intelligent terminal of another switch adjacent to the switch A in the protection area is received within the set time, the protection operation is not conducted. The method onlyneeds to transmit a GOOSE signal in the network, and does not need to generate a current voltage signal. Each device individually determines to start or block logic according to the current and voltage. Compared with the differential, the method has a low requirement for a communication network and is easier to implement in a complicated distribution network.

Description

technical field [0001] The invention relates to the technical field of distribution network fault diagnosis, in particular to a multi-branch fault judgment method and system for an active distribution network. Background technique [0002] As a new power generation situation, distributed power generation has gained widespread attention worldwide. However, the access of distributed power generation has changed the structure of the distribution network, and its power flow and fault current may flow in both directions, with uncertainty in magnitude and direction. In this case, the sensitivity and selectivity of the traditional three-stage current protection encounter challenges, and even malfunction or refusal to operate. [0003] The important basis for solving the protection problem of active distribution network is the communication system of distribution network. Optical fiber communication is the main way of communication in urban distribution network. Its main features ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28H02H7/26
CPCH02H7/261H02H7/262H02H7/28
Inventor 孟凡磊王倩倩代后兆刘晓璞侯贺龙王小环
Owner SHANDONG LUNENG SOFTWARE TECH
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