An adaptive protection method for distribution network based on action time coordination and directional elements

Abstract

The embodiment of the invention discloses a distribution network adaptive protection method based on operation time matching and directional elements. The method comprises the following steps: step S10, setting the protection operation current according to the principle of maximum load current of the line; Step S11, according to the topology structure of the whole distribution network, each substation, distribution station, switch station and each line are regarded as a node, and the circuit breaker or current transformer on each line is regarded as a side; And each node and edge are numberedto obtain the directed graph of the whole distribution network; Step 12, generating a complete incidence matrix M and an adjacency matrix C of the directed graph accord to the directed graph; Step S13, obtaining the lower protection of each protection in the distribution network topology according to the complete correlation moment matrix M and the adjacency matrix C of the directed graph; Step S14, adjusting the protection operation time of each protection according to the ladder principle; and Step S15, selecting directional elements to be provided at a part of the edges. The embodiment of the invention can protect the full length of the line, has high sensitivity, and improves the power supply reliability of the distribution network user.

Description

technical field [0001] The invention relates to the field of relay protection for power supply networks, in particular to an adaptive protection method for distribution networks based on action time coordination and directional elements. Background technique [0002] With the development of social economy and the extensive application of high-tech digital equipment, the economic losses and adverse effects caused by power supply interruptions to the society are also increasing, and users have higher and higher requirements for power supply reliability, which brings power supply enterprises new challenges. For a long time, the protection and control level of the distribution network has been seriously inconsistent with the development requirements of the smart grid, mainly in: (1), the management and maintenance of the distribution network are complicated, and the workload is huge; (2), the number of distribution network equipment is huge, And the standardization of equipment...

AI Technical Summary

Problems solved by technology

[0004] However, traditional distribution network protection cannot meet the requirements of closed-loop operation for smart distribution networks: for example, in some high-tech parks, in order to meet the requirements of high power supply reliability and high power quality, the 20kV distribution network ring network power supply mode is adopted

Obviously, the distribution network power flow is no longer a one-way flow, and the current non-directional three-stage current protection no longer meets the operational requirements

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