A multi-level grid coordinated self-healing system and self-healing method

Abstract

The invention relates to the technical field of power systems, more particularly to a multi-stage power grid collaborative self-healing system and self-healing method. A first standby self-switching device receives a protection action signal emitted by a first transformer protection device. A second ring network self-healing device receives the protection action signal of a second line protectiondevice and a bus protection device and the action failure signal of a first section standby self-switching device. A second standby self-switching device receives the protection action signal of a second transformer protection device and the action failure signal of the second ring network self-healing device. A third ring network self-healing device receives the protection action signal of a third line protection device and a third bus protection device and the action failure signal of a second section standby self-switching device. When a short circuit fault occurs in the system, the self-healing system at all stages makes logical judgment according to the collected signals and closes the open-loop point switch to restore power supply to the non-fault power loss area so that the power supply recovery time can be shortened and the workload of fixed value setting can be reduced.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a multi-level grid coordinated self-healing system and a self-healing method. Background technique [0002] At present, many metropolises in my country have entered the ranks of international first-tier metropolises. In these metropolises, the quality of life of residents and the degree of electrification are getting higher and higher. If there is a power outage, it will have a great impact, and reducing the number of power outages and shortening the time of power outages will make a huge contribution to society. The future power system will be widely interconnected, intelligently interactive, flexible, safe and controllable. Fully start to improve the reliability and power supply quality of the urban distribution network. The average annual power outage time of users is no more than 30 minutes, and the power supply can be considered to reach 99.994% respe...

AI Technical Summary

Problems solved by technology

[0003] The existing feeder automation modes that can be applied to actual projects mainly include: master station centralized mode, local differential mode, voltage-time mode, etc. The time of fault isolation and recovery is at the minute level, which cannot meet the power supply of five nines Reliability requirements. Only the intelligent distributed system can meet the power supply reliability requirements of five nines through its millisecond-level fault isolation time and second-level fault recovery time. However, the fault recovery time of the current intelligent distributed feeder automation requires Cooperate with the power restoration operation time of the upper-level power grid. If the power restoration operation time of the upper-level power grid is longer, the fault recovery time of the final distribution network will also be prolonged, which is not conducive to the improvement of power supply reliability.

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