A method of remote backup protection based on adjacency coordination

Abstract

The invention discloses a remote backup protection method based on adjacency coordination, which belongs to the field of electric power system relay protection. The method includes: obtaining the starting state, action state and electrical quantity of the protection and the adjacent protection, and through the action logic combination proposed by the present invention, to realize natural step-by-step protection of various multi-side (such as T-connection lines, busbars, etc.) protected equipment Coordinated remote backup protection function. The present invention aims at the requirements for remote backup protection in the station domain protection of AC and DC power systems, protection with remote communication capabilities (such as wide-area protection), and protection with wireless communication capabilities (such as 5G communication) in distribution networks. A protection method that relies on the communication master station and does not rely on cumbersome settings to achieve optimal decision-making and adjacency coordination, thereby solving the problem of failure of adjacent circuit breakers, adjacent protection failures, including loss of voltage of adjacent protection control equipment, and the sensitivity of the main protection scheme The main protection cannot reliably remove the fault caused by insufficient and setting errors.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, and more specifically relates to a remote backup protection method based on adjacency coordination. Background technique [0002] Relay protection is the first line of defense to ensure the safety of large power grids. If the protection device cannot operate correctly, quickly and reliably when a fault occurs, it will easily lead to the expansion of the accident and even cause a large-scale power outage. In recent years, the continuous expansion and complexity of power grids and the construction of smart grids have put forward higher requirements for power system relay protection, especially backup protection. [0003] When the main protection fails, the circuit breaker fails or refuses to operate, the fault must be reliably removed by the backup protection. Traditional backup protection generally adopts staged distance protection or zero-sequence overcurrent protection...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a remote backup protection method of adjacency coordination and coordination, the purpose of which is to realize optimal decision-making and adjacency coordination without relying on the communication master station and cumbersome setting. This solves the problem that the main protection cannot reliably remove the fault due to the failure of the adjacent circuit breaker, the failure of the adjacent protection, including the loss of voltage of the adjacent protection control equipment, and the lack of sensitivity of the main protection scheme and setting errors.

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