Remote backup protection method based on adjacent cooperative cooperation

Abstract

The invention discloses a remote backup protection method based on adjacent cooperative cooperation, and belongs to the field of power system relay protection. The method comprises the following steps: acquiring starting states, action states and electrical quantities of the protection and adjacent protection, and realizing a natural step-by-step matched remote backup protection function on protected equipment on various sides (such as T-connection lines, buses and the like) through action logic combination provided by the invention. The invention provides a protection method which does not depend on a communication master station and does not depend on tedious setting to realize optimal decision and adjacency cooperation in allusion to requirements on remote backup protection in alternating current and direct current power system station domain protection, protection (such as wide area protection) with remote communication capability and protection with wireless communication capability (such as 5G communication) of a power distribution network. Therefore, the problem that main protection cannot reliably remove faults due to the failure of adjacent circuit breakers, failure of adjacent protection including the voltage loss of adjacent protection control equipment, insufficient sensitivity of a main protection scheme, setting errors and the like is solved.

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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