Active disconnection optimum fracture surface searching method based on electrical distance

Abstract

The invention belongs to the field for reasonably selecting lower isolation places under a large power grid serious fault, and particularly relates to an active disconnection optimum fracture surface searching method based on electrical distance. According to the method, the shortest electrical distance between nodes is obtained through a Dijkstra algorithm, and the nodes are divided into common nodes and general nodes according to the strength of electrical relations between all the nodes; according to the relations between the disconnection fracture surfaces and the common nodes, the searching of the disconnection fracture surfaces is transformed into processing of the common nodes; with the smallest active power unbalanced power in a disconnected subsystem as a target function, the common nodes are searched for based on a width precedence algorithm, and the optimum disconnection fracture surface is obtained. The method has the advantages that the requirement for high speed of online calculation is met, and the method can adapt to changes of the operating mode of the system, and the actively disconnected optimum fracture surfaces can be accurately and effectively captured.

Description

Technical field [0001] The invention belongs to the problem of selecting the splitting section under severe faults in a large power grid, and specifically relates to an active splitting optimal section search method based on electrical distance. Background technique [0002] With the formation of my country's super-large synchronous interconnected power grid, local disturbances generated in a certain place in the system will spread to the entire power grid through the tie line. In order to avoid the occurrence of blackout accidents, out-of-step splitting, as the third line of defense in the power system, is an important means to eliminate grid oscillations and ensure the safe and stable operation of the power system. Out-of-step splitting is mainly divided into passive splitting and active splitting. Passive splitting is a splitting device installed based on offline simulation and operating experience. The device is started based on judging whether the relevant variable exceeds t...

AI Technical Summary

Problems solved by technology

The particle swarm optimization algorithm is used to search for the solution scheme under the constraint conditions, but this method has great difficulties in the process of processing the global optimal solution, and it is easy to fall into the local optimal solution.

Images