Wide area measurement system based back-up protection method of multi-terminal high-voltage power transmission area

Abstract

The invention discloses a wide area measurement system based back-up protection method of a multi-terminal high-voltage power transmission area, belonging to the technical field of relay protection of electric power systems. In the method, the wide area measurement system based back-up protection of the multi-terminal high-voltage power transmission area and the synchronous real-time measurement on the voltage and current phasors of nodes provided with phasor measuring units are realized through adding centralized decision-making servers by utilizing the wide area measurement system of the multi-terminal high-voltage power transmission area, and a master station and a wide area back-up protecting server carrying out computation and analysis to accurately fix specific fault phases and fault line and issue control commands to execution substations of all lines in the area. The invention can make a decision within at most 200 milliseconds and sends the decision to every execution substation through adding the centralized decision making server and a remote control execution system, thereby realizing the wide area information based back-up protection of the multi-terminal high-voltagepower transmission areas and avoiding the fault of power failure in a large area due to protection misoperation after the fault occurs.

Description

Technical field [0001] The invention belongs to the technical field of power system relay protection, and specifically relates to a backup protection method for a multi-terminal high-voltage power transmission area based on a wide area measurement system. Background technique [0002] After the power grid fails, the line protection in the power system is used to automatically and quickly remove the faulty line and isolate the fault to ensure the safety of people and equipment and the normal operation of the fault-free part. According to the local information of the line, the main protection of the line will immediately open the local circuit breaker when the fault occurs, cut off the local line, and isolate the fault. The line backup protection is used to trip the local or other circuit breakers to isolate the line fault when the main line protection fails or the line circuit breaker fails. However, with the increasing complexity of the grid structure and the increasingly flexib...

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