An automatic quasi-synchronous closing circuit for preventing non-synchronous closing of generators

Abstract

The invention discloses an automatic quasi-synchronization closing loop for preventing generator nonsynchronous closing. For nonsynchronous closing accidents in various generator quasi-synchronization modes which appear in a power system, through adding some components and computer monitoring system PLC program modification, the corresponding lock contacts are added in the automatic quasi-synchronization closing loop, two different control cables are employed to allow each lock contact to be in series connection at a synchronous switch side, and thus the generator automatic quasi-synchronization closing loop is improved. According to the automatic quasi-synchronization closing loop, a problem of nonsynchronous closing accidents caused by the currently appeared conditions of turn-on misoperation in the time when a synchronization device is not started, wrong switch off of a synchronization device in the time when the synchronization device is started and a synchronization closing circuit cable fault is effectively solved, and the correct and reliable operation of a generator automatic quasi-synchronization network connection is ensured.

Description

technical field [0001] The invention belongs to the technical field of synchronous grid-connection of generators in power systems, and relates to an automatic quasi-synchronous closing circuit for preventing non-synchronous closing of generators proposed for the phenomenon of non-synchronous closing of generators. Background technique [0002] In view of the non-synchronous closing failure phenomenon in the automatic quasi-synchronous closing process of power system generators, most of them are synchronous device problems, but there are also control loop problems. People often pay attention to the reliability of the synchronous device itself, and ignore In order to optimize the closing control loop, no measures have been taken from the control loop to prevent misoperation or false closing. [0003] In the asynchronous closing accidents that have occurred, such as the secondary cable insulation damage of the control circuit of a certain factory outlet circuit breaker in Shanx...

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Problems solved by technology

[0003] In the asynchronous closing accidents that have occurred, such as the secondary cable insulation damage of the control circuit of a certain factory outlet circuit breaker in Shanxi Province in 1997, which caused an instantaneous breakdown between the cable core wires, and the closing circuit was connected, resulting in a non-synchronous generator. Closing and grid connection accident; in 2010, a power plant in Inner Mongolia misoperated the "start synchronous button" to "switch and close button", which led to the non-synchronous closing and grid connection accident of the generator, etc., all of which were closed directly without any locking cause after closing

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