Transformer station domain island protection and backup automatic switching integrated method

Abstract

The invention relates to a transformer station domain island protection and backup automatic switching integrated method. The method is characterized by comprising the following steps: (1), acquiring the electrical amount information and switch state information at the high voltage side, the intermediate voltage side and the low voltage side of a transformer station in real time, and according to whether backup automatic switching upkeep pressure plates are thrown or retreat, identifying the current running states of elements at the high voltage side, the intermediate voltage side and the low voltage side of the transformer station; and (2), according to actual wiring conditions and onsite operation demands, through apparatus function pressure plates, selecting whether the backup automatic switching functions and island protection functions of the high voltage side, the intermediate voltage side and the low voltage side are open; and through apparatus software control words, setting backup switching modes of the high voltage side, the intermediate voltage side and the low voltage side for coupling to the previously identified operation states of the elements at the high voltage side, the intermediate voltage side and the low voltage side of the transformer station, and if coupling fails, sending alarm signals, locking an apparatus and discharging. The method firstly has an island protection function, can rapidly detect an island state and an island scope existing in the transformer station, and jumps away from photovoltaic power station grid connected switches in the corresponding scope.

Description

technical field [0001] The invention relates to a method for integrating anti-islanding protection and standby automatic switching in a substation domain. Background technique [0002] As the load increases and a large number of photovoltaic power sources are connected to the substation, the operational reliability of the substation is becoming more and more important. After the photovoltaic power supply is connected to the substation, once the main power supply of the substation is disconnected and the substation is in an island state, the existence of the photovoltaic power station will cause a high residual voltage on the busbar of the substation, making the operation of the backup self-injection device unable to operate reliably, which will eventually cause the substation A total power outage. Therefore, how to quickly detect the island state on the substation side and cut off the grid-connected switch of the photovoltaic power station has become the key to improving th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a substation domain anti-islanding protection and backup self-switching integration method, which can meet the requirements of 110kV substation for anti-islanding and multi-level backup self-switching, and can also solve the problem of incoming busbar refusal and protection dead zone Faults cause the problem of total shutdown of the substation, thereby preventing the total shutdown of the substation to the greatest extent

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