Method for quickly cutting off loads locked by ultra-high-voltage direct current in batches in concurrence manner

Abstract

The invention discloses a method for quickly cutting off loads locked by ultra-high-voltage direct current in batches in a concurrence manner. A power grid dispatching automation system serves as a foundation, a switch sequence is selected according to a selection strategy and a filtering condition, a multi-turn control and standby channel control method is adopted, multi-turn control time intervals are adjusted flexibly, batch load cutting-off control success rate is increased greatly, batch loads are cut off quickly by a single-station serial and multi-station parallel combined remote-control mode, batch remote control efficiency is greatly improved, millions of loads can be cut off in minutes, the loads can be quickly controlled in batches on the premise that the safety and the accuracy are ensured when ultra-high-voltage direct current locking fails, and safe and stable running of a power grid is guaranteed.

Description

technical field [0001] The invention relates to a batch fast and concurrent removal method of loads after UHV DC blocking, and belongs to the technical field of electric power system dispatching automation. Background technique [0002] In order to cope with the impact on the reliability of power grid operation caused by the loss of UHV DC high power, realize the rapid load control under UHV DC blockage, improve the emergency handling ability of dispatching in response to UHV DC blockage, and improve the leanness of load control To ensure the safe operation of the power grid, it is urgent to study a safe, accurate and fast load batch rapid control method. [0003] At present, the load batch control method provided by the domestic power grid dispatching automation system is group control operation. Relying on group control operation, the dispatcher can realize remote batch control of each switch in the plant and station. Compared with the traditional power cut work, it saves ...

AI Technical Summary

Problems solved by technology

The traditional group control software adopts a serial operation strategy, and the batch remote control of multiple plant and station switches is executed sequentially, and the control speed is slow when a large number of loads are shed, which cannot meet the requirements of rapid load shedding in batches in the case of UHV DC blocking faults

In addition, the traditional group control software does not support the remote operation of the failed switch directly after the batch control is completed, and the control sequence needs to be reselected, which increases the total time of batch load shedding to a certain extent.

[0005] 2) Low control success rate

Due to the different devices of each substation, the response speed to the control command is different, and the traditional group control software cannot flexibly adjust the equipment control time interval of each plant station, especially some old stations respond slowly, and the previous control cancellation command has not yet been completed. After the end, the next switch preset command is received, which leads to the failure of the control of the whole station equipment and greatly reduces the success rate of control

In addition, the traditional group control software does not support switching to the backup channel to issue commands after the main channel control fails, which also reduces the success rate of control to a certain extent.

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