Automatic locking method for battery replacement station of flexible direct-current transmission system

Abstract

The invention discloses an automatic locking method for a battery replacement station of a flexible direct-current transmission system. The automatic locking method includes the steps of firstly, judging the control mode of the station, the running state of the station and the running states of other stations; secondly, judging the current running state when the flexible direct-current system runs if the station is judged to have the direct-current voltage control mode, the station is in the unlocked state and meanwhile other stations are all in the locked state; thirdly, starting the locking process of the station according to a received system locking control instruction if all the conditions are met, and conducting reactive power reduction control; fourthly, sending a window signal to complete the locking process if the reactive power of the convertor station is zero at present. By means of the automatic locking method, a control and protection system is automatically locked, the locking process of the flexible direct-current transmission system is shortened, impact which is caused by control and protection system incorrect operation generated due to man-made incorrect operation and the like to an alternating-current system is effectively avoided, time consumption of the whole locking process of the flexible direct-current system is lowered, and the complexity in the locking process is lowered.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, and in particular relates to an automatic locking method for a switching station of a flexible direct current transmission system. Background technique [0002] In the existing flexible DC transmission projects, no matter the double-terminal flexible DC transmission project or the multi-terminal flexible DC transmission project, it is impossible to automatically realize the blocking of the entire flexible DC transmission system. Each converter station is responsible for the lockout process of the converter station at its own end. Under the unified deployment of dispatching, each converter station is locked in turn, which inevitably prolongs the lockout process of the entire system, and increases the tripping of individual converter stations during the system lockout process. Trip risk. At the same time, in the whole blocking process, human factors play a dominant role, which m...

AI Technical Summary

Problems solved by technology

[0002] In the existing flexible DC transmission projects, regardless of the double-terminal flexible DC transmission project or the multi-terminal flexible DC transmission project, it is impossible to automatically realize the blocking of the entire flexible DC transmission system

Each converter station is responsible for the lockout process of the converter station at its own end. Under the unified deployment of dispatching, each converter station is locked in turn, which inevitably prolongs the lockout process of the entire system, and increases the tripping of individual converter stations during the system lockout process. trip risk

At the same time, in the whole blocking process, human factors play a dominant role, which may cause the fixed voltage control converter station to be blocked before the constant active power control converter station in the flexible DC system, resulting in malfunction of the control and protection system and affecting the stable operation of the AC and DC system.

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