A kind of automatic locking method of flexible direct current transmission system swap station

Abstract

The invention discloses an automatic locking method for a substation of a flexible direct current transmission system, including: (1) judging the control mode of the station and the operating status of the station and other stations; (2) if the station is in the constant DC voltage control mode, And the station is in the unlocked state while other stations are in the locked state, judge the current running state of the flexible DC system; (3) If the above conditions are met, start the blocking process of the station according to the received system (4) If the reactive power of the current converter station is zero, send a blocking trigger pulse signal to complete the blocking process. The automatic locking method of the present invention realizes the automatic locking of the control and protection system, shortens the locking process of the flexible direct current transmission system, effectively avoids the impact on the AC system caused by the misoperation of the control and protection system caused by human misoperation, and reduces the locking process of the entire flexible direct current system Time-consuming, reducing the complexity of the locking process.

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 whether the double-terminal flexible DC project or the multi-terminal flexible DC transmission project, the entire flexible DC transmission system cannot be automatically locked. Each converter station is responsible for the blocking process of the local converter station. Under the unified deployment of dispatching, each converter station is locked in turn, which inevitably prolongs the entire system lock-up process, and increases the system lock-up process due to individual converter station tripping causing the entire system Risk of tripping. At the same time, in the entire blocking process, human factors dominate, which may cause the constant voltage control c...

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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