Control and monitor method of silicon controlled rectifier converter valve for extreme high voltage direct current power transmission

Abstract

The invention discloses a control and monitor method of a silicon controlled rectifier converter valve for extreme high voltage direct current power transmission. The control and monitor method of the silicon controlled rectifier converter valve for the extreme high voltage direct current power transmission includes: monitoring work status of the silicon controlled rectifier converter valve through a silicon controlled rectifier high potential electronic unit TEU; reporting the work status back to a valve base electronic equipment cabinet VBE through a high voltage optical fiber; for triggering a control signal, sending light trigger pulse signals through the valve base electronic equipment cabinet VBE so as to control the silicon controlled rectifier converter valve; for performing monitor protection, initiatively generating trigger protection through the silicon controlled rectifier high potential electronic unit TEU. Single pulses are adopted in the light trigger pulse signals, and coding standard design of all the pulses adopts the single pulse mode, and therefore pulse coding is simple, the problems that a silicon controlled rectifier is always in a conducting state due to recognition incorrectness of a pulse sequence formed by a plurality of continuous pulses, and then inverting failure, protection failure in a reverse recovery period and the like are caused by the silicon controlled rectifier are solved, and the control and monitor method of the silicon controlled rectifier converter valve for the extreme high voltage direct current power transmission is high in timeliness and reliability.

Description

technical field [0001] The invention relates to a pulse coding system for triggering and monitoring a converter valve, in particular to a method for controlling and monitoring a thyristor converter valve for ultra-high voltage direct current transmission. Background technique [0002] In the direct current transmission project, the thyristor converter valve is the core equipment for mutual conversion of three-phase alternating current and direct current. Thyristor converter valves work in high-voltage and high-current occasions, where the magnetic field and electric field have large interference and high reliability requirements. Therefore, the control and monitoring of converter valves is a key technology in DC transmission technology. Photoelectric conversion technology is usually used to realize signal transmission and isolation of high potential. The triggering and monitoring of thyristors in traditional converter valves uses a five-pulse method to passively monitor the ...

AI Technical Summary

Problems solved by technology

Photoelectric conversion technology is usually used to realize signal transmission and isolation of high potential. The triggering and monitoring of thyristors in traditional converter valves uses a five-pulse method to passively monitor the status of thyristors. When the high potential board detects the status of thyristors, it must send status information to the valve base. Electronic equipment cabinet VBE, VBE sends a pulse sequence to the high potential board according to the reported state information to control and protect the thyristor, and the pulse sequence formed by continuous multiple pulses needs to undergo complicated processing in identification. If the trigger pulse identification is incorrect It can cause the thyristor to be in the conduction state all the time, causing problems such as commutation failure and reverse recovery period protection failure.

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