A High Speed ​​Acquisition System of DC Transmission Converter Valve Signal

Abstract

The invention discloses a high-speed acquisition system for direct-current transmission converter valve signals, which comprises an acquisition main control module, a GPS module, an optical fiber acquisition module and an electrical signal acquisition module, wherein the acquisition main control module is used for receiving manual and automatic acquisition commands of an industrial control computer so as to control the acquisition modules to carry out acquisition, packing the acquired data and sending the packed data back to the industrial control computer through the gigabit Ethernet, the GPSmodule provides time synchronization so as to keep synchronization with an in-station system, the optical fiber acquisition module comprises an optical splitter module and an optical fiber signal acquisition module, the electrical signal acquisition module comprises a linear optical isolation module and an analog acquisition module, and the optical fiber acquisition module and the electrical signal acquisition module respectively complete the acquisition for optical fiber signals and analog signals. The sampling system is high in sampling rate and sampling speed, and all signals of control and detection circuits are acquired, so that the signals and the communication quality of transmission channels thereof can be monitored in real time, and the operation and maintenance efficiency is improved.

Description

technical field [0001] The invention relates to the field of signal acquisition of a thyristor converter valve, in particular to a high-speed acquisition system of a direct current transmission converter valve signal. Background technique [0002] In recent years, UHV DC transmission projects have achieved leapfrog development. The thyristor converter valve is the core equipment of the DC transmission system. It relies on complex control logic and a huge control loop to realize a series of functions such as conduction, cut-off, and protection. Taking the light-triggered converter valve system as an example, the single-line schematic diagram of its control loop is as follows: image 3 As shown, its working process is roughly as follows: if the voltage across the thyristor exceeds the forward voltage threshold, TVM will send a pulse signal with a certain pulse width to the VBE optical receiving board, and this signal indicates that the thyristor is ready for triggering. When ...

AI Technical Summary

Problems solved by technology

[0003] However, in the operation and maintenance, due to the abnormal control circuit signal, the phenomenon of converter valve failure and switching action occurs from time to time

The control loop often adopts a redundant design, and there are many intermediate signals and components. How to collect loop signals for monitoring, to quickly troubleshoot faults and find abnormalities has always been a difficult problem for operation and maintenance personnel.

Images