Switch locking method of high-voltage direct current convertor station

Abstract

The invention provides a switch locking method of a high-voltage direct current convertor station, comprising the following steps of: realizing switch locking on an I / O interface board operated by a direct current control switch in a direct current control protection system, analyzing commands, such as a switch closing command and the like from each control protection host, by a communication module, sending the commands to a CPU module, and receiving commands of controlling and protecting each subsystem send by a field bus by the CPU module; outputting closing signals to switch equipment by connecting the switch closing command and the input end of an and gate; arranging an RS trigger to be connected with received switch locking judgment; when the I / O interface board receives any one switch locking command but does not receive an unlocking command, outputting the switch signals needed locking by the Q end of the RS trigger; when receiving the unlocking command by the I / O interface board, prohibiting outputting the locked switch signals by the Q end of the RS trigger, and connecting the Q end and the other input end of the and gate through a not gate. The invention protects the safety of primary equipment of the direct current convertor station and has simple realization method without increasing the design complexity of the control protection system.

Description

technical field [0001] The invention relates to a control method for a switch in a control and protection system of a direct current converter station, in particular to a method for realizing the locking of the incoming line of the switch in the direct current control and protection system to ensure equipment safety. Background technique [0002] Due to its unique advantages, such as long distance, high power, asynchronous networking, fast power adjustment, power flow controllability, and transmission economy, HVDC transmission has been widely used. [0003] Due to the large investment in the primary equipment of the HVDC transmission system, it is necessary to lock the switches of the AC field, AC filter field, and DC field under certain circumstances to ensure the safety of the switch itself and other primary equipment in the converter station and prevent misuse of the equipment. Cause shock and shorten the service life of the equipment. [0004] In the following situatio...

AI Technical Summary

Problems solved by technology

[0009] The traditional switch locking method, partly relies on manual judgment whether the switch can be operated, which increases the workload of the operator, and there is a certain risk of misoperation; another part is to collect all the influence switch operations at the function of each control switch. The signal is interlocked to determine whether the switch can be operated. This method requires a large amount of signals to be collected for the control and protection system, which increases the complexity of the system.

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