Novel method for triggering thyristor for converter valve module test

Abstract

The invention relates to the field of power system devices, in particular to a novel method for triggering thyristor for converter valve module test. The triggering method adopts a digital triggering technology, and VBE (Valve-Based Equipment) receives a synchronous signal and can generate a triggering coded pulse with any phase angle which can be conveniently and flexibly adjusted according to the synchronous signal. The reliable triggering of a thyristor under a low voltage is a basis for ensuring the normal and reliable operation of a converter valve and needs two conditions: (1) the voltage difference between the anode and the cathode of the thyristor is a positive voltage, and (2) the thyristor can be triggered and conducted only when the triggering pulse is received. The triggering pulse for reliably triggering the thyristor under a low voltage is provided by TE (Thyristor Electronics), a low-voltage circuit provides the TE with energy for normal work, the TE receives and decodes the triggering coded pulse from the VBE and then provides a voltage and a current to trigger and conduct the thyristor through a power amplifier so as to trigger and conduct the thyristor.

Description

technical field [0001] The invention relates to the field of power system devices, in particular to a thyristor triggering method for a novel converter valve module test. Background technique [0002] The thyristor is the most important component of the converter valve. Its reliability trigger is the key to ensure the normal operation of the converter valve. During the normal operation of the converter valve, it will be subject to various disturbances from the outside world. The trigger circuit of the thyristor is affected, so that the thyristor cannot be triggered normally. The DC transmission converter valve is composed of multiple sets of thyristors in series. If one thyristor cannot be normally triggered and turned on, the voltage will be shared among the remaining series thyristors, which will cause overvoltage of these thyristors. In severe cases, it may cause damage to the thyristors. , it can be seen that it is particularly important to trigger the thyristor normall...

AI Technical Summary

Problems solved by technology

[0005] Patent CN95207179.7 describes the design of an intelligent thyristor trigger board, which is characterized by a microcomputer host as the core, equipped with multiple analog switches, a conduction angle detection circuit, and an indicator light for operation and failure. The disadvantage is that the key technology needs to use a microprocessor as the core of the whole system, which increases the complexity. The trigger technology needs to detect the conduction angle, which cannot be used as a trigger technology for the converter valve module test.

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