Trigger circuit of water-cooling light-control thyristor of 66 kV

Abstract

The invention relates to a trigger circuit of a water-cooling radiating light-control thyristor valve group of a voltage class more than 66 kV, which triggers a light-control thyristor by adopting a laser trigger signal. The trigger circuit comprises a photoelectric isolation circuit, a pulse circuit 1, a pulse circuit 2, a combiner circuit and a drive circuit, wherein a trigger pulse input signal passes through the photoelectric isolation circuit so that a light signal is converted into an electric signal and is isolated and amplified and also passes through the pulse circuit 1 and the pulsecircuit 2 so that two pulse signals with different fixed widths and different amplitude values are output; and the signals are rectified and then delivered to the combiner circuit so as to form a strong trigger signal and then trigger the light-control thyristor through trigger fibers. The trigger circuit can meet the requirements of a high voltage class, and has good stability, high interferenceresistance and reliability and long service life.

Description

technical field [0001] The invention relates to a trigger circuit of a light-controlled thyristor valve group with water cooling and heat dissipation at a voltage level of 66kV and above, which is applied to electric power, metallurgy and all other fields using light-controlled thyristors as core components. Background technique [0002] The light-controlled thyristor is the most widely used valve element at present. By controlling the firing angle of the light-controlled thyristor, the impedance can be continuously adjusted, which can enhance the power transmission capacity of the system and improve the stability of the power system. It can damp power oscillation and suppress subsynchronous oscillation. , Compensation of power factor and other functions. The light-controlled thyristor valve body usually has to withstand high voltage and high current, which needs to be realized by connecting multiple thyristors in forward and reverse parallel, and then in series. The trigge...

AI Technical Summary

Problems solved by technology

[0004] At present, the voltage level of thyristor valve groups used in China is below 35kV, and they are all triggered by electrical signals, and the triggered pulse circuit is one. There are certain restrictions on the triggering of thyristors with large voltage levels, which will affect the stability of the power system. Reliability, service life, etc. need to be further improved

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