Device and method for protection of thyristor set string

Abstract

The present invention discloses a device and a method for protection of a thyristor set string. The device comprises a man-machine interaction module, a main controller, a triggering module, a dynamicmonitoring circuit and a thyristor set string. The man-machine interaction module is connected with the main controller, and the triggering module is connected with the thyristor set string; and thedynamic monitoring circuit is connected with the triggering module and the main controller, and the dynamic monitoring circuit comprises a field-programmable gate array logic gate constructor, a microsecond time divider, a comparator, an imbalance degree determiner, a first optical fiber input device and a first optical fiber output device. The device and the method are provided with the dynamic monitoring circuit to achieve monitoring and protection of thyristors to achieve safety early warning of the thyristors so as to discover transformation of early-stage performance parameters of the thyristors.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a thyristor string protection device and method. Background technique [0002] Thyristor (Thyristor) is the abbreviation of thyristor, also known as silicon controlled rectifier, previously referred to as thyristor; in 1957, General Electric Company of the United States developed the world's first thyristor product, and in 1958 it will be Its commercialization; the thyristor is a PNPN four-layer semiconductor structure, which has three poles: anode, cathode and control pole; the thyristor has the characteristics of a silicon rectifier device, but due to the bottleneck of its own electrical technology, a single thyristor cannot withstand excessive voltage. It is to connect multiple thyristors in series to form a thyristor string, relying on the principle of series voltage division, so that it can work under high voltage and high current conditions, and its working process can be c...

AI Technical Summary

Problems solved by technology

Therefore, the protection of the thyristor is particularly important. In the current prior art, the judgment of the quality of the thyristor is to judge whether it is good or bad by collecting the voltage at both ends of the thyristor and the state quantity generated by the optocoupler. However, this judgment method can only judge Whether the thyristor is good or bad cannot determine the change of the performance parameters of the thyristor

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