Thyristor string protection device and method

Abstract

The invention discloses a thyristor string protection device and method. The device includes a human-computer interaction module, a main controller, a trigger module, a dynamic monitoring circuit, and a thyristor string; the human-computer interaction module is connected to the controller, and the trigger module is connected to the thyristor string; the The dynamic monitoring circuit is respectively connected with the trigger module and the main controller, including: a field programmable gate array logic gate builder, a microsecond time divider, a comparator, an unbalance degree determiner, a first optical fiber input device, The first optical fiber output device. The device and method in the present invention can realize the monitoring and protection of the thyristor by setting the dynamic monitoring circuit, achieve the safety early warning of the thyristor, and can detect the deterioration of the early performance parameters of the thyristor.

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 thyristor rectifier, formerly referred to as thyristor; in 1957, General Electric developed the world's first thyristor product, and in 1958 Its commercialization; thyristor is a PNPN four-layer semiconductor structure, it has three poles: anode, cathode and control electrode; thyristor has the characteristics of silicon rectifier devices, but due to the bottleneck of its own electrical technology, a single thyristor can not withstand excessive high voltage. It connects multiple thyristors in series to form a thyristor string. Relying on the principle of series voltage division, it can work under high voltage and large current conditions, and its working process can be controlled. It is widely used in controllable rectification, AC voltag...

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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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