Thyristor-based alternating current quick switch apparatus and control method therefor

Abstract

The invention provides a thyristor-based alternating current quick switch apparatus and a control method therefor. The alternating current quick switch apparatus comprises a bidirectional switch-on branch used for realizing bidirectional switch-on of the working current of an alternating current circuit, a forced transfer branch used for transferring the current of the alternating current circuitin the bidirectional switch-on branch to the forced transfer branch and reducing the current, transferred to the forced transfer branch, of the alternating current circuit to be a zero point, and a power supply and release branch used for supplying power for a capacitor in the forced transfer branch. According to the technical scheme provided by the invention, the thyristor and a diode are mainlyadopted, so that high counter voltage resistance and current resistance is achieved, and millisecond-level switch-on and switch-off of the alternating current quick switch apparatus are realized, thereby further realizing millisecond-level quick switching of the alternating current circuit, and enabling the switch-on and switch-off operating time to reach 1ms; and in addition, the power supply adopts the alternating current power supply, so that local energy utilization can be realized conveniently, and the installation of the apparatus becomes convenient.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a thyristor-based AC fast switching device and a control method thereof. Background technique [0002] The AC switch is a key device in the power system. Its main function is to turn on and off the branch circuit. It plays a vital role in cutting off the disturbance source of the power system, quickly cutting off the load, and preventing the expansion of the power system fault. . [0003] There are three lines of defense for the safety and stability of the power grid, which are: ① The first line of defense is the relay protection for quickly and accurately removing faulty components and the protection for responding to the abnormal operation of the protected equipment without losing the load and quickly isolating faults; ② The second line of defense , in order to ensure the safe operation of the power grid, the safety automatic device allows a small amount of load loss...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the mechanical switch in the prior art that the slow action time is not conducive to the safe and stable operation of the power system, the present invention provides a thyristor-based AC fast switching device, which includes a bidirectional conducting branch for realizing AC line work Bidirectional conduction of current; forced transfer branch for transferring the current of the AC line in the bidirectional conduction branch to the forced transfer branch, and reducing the current of the AC line transferred to the forced transfer branch to zero; and power supply And discharge branch, used to supply power to the capacitor in the forced transfer branch, and realize the discharge of the AC line current, and finally realize the millisecond-level turn-on and turn-off of the AC fast switching device

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