A Thyristor-Based AC Fast Switching Device Parameter Determination Method and Device

Abstract

The present invention provides a method and device for determining the parameters of a thyristor-based AC fast switching device. The conduction time of the AC fast switching device is determined according to the trigger delay time of the thyristors in the third thyristor module and the fourth thyristor module in the bidirectional conduction branch, And according to the first-stage off-time and the second-stage off-time, the off-time of the AC fast switching device is determined, so as to realize the determination of the on-time and off-time of the AC fast switching device. The technical solution provided by the present invention can realize the millisecond-level turn-on and turn-off of the AC fast switching device, and then realize the millisecond-level fast switching of the AC line, and the operation time of the turn-on and turn-off can reach 1ms; and the present invention provides The core components in the technical solution are thyristors and diodes, which have a high level of reverse voltage and current resistance; the power supply in the technical solution provided by the present invention uses an AC power supply, which is convenient for local source and installation of the device, and can meet different applications The scene needs.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and device for determining parameters of a thyristor-based AC fast switching device. 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 smal...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art that the mechanical switch is not conducive to the safe and stable operation of the power system due to its slow action time and cannot meet the needs of different application scenarios, the present invention provides a method and device for determining the parameters of an AC fast switching device based on a thyristor. Among them, the thyristor-based AC fast switching device includes a bidirectional conduction branch, which is used to realize the bidirectional conduction of the working current of the AC line; a forced transfer branch, which is used to transfer the current of the AC line in the bidirectional conduction branch to the forced transfer branch. circuit, and reduce the current of the AC line transferred to the forced transfer branch to zero; and the 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, wherein the parameter determination method of the thyristor-based AC fast switching device is determined according to the trigger delay time of the thyristors in the third thyristor module and the fourth thyristor module in the bidirectional conduction branch. The turn-on time of the fast switching device, and determine the turn-off time of the AC fast switching device according to the turn-off time of the first stage and the turn-off time of the second stage, so as to realize the determination of the turn-on time and turn-off time of the AC fast switching device

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