Delay-compensation-based multi-pulse thyristor trigger control method

Abstract

The invention provides a delay-compensation-based multi-pulse thyristor trigger control method. The method comprises the following steps: performing regular intermittent sampling on three alternating current line voltage signals of which phases exceed a natural phase shift point by 60 degrees at a sampling period T; performing hysteresis zero-crossing comparison on the three alternating current line voltage signals and a set hysteresis value to obtain three corresponding zero-crossing signals by virtue of a hysteresis link; obtaining synchronously triggered delay zero-crossing signals of which phases exceed the natural phase shift point by 60 degrees by virtue of a delay compensation link; obtaining an initial moment and a sequence number for driving the emission of six paths of thrystor triggering pulses according to the delay zero-crossing signals; starting performing triggering pulse transmission processing for N times at the period T from the initial moment for the wave emission of the triggering pulses according to a set triggering pulse number N. According to the method, the shortcomings of a conventional digital thyristor trigger are overcome, system running efficiency and reliability can be remarkably improved, and the stability of direct current bus voltage is maintained.

Description

technical field [0001] The invention belongs to the technical field of rectification, and in particular relates to a multi-pulse thyristor trigger control method based on delay compensation. Background technique [0002] Thyristor rectifiers are widely used in a variety of industrial occasions. The trigger of its core component mainly adopts analog or digital control technology. Compared with the analog trigger, the digital trigger achieves smooth start and greatly improves reliability. . At present, most digital flip-flops use the line voltage synchronous signal detection circuit to obtain 3-line voltage zero-crossing signals, obtain 3-line voltage zero-crossing signals through 3 capture units, and then obtain 6 synchronous double trigger pulse signals through 3 timer comparison units , Occupies a large number of capture interrupts and timing interrupt resources of the microprocessor (MCU), resulting in confusion and nesting of capture interrupts and timing interrupts, red...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a multi-pulse thyristor trigger control method based on delay compensation for the defects of existing digital thyristor triggers, which can significantly improve the efficiency and reliability of system operation and maintain the DC bus voltage stability

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