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

A technology of delay compensation and control method, which is applied in output power conversion devices, electrical components, and AC power input to DC power output, etc., to maintain stability, improve wave generation accuracy, and reduce pulsation and low problems. Effect

Active Publication Date: 2015-03-11
WISDRI WUHAN AUTOMATION
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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 defe

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

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0029] Most existing digital thyristor flip-flops are implemented in the following ways: figure 2 As shown, the AC line voltage synchronization signal corresponding to the natural commutation point is U' AC , U'BA , U' CB and is the actual three-phase AC power line voltage signal, Δt 1 is the actually measured delay time of the sampling circuit, Δt 2 The delay time is the hysteresis link filter processing, and the trigger pulse of the thyristor is a double trigger pulse signal. It can be seen from the figure that the delay time Δt 1 and Δt 2 This kind of trigger control method cannot achieve compensation. The double trigger pulse signal will cause the bus voltage to fluctuate when the load is disturbed, and the DC bus voltage will be low when the load is heavy, which will affect the operating characteristics of the load. In addition, the zero-cro...

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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...

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Application Information

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IPC IPC(8): H02M7/162
Inventor 王傲能余克军康现伟王国强
Owner WISDRI WUHAN AUTOMATION
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