Control method for silicon controlled rectifier group, system, triggering device and voltage regulating system
A trigger device and voltage regulation system technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of non-triggering, false triggering, high fusing cost, etc.
Active Publication Date: 2019-09-06
重庆大全泰来电气有限公司
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However, due to the large number of thyristors in this type of voltage regulating equipment, strict trigger design is required. Once a fault occurs during the pulse triggering process, the corresponding thyristor group will appear not triggered, incompletely triggered, falsely triggered, etc. more serious failure
[0003] In order to solve this problem, the existing technology adopts measures such as setting software locking logic and series fast melting protection. Due to the delay of the sampling loop and the scanning cycle of the control chip, the response time of the software locking is relatively long. During this process, the thyristor It is very likely that it has been damaged; and the fast-acting protection has a rated fusing value, and only when the fusing value is reached will the fusing occur, the response time is longer and the fusing cost is higher
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[0051]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0052] In the prior art to deal with the triggering fault, the response time of the software lockout is relatively long, and the thyristor is very likely to be damaged during this process; while the fast-acting protection has a rated fusing value, and the fusing will only occur when the fusing value is reached , the response time is longer and the fusing cost is higher. However, this application obtains the synchronous voltage signal and the initial two pulse s...
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The present application discloses a control method for a silicon controlled rectifier group, a system, a triggering device and a voltage regulating system, and is applied to the triggering device of the silicon controlled rectifier group. The control method comprises the following steps: a synchronous voltage signal at an input terminal of the voltage regulating system is obtained; the synchronousvoltage signal is treated to respectively obtain a first square signal and a second square signal in the synchronous voltage signal corresponding to a forward voltage signal and a backward voltage signal; a first initial pulse and a second initial pulse applied to the silicon controlled rectifier group by a controller are obtained; and the forward voltage signal and the first initial pulse as well as the backward voltage signal and the second initial pulse are respectively subjected to the logic and operation to obtain a first control pulse and a second control pulse, which sequentially act on the first silicon controlled rectifier and the second silicon controlled rectifier. In the logic and operation process of the first square signal and the first initial pulse as well as the second square signal and the second initial pulse, the application filters out mistriggered pulses, completely eliminates the possibility of false triggering of the silicon controlled rectifier group, and improves the reliability of the silicon controlled rectifier group.
Description
technical field [0001] The invention relates to the field of AC voltage regulation, in particular to a control method, system, trigger device and voltage regulation system of a thyristor group. Background technique [0002] Thyristor zero-crossing trigger circuit is widely used in phase-shifting and voltage-regulating equipment due to its advantages of high power factor, low investment cost, and wide range of voltage and current adjustment. When it is actually applied in the phase-shifting and voltage-regulating equipment, the upper computer sends a specific voltage regulation command to the control machine, and the controller sends a trigger control pulse to each trigger device, and each trigger device converts the trigger control signal from an optical signal to an electric signal. The trigger pulse of the signal is sent to the corresponding thyristor group to adjust the on-off of the thyristor. However, due to the large number of thyristors in this type of voltage regula...
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IPC IPC(8): H02M7/17
CPCH02M7/17
Inventor田祥均王清华晋赵泽张滔滔
Owner重庆大全泰来电气有限公司