A static switch control method
A technology of static switch and control method, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of burnt switch, cycle lag, inability to meet switching time requirements, etc., and achieve the effect of reducing switching time and improving stability.
Active Publication Date: 2020-09-22
AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD
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Problems solved by technology
The static switch is controlled and switched by the controller. Under normal circumstances, the static switch can be switched instantaneously when the controller detects a voltage change without an inductive load. However, when there is an inductive load, the voltage and current in the grid are out of phase. In this case, the period of the current lags behind the voltage. If it is detected that the voltage change needs to be connected to the dynamic voltage restorer, turning on the static switch immediately will cause the common conduction problem of the bidirectional thyristor as the switch, and a large Current burning switch, however, if the delay time is preset, it cannot meet the switching time requirements of the dynamic voltage restorer connected to the grid
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the invention and should not be seen as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0028] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, not for Describe a specific order.
[0029] In the claims, specification and above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation words, such as using the terms "center", "transverse", "longit...
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The invention discloses a static switch control method for protecting a static switch on a circuit with an inductive load against a common-state on state. The method comprises detecting a phase difference between the current and the voltage; using different control means for power failure, rapid undervoltage, and slow undervoltage; determining whether the voltage and the current are in the same direction in the case of undervoltage according to the obtained phase difference so as to avoid turning on the static switch at a DVR end when the voltage and the current are in different directions, thereby avoiding the common-state on state of the static switch. Further, the method shortens the switching time by accurately determining the switching timing.
Description
technical field [0001] The invention relates to the technical field of electronic switches, in particular to a static switch control method. Background technique [0002] Dynamic Voltage Restorer, or DVR, is an effective series compensation device used to keep the supply voltage of sensitive loads stable. It is still within the acceptable range when disturbed by the system voltage. [0003] In order to control the access of the dynamic voltage restorer to the power grid when voltage fluctuations are detected, static switches are installed on the grid line and the series line of the dynamic voltage restorer. The static switches currently used are generally bidirectional thyristor. The static switch is controlled and switched by the controller. Under normal circumstances, the static switch can be switched instantaneously when the controller detects a voltage change without an inductive load. However, when there is an inductive load, the voltage and current in the grid are ou...
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IPC IPC(8): H02H7/26
Inventor 叶彬城陈福孟超陈文全
Owner AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD