Detection method and state signal generation device for built-in overvoltage protection of light-controlled thyristor

Abstract

The invention discloses a detection method for built-in overvoltage protection of a light-controlled thyristor and a device for generating a state signal. The steps of the detection method are as follows: 1) when the light-controlled thyristor is subjected to a forward voltage, the voltage state of the light-controlled thyristor is collected and stabilized at Within the stabilized voltage value, the state signal of the thyristor is obtained after shaping, which is converted into an optical signal and sent out; 2) The state signal of the receiving thyristor is ANDed with the trigger control signal and an overvoltage detection result is generated under the control of the detection pulse; (3) Read Obtain the overvoltage detection result to determine whether the overvoltage protection is active; the generating device of the state signal includes: a first detection circuit and a second detection circuit located at both ends of the light-controlled thyristor in each thyristor stage, respectively detecting the corresponding The voltage state of the light-controlled thyristor, and output the state signal of the thyristor. The invention has the advantages of simple realization method, accurate detection result, prolonging the service life of the light-controlled thyristor and convenient judgment.

Description

technical field [0001] The invention relates to the field of thyristors, in particular to a detection method for built-in overvoltage protection of light-controlled thyristors and a device for generating state signals. Background technique [0002] Compared with ordinary thyristors, light-controlled thyristors have two advantages: direct light triggering and built-in overvoltage protection devices, thereby reducing the power consumption of the triggering part and external leads, and solving the problems of electromagnetic interference during triggering. Since its inception, it has been widely used in high-voltage direct current transmission systems and industrial conversion fields with higher reliability requirements and higher working voltage levels. [0003] In SVC (Static Var Compensator, static var compensation device), multiple light-controlled thyristors are used in series. Under normal working conditions, its built-in overvoltage protection device will not operate. Wh...

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Problems solved by technology

[0008] To sum up, the detection method of common thyristor overvoltage protection action in the prior art is not applicable to the optical thyristor, but for the optical thyristor, it is only to judge whether the optical thyristor breaks down, or to roughly determine whether the optical thyristor is broken down by the light of the optical fiber transmitter. Judging whether the photoelectric thyristor is good or bad, but there is no detection for whether the overvoltage protection of the photoelectric thyristor is activated

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