A thyristor voltage monitoring unit for light-controlled converter valve
A technology of voltage monitoring and monitoring unit, which is applied in the direction of measuring current/voltage, measuring device, and measuring electrical variables, etc. It can solve the problems of low detection accuracy, rising temperature of DC voltage equalizing resistance, poor consistency of return signal, etc., and achieve detection accuracy High, convenient adjustment, good effect of return signal consistency
Active Publication Date: 2019-09-27
CHINA XD ELECTRIC CO LTD
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[0005] The purpose of the present invention is to provide a new type of thyristor voltage monitoring unit to solve the shortcomings of existing products such as no reverse recovery period dv / dt detection function, low detection accuracy, poor consistency of return signals, and temperature rise of DC voltage equalizing resistors.
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[0024] Below in conjunction with accompanying drawing and embodiment this mechanism is described in further detail:
[0025] see figure 1 , a thyristor voltage monitoring unit of a light-controlled converter valve, installed at both ends of the thyristor element in the converter valve assembly, including: main circuit board TVM-1, auxiliary sub-circuit board TVM-2, and a shield between the two boards connection line. The shielded connecting wire adopts a coaxial cable, which is used to connect the main circuit board TVM-1 and the auxiliary sub-circuit board TVM-2, and transmit the detection signal of the rate of change of the forward voltage of the thyristor.
[0026] see figure 1 , the main circuit board TVM-1 is connected to the control system of the converter valve through optical fiber, and is responsible for positive and negative voltage and positive overvoltage detection, logic discrimination, return signal generation, photoelectric conversion, and circuit energy acqui...
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The invention discloses a voltage monitoring unit of a light-operated converter valve thyristor. The voltage monitoring unit comprises a main circuit board TVM-1, an attached sub-circuit board TVM-2, and a shield connecting wire between two board cards. The TVM-1 is connected with a converter valve control system by an optical fiber and is responsible for carrying out thyristor voltage detection, return signal generation, logic determination, photoelectric conversion, and circuit energy taking and the like based on application of a complicated programmable logic device technology. The TVM-2 is capable of realizing flexible selection and distribution based on application needs and is responsible for cooperation with the TVM-1 and realizing voltage rate detection at the reverse recovery stage of the thyristor. The voltage monitoring unit has advantages of diversified functions, flexible application, high usage reliability and detection precision, and good return signal consistence.
Description
technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission engineering, and relates to a thyristor voltage monitoring unit of a light-controlled converter valve. Background technique [0002] The thyristor voltage monitoring unit (thyristor voltage monitoring, TVM) is the core component of the light-controlled converter valve equipment. It is mainly used to detect the voltage of the thyristor level, and timely report the voltage monitoring signal through the optical fiber, so as to cooperate with the converter valve control system and realize the control of the thyristor components. Trigger, monitor and protect. [0003] Existing TVM products have simple functions, only have positive and negative voltage establishment and positive overvoltage detection functions, and do not integrate the forward voltage change rate dv / dt detection function during the reverse recovery period. In addition, the existing TVM functions are all...
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IPC IPC(8): G01R19/00
Inventor 苟锐锋刘琦刘飞超崔斌
Owner CHINA XD ELECTRIC CO LTD