Thyristor level voltage equalization test method and device
A technology of thyristor level and thyristor, which is applied in the field of thyristor testing, can solve problems such as increased risk of thyristor damage, uneven distribution of thyristor level voltage, damage, etc., to improve operational stability and reliability, and reduce rapid aging or abnormal damage. Effect
Active Publication Date: 2022-03-22
XIDIAN POWER RECTIFIER XIAN +1
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Problems solved by technology
Therefore, the uneven voltage distribution of the thyristor level is currently a difficult problem, and it is urgent to strictly control the voltage equalization of the thyristor level, so as to avoid the increased risk of thyristor damage caused by uneven voltage distribution, or even abnormal damage.
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[0038] 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.
[0039] In the actual application process, due to the deviation of the thyristor production process, aging, and the performance change of the resistance-capacitance element, etc., the impedance of each stage of the thyristor stage may change. At this time, under a certain applied voltage, there will be a Uneven partial pressure. The stage with higher voltage division will bear higher voltage, so it has higher risk. There may be device breakdown, flashover, agin...
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The present application provides a thyristor-level voltage equalization test method and device. During the process of applying a set voltage at both ends of each thyristor, the actual voltage amplitude at both ends of each thyristor and the actual total value of the thyristor cascade circuit are collected. Voltage amplitude, and then based on the set total voltage amplitude, the actual voltage amplitude across each thyristor and the actual total voltage amplitude of the thyristor cascade circuit, determine the voltage equalization distribution value of each thyristor, thereby diagnosing the thyristor stage The abnormal change of impedance and the uniform distribution of voltage of each stage in the circuit can find the uneven voltage distribution of the thyristor stage, reduce the phenomenon of rapid aging or abnormal damage of the thyristor caused by overvoltage, and improve its operation stability and reliability.
Description
technical field [0001] The present application relates to the field of thyristor testing, and more specifically, to a thyristor-level voltage equalization testing method and device. Background technique [0002] Compared with high-voltage AC transmission, high-voltage direct current transmission has the advantages of large transmission capacity, small transmission corridor width, and suitable for long-distance transmission. It is one of the widely used transmission technologies at present. The core link of DC transmission is the rectification and inversion of voltage, and the key device of rectification and inversion is the converter valve. At present, high-voltage converter valves for direct current transmission generally adopt the form of multiple thyristor stages connected in series, and each thyristor stage generally contains 6 to 15 thyristors and resistance-capacitance elements. The voltage equalization of the level thyristors is stable. [0003] In the actual applic...
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IPC IPC(8): G01R31/26G01R19/00G01R27/02
CPCG01R31/263G01R19/0084G01R27/02
Inventor 行鹏李晓昂张鹏立王家琦梅厚启吕玉芳何贤能李毅
Owner XIDIAN POWER RECTIFIER XIAN