Research on Thyristor Reverse Recovery Behavior in High-Voltage Direct Current Transmission Converter Valves and Its Application in Integrated Protection Systems

Cao Wen, Liang Song, Yu Huang, Dong Peng, Peng Zhang, Jianquan Liao, Longjie Yang () and Shilin Gao
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Cao Wen: State Grid Sichuan Electric Power Company Ultra High Voltage Direct Current Center, Chengdu 610042, China
Liang Song: State Grid Sichuan Electric Power Company Ultra High Voltage Direct Current Center, Chengdu 610042, China
Yu Huang: State Grid Sichuan Electric Power Company Ultra High Voltage Direct Current Center, Chengdu 610042, China
Dong Peng: State Grid Sichuan Electric Power Company Ultra High Voltage Direct Current Center, Chengdu 610042, China
Peng Zhang: State Grid Sichuan Electric Power Company Ultra High Voltage Direct Current Center, Chengdu 610042, China
Jianquan Liao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Longjie Yang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Shilin Gao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2024, vol. 17, issue 24, 1-19

Abstract: The performance of converter valves is essential for the reliability and efficiency of high-voltage direct current (HVDC) transmission systems. Converter valves consist of multiple thyristor levels, each requiring regular testing to ensure proper functionality. Protective triggering tests play a crucial role in evaluating the safety and performance of these thyristors during maintenance. This study introduces a high-power experimental setup designed to investigate the effects of varying current levels and thermal stresses on the reverse recovery behavior of thyristors—a key performance indicator. Results indicate that the reverse recovery time increases rapidly with higher current levels before reaching a saturation point. Additionally, prolonged exposure to high temperatures significantly reduces both the storage time and the amount of charge recovered during the reverse recovery process. These findings enable the optimization of protective test settings, thereby enhancing the effectiveness of the Thyristor Control Unit (TCU) in protecting converter valves. Improved testing methodologies derived from this research contribute to more reliable maintenance practices and increased overall stability of HVDC transmission systems.

Keywords: HVDC; thyristor reverse recovery; thyristor control unit (TCU); thermal stress accelerated aging; protective test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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