Calculation of Thyristor Junction Temperature for Valve Module Considering Branch Length Difference in Parallel Cooling Water Circuit Structure

JIN Ke; LYU Zhongbin; ZHANG Mengxi; ZHANG Shaofeng; XIA Dawei; LI Zhenping; DING Guojun

doi:10.13296/j.1001-1609.hva.2026.09.023

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Calculation of Thyristor Junction Temperature for Valve Module Considering Branch Length Difference in Parallel Cooling Water Circuit Structure

Simulation and Analysis of Thermal and Electromagnetic Characteristics of Power Equipment | 更新时间：2026-09-10

- Calculation of Thyristor Junction Temperature for Valve Module Considering Branch Length Difference in Parallel Cooling Water Circuit Structure
- High Voltage Apparatus Vol. 62, Issue 9, Pages: 228-236(2026)
- 作者机构：
  
  西安交通大学电气工程学院，西安 710049
  国网河南省电力公司电力科学研究院，郑州 450052
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.09.023
  CLC：
- Received：21 April 2026，
  
  Revised：2026-06-18，
  
  Published：16 September 2026
- 稿件说明：
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JIN Ke, LYU Zhongbin, ZHANG Mengxi, et al. Calculation of Thyristor Junction Temperature for Valve Module Considering Branch Length Difference in Parallel Cooling Water Circuit Structure[J]. High Voltage Apparatus, 2026, 62(9): 228-236.
DOI：

JIN Ke, LYU Zhongbin, ZHANG Mengxi, et al. Calculation of Thyristor Junction Temperature for Valve Module Considering Branch Length Difference in Parallel Cooling Water Circuit Structure[J]. High Voltage Apparatus, 2026, 62(9): 228-236. DOI： 10.13296/j.1001-1609.hva.2026.09.023.

摘要

结温是影响晶闸管长期运行可靠性的重要因素，快速准确地计算晶闸管结温对评估晶闸管长期运行的可靠性具有重要意义。为此，文中结合晶闸管换流阀的并联冷却水路结构，分析晶闸管结到冷却液热阻和水流量间关系，提出了一种考虑并联冷却水路结构支路长度差异的阀组件各级晶闸管结温计算方法。首先，基于对晶闸管及散热器结构的分析，获得晶闸管到冷却液的热阻与冷却水流量之间的关系。其次，考虑晶闸管冷却系统的并联水路结构，分析阀组件各级冷却水路的水流量，并结合热阻和水流量的分析结果构建晶闸管结温迭代计算模型。最后，通过实际换流站数据进行结温计算验证，并采用等效电路仿真和有限元仿真验证了文中方法的准确性。

Abstract

Junction temperature is a critical factor affecting the long-term operational reliability of thyristors

and its rapid and accurate calculation is essential for assessing such reliability. Therefore

in this paper the relationship between thermal resistance from the thyristor junction to coolant and water flow rate is analyzed based on the parallel cooling circuit structure of thyristor converter valves

and a junction temperature calculation method for thyristors at all levels of valve assemblies that accounts for branch length variations in parallel cooling circuits is proposed. First

the relationship between thermal resistance from thyristor to coolant and cooling water flow rate is obtained through structural analysis of thyristors and heat sinks. Then

considering the parallel cooling water circuit structure

water flow distribution across different valve assembly levels is analyzed. Moreover

an iterative junction temperature calculation model is developed in combination with thermal resistance and flow characteristics. Finally

the junction temperature calculation is validated using data from an actual converter station

and the accuracy of the proposed method is verified through both equivalent circuit simulation and finite-element simulation.

关键词

Keywords

references

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