Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect
High-frequency harmonic current leads to temperature increases and uneven stress distribution within ultra-high-voltage (UHV) converter transformer windings. This paper presents a simulation study that explores the stress distribution characteristics in UHV converter transformer windings, taking int...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-04-01
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| Series: | International Journal of Electrical Power & Energy Systems |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525000560 |
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| author | Jing Xu Jian Hao Ning Zhang Ruijin Liao Yun Feng Wenlong Liao Huanchao Cheng |
| author_facet | Jing Xu Jian Hao Ning Zhang Ruijin Liao Yun Feng Wenlong Liao Huanchao Cheng |
| author_sort | Jing Xu |
| collection | DOAJ |
| description | High-frequency harmonic current leads to temperature increases and uneven stress distribution within ultra-high-voltage (UHV) converter transformer windings. This paper presents a simulation study that explores the stress distribution characteristics in UHV converter transformer windings, taking into account the thermal effects of harmonic current. The research developed a two-dimensional (2D) refined simulation model integrating electromagnetic, thermal-fluid, and solid mechanics fields to analyze the temperature distribution patterns influenced by harmonic currents. The study investigated the influence of temperature rise on the stress distribution within the windings, analyzing the effects of harmonic current content and frequency on the maximum stress values. Finally, the study proposed and validated a novel winding stress calculation model that incorporates the effects of harmonic current and their associated temperature rise. The results demonstrate that hotspot temperatures on both the grid and valve side windings increase as a power function of harmonic current content and exponentially with frequency. Following the inclusion of thermal rise effects, the stress in the grid-side and valve-side windings shifts towards the oil channels between the two windings and also spreads from the hotspot temperature regions to the central regions of the windings. Maximum stress changes under varying harmonic frequencies follow a power function growth pattern. Stress values from the proposed model, considering thermal effects, deviate by less than 5% from those calculated using multi-field coupling simulation. This study provides essential guidance for the design and maintenance of UHV converter transformer windings under new power system operating conditions. |
| format | Article |
| id | doaj-art-34c054b123084513997dec43eb414c30 |
| institution | Kabale University |
| issn | 0142-0615 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Electrical Power & Energy Systems |
| spelling | doaj-art-34c054b123084513997dec43eb414c302025-02-06T05:10:56ZengElsevierInternational Journal of Electrical Power & Energy Systems0142-06152025-04-01165110505Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effectJing Xu0Jian Hao1Ning Zhang2Ruijin Liao3Yun Feng4Wenlong Liao5Huanchao Cheng6State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044 Chongqing, ChinaState Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044 Chongqing, China; Corresponding author.State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044 Chongqing, ChinaState Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044 Chongqing, ChinaState Grid Sichuan Electric Power Company Electric Power Research Institute, Sichuan 610000 Sichuan, ChinaState Grid Sichuan Electric Power Company Electric Power Research Institute, Sichuan 610000 Sichuan, ChinaChina Electric Power Research Institute Co., Ltd, Beijing 100192 Beijing, ChinaHigh-frequency harmonic current leads to temperature increases and uneven stress distribution within ultra-high-voltage (UHV) converter transformer windings. This paper presents a simulation study that explores the stress distribution characteristics in UHV converter transformer windings, taking into account the thermal effects of harmonic current. The research developed a two-dimensional (2D) refined simulation model integrating electromagnetic, thermal-fluid, and solid mechanics fields to analyze the temperature distribution patterns influenced by harmonic currents. The study investigated the influence of temperature rise on the stress distribution within the windings, analyzing the effects of harmonic current content and frequency on the maximum stress values. Finally, the study proposed and validated a novel winding stress calculation model that incorporates the effects of harmonic current and their associated temperature rise. The results demonstrate that hotspot temperatures on both the grid and valve side windings increase as a power function of harmonic current content and exponentially with frequency. Following the inclusion of thermal rise effects, the stress in the grid-side and valve-side windings shifts towards the oil channels between the two windings and also spreads from the hotspot temperature regions to the central regions of the windings. Maximum stress changes under varying harmonic frequencies follow a power function growth pattern. Stress values from the proposed model, considering thermal effects, deviate by less than 5% from those calculated using multi-field coupling simulation. This study provides essential guidance for the design and maintenance of UHV converter transformer windings under new power system operating conditions.http://www.sciencedirect.com/science/article/pii/S0142061525000560Transformer windingsHarmonic currentStress characteristicsMulti-physical field simulation |
| spellingShingle | Jing Xu Jian Hao Ning Zhang Ruijin Liao Yun Feng Wenlong Liao Huanchao Cheng Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect International Journal of Electrical Power & Energy Systems Transformer windings Harmonic current Stress characteristics Multi-physical field simulation |
| title | Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| title_full | Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| title_fullStr | Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| title_full_unstemmed | Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| title_short | Simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| title_sort | simulation study on converter transformer windings stress characteristics under harmonic current and temperature rise effect |
| topic | Transformer windings Harmonic current Stress characteristics Multi-physical field simulation |
| url | http://www.sciencedirect.com/science/article/pii/S0142061525000560 |
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