Junction Temperature Control of a Traction Inverter Based on Three-Level Active Neutral Point-Clamping

Haitao Liu, Sen Wang, Liang Hu, Ling Feng (), Yue Wang and Chaoqun Xiang ()
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Haitao Liu: The School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China
Sen Wang: CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou 412000, China
Liang Hu: CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou 412000, China
Ling Feng: CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou 412000, China
Yue Wang: CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou 412000, China
Chaoqun Xiang: The School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China

Energies, 2025, vol. 18, issue 9, 1-16

Abstract: In this study, we propose an active junction temperature control method specifically tailored for traction inverters based on active neutral point-clamped (ANPC) three-level topology. This approach not only enables real-time junction temperature equalization across switching devices, but also minimizes switching losses while preserving synchronous modulation. The methodology begins with a detailed formulation of the loss quantification model for ANPC inverters, establishing the relationship between predicted losses and switching vectors. Building on this foundation, we develop a loss equalization modulation control strategy featuring closed-loop loss control. The effectiveness and practicality of the proposed control method are rigorously validated using simulations and low-power experimental testing, demonstrating its potential to enhance both the reliability and efficiency of traction inverters.

Keywords: traction inverter; active neutral point-clamped inverter; junction temperature equalization; predictive model (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: 2025
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