Open-Switch Fault Diagnosis for Grid-Tied HANPC Converters Using Generalized Voltage Residuals Model and Current Polarity in Flexible Distribution Networks

Xing Peng, Fan Xiao (), Ming Li, Yizhe Chen, Yifan Gao, Ruifeng Zhao and Jiangang Lu
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Xing Peng: National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha 410082, China
Fan Xiao: National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha 410082, China
Ming Li: China Southern Power Grid Research Institute, Guangzhou 510663, China
Yizhe Chen: Zhaoqing Power Supply Bureau of Guangdong Power Grid Co., Ltd., Zhaoqing 526060, China
Yifan Gao: Zhaoqing Power Supply Bureau of Guangdong Power Grid Co., Ltd., Zhaoqing 526060, China
Ruifeng Zhao: Power Dispatching Control Center of Guangdong Power Grid Corporation, Guangzhou 510600, China
Jiangang Lu: Power Dispatching Control Center of Guangdong Power Grid Corporation, Guangzhou 510600, China

Energies, 2025, vol. 18, issue 14, 1-23

Abstract: The diagnosis of open-circuit (OC) faults in power switches is the premise for implementing fault-tolerant control, a critical aspect in ensuring the reliable operation of three-level hybrid active neutral-point-clamped (HANPC) converters in flexible distribution networks. However, existing fault diagnosis methods do not clearly reveal the relationship between the switching-state sequence state and the modulation voltage before and after the fault, which limits their applicability in grid-tied HANPC converters. In this article, a generalized voltage residuals model, taken as the primary diagnostic variable, is proposed for switch OC fault diagnosis in HANPC converters, and the physical meaning is established by introducing the metric of “the variation of the pulse equivalent area”. To distinguish between faulty switches with similar fault characteristics, the neutral current path is reconfigured with a set of rearranged gate sequences. Meanwhile, the auxiliary diagnostic variable, named the current polarity state variable, is developed by means of a sliding window counting algorithm. Additionally, as a case study, a diagnostic criterion for the single-switch fault of HANPC converters is designed by using proposed diagnostic variables. Experimental results are presented to verify the effectiveness of the proposed fault diagnosis method, which achieves accurate faulty switch identification in all tested scenarios within 25 ms.

Keywords: hybrid active neutral-point-clamped converter; open-circuit fault; generalized voltage residuals; current polarity state; diagnostic criterion (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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