Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system

Bangyou ZHU; Shaoxiang MA; Hongqi ZHANG; Zhiheng LI; Ming ZHANG; Yuan PAN

doi:10.1088/2058-6272/ac9aa9

Plasma Science and Technology > 2022 > 24(12): 124004. > DOI: 10.1088/2058-6272/ac9aa9

Bangyou ZHU, Shaoxiang MA, Hongqi ZHANG, Zhiheng LI, Ming ZHANG, Yuan PAN. Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system[J]. Plasma Science and Technology, 2022, 24(12): 124004. DOI: 10.1088/2058-6272/ac9aa9

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Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system

International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China

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Corresponding author:
Shaoxiang MA, E-mail: mashaoxiang@hust.edu.cn
Received Date: August 02, 2022
Revised Date: October 14, 2022
Accepted Date: October 15, 2022
Available Online: December 05, 2023
Published Date: November 29, 2022

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Abstract

Abstract

The acceleration grid power supply (AGPS) is a crucial part of the Negative-ion Neutral Beam Injection system in the China Fusion Engineering Test Reactor, which includes a 3-phase passive (diode) rectifier. To diagnose and localize faults in the rectifier, this paper proposes a frequency-domain analysis-based fault diagnosis algorithm for the rectifier in AGPS. First, time-domain expressions and spectral characteristics of the output voltage of the TPTL-NPC inverter-based power supply are analyzed. Then, frequency-domain analysis-based fault diagnosis and frequency-domain analysis-based sub-fault diagnosis algorithms are proposed to diagnose open circuit (OC) faults of diode(s), which benefit from the analysis of harmonics magnitude and phase-angle of the output voltage. Only a fundamental period is needed to diagnose and localize exact faults, and a strong Variable-duration Fault Detection Method is proposed to identify acceptable ripple from OC faults. Detailed simulations and experimental results demonstrate the effectiveness, quickness, and robustness of the proposed algorithms, and the diagnosis algorithms proposed in this article provide a significant method for the fault diagnosis of other rectifiers and converters.
- fault diagnosis,
- 3-phase passive rectifier,
- acceleration grid power supply (AGPS),
- fault localization

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Acknowledgments

The authors would like to thank the HVPS group as well as the other members of the J-TEXT team for their assistance with module testing. This work was supported by the National Key R & D Program of China (No. 2017YFE0300104) and National Natural Science Foundation of China (No. 51821005).

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