Diode Open-Circuit Fault Research on the Parallel-Connected 24-Pulse Rectifier With DC-Side Passive Harmonic Reduction Circuit

In this study, a new 36‐pulse rectifier with a hybrid DC‐reinjection circuit is proposed. It multiplies the AC‐side input voltage steps from 12 to 36 using a hybrid auxiliary circuit for voltage and current modulation. Both the AC and DC side harmonics of the rectifier system are efficiently suppressed when combined with filter capacitors at DC side. Only 2 more diodes and an IGBT are used in the proposed approach for constituting the injection circuit. The cascaded structure of rectifier bridges allows for significant voltage gain, making it appropriate for high power output rectification applications. The proposed 12‐pulse rectifier's phase shifting structure and 36‐pulse rectifier's operational theory are introduced. The injection transformer's turn ratio and the IGBT's conduction angle are both designed to have the lowest possible harmonic distortion of the voltage at AC side. Analyses are done on the rectifier's impedance matching feature and energy loss of IGBT. The operating performance of the rectifier is assessed when the active switch fails. With the help of a 1.8 kW prototype and a HIL system based on Starsim, the theoretical portion is confirmed. The results of the simulation and experiments support the effectiveness of the hybrid voltage harmonic injection method studied.

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“…In formula (32), I av2 is the average value of the current flowing through the one diode of the main circuit.…”

Section: 13mentioning

confidence: 99%

“…Moreover, due to active switches in hybrid harmonic injection methods, the rectifier often faces faults caused by overvoltage and overcurrent impact. Currently, the fault analysis of MPRs mainly focuses on the diode open circuit fault [30][31][32]. Nevertheless, the short circuit fault of the switch also needs to be considered.…”

Section: Introductionmentioning

confidence: 99%

A new series‐connected 36‐pulse rectifier with hybrid DC‐reinjection method for high power output

Wang

Chen

et al. 2023

IET Power Electronics

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“…As the rectifier is composed of diodes, the faults of a diode are divided into two types: short circuit (SC) and OC [11]. Generally, protection devices such as fuses and breaker circuits are installed to avoid obvious damage caused by the SC of a diode [12].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu¹,

Ma²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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

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Open-Circuiting Fault Analysis of Series-Connected 24-Pulse Rectifier With Auxiliary Pulse Multiplication Circuit

Wang,

Liu,

Zhao

et al. 2023

2023 26th International Conference on Electrical Machines and Systems (ICEMS)

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Diode Open-Circuit Fault Research on the Parallel-Connected 24-Pulse Rectifier With DC-Side Passive Harmonic Reduction Circuit

Cited by 10 publications

References 22 publications

A new series‐connected 36‐pulse rectifier with hybrid DC‐reinjection method for high power output

A new series‐connected 36‐pulse rectifier with hybrid DC‐reinjection method for high power output

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

Open-Circuiting Fault Analysis of Series-Connected 24-Pulse Rectifier With Auxiliary Pulse Multiplication Circuit

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