A Fault-Tolerant Strategy for Three-Phase Dual Active Bridge Converter

Davoodi, Amirali; Noroozi, Negar; Zolghadri, Mohammad Reza

doi:10.1109/pedstc.2019.8697835

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…marized in Table I. Besides the fault-tolerant with redundant modules [25], which is not suitable for a single DAB converter due to high cost, there are mainly two fault-tolerant methods for various DAB converters, i.e., 1) put aside the faulty bridge arm (the antiparallel diodes are also removed) [18], [26]; 2) block the gate-driving signals for all switches in the faulty bridge arm (the antiparallel diodes can work normally) [16], [22]- [24], [27]. Since the 2/3-level DAB converter is a single-phase converter, the first method cannot be applied due to lack of redundant bridge arms.…”

Section: Introductionmentioning

confidence: 99%

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Open-Circuit Fault Diagnosis and Tolerant Control for 2/3-Level DAB Converters

Song

Sangwongwanich

Yang

et al. 2023

IEEE Trans. Power Electron.

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Two-three (2/3)-level dual-active-bridge (DAB) converter is a promising DC-DC converter for medium and high voltage applications. That is due to its advantages like high power density, galvanic isolation, and capability of withstanding higher voltage ratings compared to the two-level DAB converters.However, the open-circuit fault (OCF) is critical for the 2/3level DAB converters, resulting in various negative effects, e.g., DC bias, overshoot current, and capacitor voltage imbalance. To address these issues, it is necessary to develop fault diagnosis and fault-tolerant control strategies. This paper thus proposes a method to identify the faulty switch based on the dynamic characteristics when the OCF occurs. The midpoint voltages of the neutral-point-clamped (NPC) bridge arms are employed as the fault diagnosis signals, where the faulty switch can be identified accurately based on the mean values and duty cycles of the midpoint voltages. Subsequently, a fault-tolerant control scheme based on a complementary-switch-blocking (CSB) method is proposed. In this scheme, when the OCF occurs on one switch, the gate-driving signal of its complementary switch is blocked, and the OCF negative effects, e.g., DC bias, overshoot current, and unbalanced capacitor voltages, can be alleviated significantly. Furthermore, the power transfer capability of the 2/3-level DAB converters is enhanced with the proposed scheme compared to the traditional bypass-arm (BPA) method. Finally, experimental tests are carried out to verify the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

“…• Compared to the prior-art fault diagnosis methods which can only locate the faulty bridge arm, e.g., [18], the proposed method based on the midpoint voltages can identify the faulty switch with high accuracy, which is the basis for the subsequent fault-tolerant control.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Diagnosis and Tolerant Control for 2/3-Level DAB Converters

Song

Sangwongwanich

Yang

et al. 2023

IEEE Trans. Power Electron.

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“…For fault diagnosis, the methods require simple, fast, and accurate detection. Some fault diagnosis methods have been proposed based on the residual analysis, circuit analysis, and DC components of phase currents for the two-level DAB converters, matrix converters, and three-phase DAB converters, respectively [7]- [9]. However, they can merely determine the faulty bridge arm rather than the accurate switch.…”

Section: Introductionmentioning

confidence: 99%

“…After fault diagnosis has been carried out, the faulttolerant control method should be applied to eliminate the OCF effects and ensure safe operation of the DAB converters. In [9], a fault-tolerant control method was proposed for the three-phase DAB converters. When the faulty bridge arm is located, it will be disabled and the converters will operate in single-phase state.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Analysis and Fault-Tolerant Control for 2/3-Level DAB Converters

Song

Yang

Sangwongwanich

et al. 2021

2021 IEEE 12th Energy Conversion Congress &Amp; Exposition - Asia (ECCE-Asia)

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Open-circuit faults (OCFs) on power switches are crucial issues for the two-three (2/3)-level dual-active-bridge (DAB) DC-DC converters, resulting in various performance degradation such as DC bias, overcurrent and capacitor voltage imbalance. There are two necessary steps for overcoming these problems, i.e., fault diagnosis and fault-tolerant control. In order to identify the faulty switch, the characteristics of the transient waveforms when the OCF occurs on each switch are analyzed in this paper. Based on the analysis, the midpoint voltage of each bridge arm is employed as the diagnosis signals.According to the mean values and duty cycles of the midpoint voltages, the faulty switch can be located accurately. Subsequently, a fault-tolerant control method called "complementary-switch-blocking" (CSB) is proposed through modulation reconfiguration. In the proposed CSB method, when one switch breaks down, the gate-driving signal of its complementary switch is blocked and the OCF effects can be offset. Finally, simulation results demonstrate that the OCF effects can be reduced significantly with the proposed faulttolerant method, and the power transmission capacity can be improved compared with the traditional fault-tolerant method.

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“…Two typical faults are generally analyzed for the power electronics converters, i.e., short-circuit fault (SCF) and open-circuit fault (OCF) [57-59, 63, 64, 66] of Current overshoots and DC bias can be reduced to a safe range. [63,67] Three-phase two-level DAB Remove the faulty arm and operate the three-phase DAB in single-phase mode Current overshoots and DC bias can be almost eliminated. [68] Block the gate pulses of the two switches in the faulty arm.…”

Section: Fault Diagnosis and Tolerant Controlmentioning

confidence: 99%

Efficient and Reliable Control of Multi-Level Dual-Active-Bridge Converters

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A Fault-Tolerant Strategy for Three-Phase Dual Active Bridge Converter

Cited by 17 publications

References 12 publications

Open-Circuit Fault Diagnosis and Tolerant Control for 2/3-Level DAB Converters

Open-Circuit Fault Diagnosis and Tolerant Control for 2/3-Level DAB Converters

Open-Circuit Fault Analysis and Fault-Tolerant Control for 2/3-Level DAB Converters

Efficient and Reliable Control of Multi-Level Dual-Active-Bridge Converters

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