Multiple-Fault-Tolerant Dual Active Bridge Converter for DC Distribution System

Shi, Haochen; Wen, Huiqing; Chen, Guipeng; Bu, Qinglei; Chu, Guanying; Zhu, Yinxiao

doi:10.1109/tpel.2021.3106508

Cited by 30 publications

(18 citation statements)

References 36 publications

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“…Regardless of variation of R L , I o can be maintained constant as long as V i , f s , φ are fixed. Meanwhile the output voltage naturally rises from V omin to V omax with the increasing equivalent load resistance R L according to (3). In other words, the DBRC is able to act as a current source.…”

Section: Methods I With Constant Frequency Varying Phase-shift Modulationmentioning

confidence: 99%

“…Many researches about battery charging systems have been reported in the literature. The achievements to improve charging efficiency are attributed to novel topologies, optimal design and control strategies [1][2][3][4]. Non-isolated battery charging topologies are able to achieve high performance like the Cockcraft-Walton multiplier and switched inductorscapacitors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Constant-Current, Constant-Voltage Operation of a Dual-Bridge Resonant Converter: Modulation, Design and Experimental Results

Zhou

et al. 2021

Applied Sciences

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To meet the requirements of charging the mainstream rechargeable batteries, in this work, a dual-bridge resonant converter (DBRC) is operated as a battery charger. Thanks to the features of this topology, the required high efficiency can be achieved with a wide range of battery voltage and current by using different modulation variables. Firstly, a typical charging process including constant-voltage stage and constant-current stage is indicated. Then, two different modulation methods of the DBRC are proposed, both of which can realize constant-voltage charging and constant-current charging. Method I adopts phase-shift modulation with constant switching frequency while Method II adopts varying frequency modulation. Furthermore, as guidance for practical application, the design principles and detailed design procedures of the DBRC are customized for the two modulation methods respectively in order to reduce the switching loss and conduction loss. Consequently, the full soft-switching operation with low rms tank current is achieved under the two modulation methods, which contributes to the high efficiency of the whole charging process. At last extensive simulation and experimental tests on a lab prototype converter are performed, which prove the feasibility and effectiveness of the proposed modulation strategies.

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Section: Methods I With Constant Frequency Varying Phase-shift Modulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constant-Current, Constant-Voltage Operation of a Dual-Bridge Resonant Converter: Modulation, Design and Experimental Results

Zhou

et al. 2021

Applied Sciences

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“…For instance, when the OCF occurs on S 21 , S 22 , S 27 , and S 28 , the polarity of the inductor current is the same. In [21]- [24], fault diagnosis methods based on the average midpoint voltages of the bridge arms were proposed. However, these methods are applicable only for the two-level DAB converters.…”

Section: Introductionmentioning

confidence: 99%

“…3. Experimental waveforms when the traditional fault diagnosis method in [21]- [24] is applied to the 2/3-level DAB converter (vcg is the midpoint voltage of the first NPC-bridge arm).…”

Section: Introductionmentioning

confidence: 99%

“…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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