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

Song, Chaochao; Yang, Yongheng; Sangwongwanich, Ariya; Blaabjerg, Frede

doi:10.1109/ecce-asia49820.2021.9479285

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…There are many fault diagnosis methods that can be utilized for this DAB-based converter [12], [24]- [31]. The common method are using the midpoint voltage of the legs [20], [28], [29] or transformer currents [29]- [31] to detect the open circuit fault localization. Both these methods can be applied for this current fed DAB converter.…”

Section: Discussion On Fault Diagnosismentioning

confidence: 99%

Open-Circuit Fault-Tolerant Method for Three-Phase CF-DAB Converter with Auto-Balancing Control

2023

Preprint

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<p>Fault-tolerant methods have been recognized for improving the reliability of multi-phase bidirectional DC-DC converters. Few fault-tolerant methods for current-fed dual active bridge (CF-DAB) converters have been developed because it becomes more challenging due to the asymmetrical structure between primary and secondary sides. In this paper, the behaviors of the CF-DAB converter are comprehensively analyzed when an open-circuit fault occurs in different fault scenarios. Analysis and proposed fault-tolerant method are aimed to determine the open-circuit cases which can recover full conversion power after the fault occurs. Moreover, this paper also proposed an auto-balancing control method to prevent the converter from being out of control. The proposed balancing control method can be utilized for general multi-phase current-fed converters. A 6-kW prototype is built to verify the proposed method.</p>

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Section: Discussion On Fault Diagnosismentioning

confidence: 99%

Open-Circuit Fault-Tolerant Method for Three-Phase CF-DAB Converter with Auto-Balancing Control

2023

Preprint

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“…A. Universal Operating Constraint for NPC-Based DAB For the 2/3-level DAB converters, the terminal voltage v cd of the NPC bridge can be two-level (v cd ∈ {±V 2 }) [33], threelevel (v cd ∈ {0, ±V 2 }) [8], four-level (v cd ∈ {±0.5V 2 , ±V 2 }) [34], and five-level (v cd ∈ {0, ±0.5V 2 , ±V 2 }) [9], [10] depending on the applied modulation strategies. Regardless of the modulation strategies, the voltage v cd should not be affected by the polarity of the inductor current i L .…”

Section: Operating Constraints For 2/3-level Dabmentioning

confidence: 99%

Analysis and Optimal Modulation for 2/3-Level DAB Converters to Minimize Current Stress With Five-Level Control

Song

Sangwongwanich

Yang

et al. 2023

IEEE Trans. Power Electron.

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Two-three (2/3)-level dual-active-bridge (DAB) DC-DC converter has high potential to become a promising solution for medium-voltage high-power applications. However, its switching characteristics, modeling, and optimal modulation schemes have not been comprehensively explored yet. In order to avoid voltage and current distortions, and ensure reliable operation, this paper analyzes the operating constraints for the neutral-point-clamped (NPC)-based DAB converters. Based on the obtained operating constraints, the transferred power and current stress models under a five-level control scheme, which is considered as one of the most advantageous control strategies for the NPC-based DAB converters, are obtained with an equivalentwave modeling method. Generic control strategies based on analytical solutions have not be fully explored for the multi-level DAB converters due to the increased number of control variables. With the above, this paper proposes a minimum-current-stress control strategy employing analytical solutions in the entire power range, which are obtained by combining the Karush-Kuhn-Tucker (KKT) conditions and numerical-solution analysis. With the proposed modulation scheme, the control variables can be automatically modified online, instead of relying on offline calculation of the numerical control variables. Therefore, the control complexity can be reduced significantly, especially when the operating parameters change in a wide range. Finally, experimental tests verify the effectiveness of the analysis.

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“…This paper is an extension of [28] with the following improved contributions: the analysis of the OCF characteristics under all ranges of the voltage conversion ratio, a comprehensive comparison of the power transfer capability between the BPA and CSB methods, the extension of the OCF analysis to multi-phase-shift control schemes, and the experimental verification of the theoretical analysis. The rest of this paper is organized as follows.…”

Section: Polarity Of DC Components Of Phase and Magnetization Currentsmentioning

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

Cited by 9 publications

References 12 publications

Open-Circuit Fault-Tolerant Method for Three-Phase CF-DAB Converter with Auto-Balancing Control

Open-Circuit Fault-Tolerant Method for Three-Phase CF-DAB Converter with Auto-Balancing Control

Analysis and Optimal Modulation for 2/3-Level DAB Converters to Minimize Current Stress With Five-Level Control

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

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