Hybrid Duty Modulation for Dual Active Bridge Converter to Minimize RMS Current and Extend Soft-Switching Range Using the Frequency Domain Analysis

Mou, Di; Luo, Quanming; Li, Jia; Wei, Yuqi; Wang, Zhiqing; Sun, Pengju; Du, Xiaoze; Mantooth, H. Alan

doi:10.1109/tpel.2020.3022416

Cited by 30 publications

(7 citation statements)

References 27 publications

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“…Thus, those optimal solutions should be calculated offline and pre-stored in a look-up table in microcontrollers. To reduce the control complexity, some currentrelated optimal control strategies, where the RMS current and peak current were applied as the optimization objectives, have been proposed since the current-related models are simpler than the power loss or efficiency models [19], [24]- [31], as shown in Table I. It can be seen from Table I that analytical solutions were generally applied to two-level DAB converter while numerical solutions were applied to the multi-level DAB converters.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…21 Deriving DAB-based ac-ac converters for SST applications is concerned with several practical issues, which include component count, power density, and efficiency. In this context, many works reported in the literature are dedicated to optimize the design of HFTs, 22 extend the soft-switching range, 23 and control the power flow through the HFT. 24 Overall, it is reasonable to state that potential candidates for SST applications should be capable of providing high-frequency isolation, input PFC, bidirectional power flow, and reactive power compensation, while also keeping the load unaffected by disturbances that may occur in the power grid.…”

Section: Introductionmentioning

confidence: 99%

Family of single‐phase high‐frequency isolated AC–AC converters

Filho

Tofoli

Barreto

et al. 2022

Circuit Theory & Apps

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This work presents a family of single‐phase ac–ac converters with high‐frequency isolation based on the association of interleaved transformers and the dual active bridge (DAB) converter. From distinct configurations of the dc link in terms of half‐bridge (HB), full‐bridge (FB), and interleaved full‐bridge (IFB) arrangements, one can obtain three symmetrical and six asymmetrical structures, with distinct trade‐offs among the number of active switches, total dc‐link voltage, and effective operating frequency of the filter elements. Prominent advantages of the derived circuits include input power factor correction (PFC), a nearly sinusoidal load voltage, the operation of active switches under soft‐switching condition during part of the line period, reduced current stresses, good current sharing due to the interleaved transformers, as well as multilevel voltage waveforms on both sides of the high‐frequency transformer (HFT). Experimental results obtained from an experimental prototype of an ac–ac FB‐IFB converter are presented to validate the theoretical assumptions.

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“…Similarly, a hybrid control including the primary asymmetric PWM control plus the secondary PS control is proposed for a hybrid-bridge based semidual-activebridge (S-DAB) converter to improve the efficiency at light load in [17]. For the full-bridge based DAB converter, [18] and [19] propose an efficiency-oriented hybrid duty modulation scheme and an optimal asymmetric duty modulation, respectively. Multi-degree-of-freedom controls can be obtained because of the increasing amount of power devices with asymmetric duty.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid-Bridge-Based Dual Active Bridge Converter With Reduced Device Count

Liu²,

Wang

et al. 2022

IEEE Open J. Power Electron.

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In this paper, a hybrid-bridge-based dual-active-bridge (DAB) converter with a three-level (TL) half-bridge and a two-level full-bridge is proposed, which can be utilized to interface the medium voltage and low voltage DC. In the proposed converter, there are only eight power switches in total. Compared with the traditional hybrid-bridge-based DAB converter with a neutral-point-clamped (NPC) type TL half-bridge, a fewer power device count and higher efficiency can be realized in the proposed converter due to removing clamping diodes. Thus, a more compact circuit structure and a lower cost can be obtained. Moreover, zero-voltage-switching (ZVS) of all switches in primary-side and secondary-side can be achieved in the proposed converter. The operating principle, performances, and characteristics of the proposed converter are analyzed in detail. Also, a specification design case with a detailed key parameter design is given. Finally, a 1-kW experimental prototype is established to validate the proposed converter, and obtained experimental results are highly consistent with the theoretical analysis.Index Terms-Dual-active-bridge (DAB) converter, hybrid-bridge, compact structure, zero-voltage-switching (ZVS).

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Hybrid Duty Modulation for Dual Active Bridge Converter to Minimize RMS Current and Extend Soft-Switching Range Using the Frequency Domain Analysis

Cited by 30 publications

References 27 publications

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

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

Family of single‐phase high‐frequency isolated AC–AC converters

A Hybrid-Bridge-Based Dual Active Bridge Converter With Reduced Device Count

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