Minimum-Reactive-Power Scheme of Dual-Active-Bridge DC–DC Converter With Three-Level Modulated Phase-Shift Control

Shi, Haochen; Wen, Huiqing; Chen, Jie; Hu, Yihua; Jiang, Lin; Chen, Guipeng

doi:10.1109/tia.2017.2729417

Cited by 112 publications

(42 citation statements)

References 38 publications

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“…Then, substituting (13) (14) into (17), the transmission power under proposed AMS can be described as:…”

Section: The Influence Of Proposed Ams Strategy On Mdct Performamentioning

confidence: 99%

“…Nowadays, with the largescale configuration of the distributed power sources, energy storage and plug-and-play load devices in DC distribution network, the variation of power flow and loads cause the fluctuation of DC voltages [13]. Thus, similar with other DC transformers, the high-frequency-link (HFL) voltages in MDCT are not always match HFL transformer voltage ratio, leading to increased reactive power, large current stress and decreased efficiency in MDCT, hindering the widespread application of MDCT in DC distribution networks [14].…”

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confidence: 99%

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Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

Wang

Fan

et al. 2020

IEEE Access

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The modular multilevel high-frequency DC transformer (MDCT) plays an important role in the bus connection, voltage conversion, power transmission and electrical isolation in the DC distribution networks. During practical operation, the mismatch between high-frequency-link (HFL) voltages and HFL transformer voltage ratio caused by the variation of DC bus voltages occurs, resulting in the increased reactive power, larger current stress and decreased efficiency in MDCT. To solve this problem, an adaptive modulation strategy (AMS) is proposed in this paper. The proposed AMS adjusts HFL voltages by varying the number of inserted sub-modules adaptively, ensuring the HFL voltages match HFL transformer voltage ratio. Compared with the conventional phase-shift strategies, the proposed strategy obtains higher transmission power capacity and HFL power factor, and it maintains the ideal efficiency of MDCT under light load situation. Besides, the proposed strategy avoids the optimal phase-shift angle calculation containing numerous parameters, reducing computing burden and improving practicality for MDCT. Moreover, the hybrid-wave modulation in proposed strategy makes HFL voltages compose of quasi-square-wave and square-wave, addressing the dv/dt stress problem and ensuring the higher DC voltage utilization and power transmission capability simultaneously. The mathematical model, operation principle and control architecture of proposed AMS are investigated, and the experimental results in a MDCT prototype verify the correctness and effectiveness of the analysis and proposed strategy.

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“…Then, substituting (13) (14) into (17), the transmission power under proposed AMS can be described as:…”

Section: The Influence Of Proposed Ams Strategy On Mdct Performamentioning

confidence: 99%

mentioning

confidence: 99%

Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

Wang

Fan

et al. 2020

IEEE Access

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“…A large body of literature exists that tries to answer the following question: For a given active power, how to set these three degrees of freedom so that rms of the winding currents or the conduction loss in the bridges and transformer can be minimized while satisfying the soft-switching conditions [13]- [14][15] [16]. Some authors aimed at the minimization of the reactive component of power, which is closely related to the conduction loss [17]- [18] [19].…”

Section: Section I Introductionmentioning

confidence: 99%

A Bidirectional Soft-Switched DAB-Based Single-Stage Three-Phase AC–DC Converter for V2G Application

Das

Weise

Basu

et al. 2019

IEEE Trans. Transp. Electrific.

164

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In vehicle-to-grid applications, the battery charger of the electric vehicle (EV) needs to have a bidirectional power flow capability. Galvanic isolation is necessary for safety. An ac-dc bidirectional power converter with high-frequency isolation results in high power density, a key requirement for an on-board charger of an EV. Dual-active-bridge (DAB) converters are preferred in medium power and high voltage isolated dc-dc converters due to high power density and better efficiency. This paper presents a DAB-based three-phase ac-dc isolated converter with a novel modulation strategy that results in: 1) single-stage power conversion with no electrolytic capacitor, improving the reliability and power density; 2) open-loop power factor correction; 3) soft-switching of all semiconductor devices; and 4) a simple linear relationship between the control variable and the transferred active power. This paper presents a detailed analysis of the proposed operation, along with simulation results and experimental verification.

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“…Among the bidirectional DC-DC converters, dual-active-bridge (DAB) topology is one of the best options for renewable energy applications because of its benefits such as insulation, high reliability, ease of realising soft-switching control, simple topology and bidirectional energy flow [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In general, the most common control methods for such a topology are the conventional single phase-shift (SPS) control and dual phase-shift (DPS) control [4][5][6][7][8][9][10]. According to the SPS control scheme, the gate signals are phase shifted in the corresponding switches of the primary and the secondary sides.…”

Section: Introductionmentioning

confidence: 99%

“…This control method features the simplicity. However, it suffers from limited flexibility since one phase-shift variable cannot take other considerations such as circulation loss, current stress, soft switch and reverse power flow [4][5][6][7][8][9][10][11][12][13]. The DPS control scheme includes the first phase shift between the primary side and secondary side as well as the second phase shift between the two bridge legs of the primary side to reduce the converter circulating current.…”

Section: Introductionmentioning

confidence: 99%

Efficiency optimisation of ZVS isolated bidirectional DAB converters

Dung

Chiu

Lin

et al. 2018

IET Power Electronics

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This study presents a control method for isolated bidirectional dual-active-bridge converters to optimise the efficiency by achieving the zero-voltage switching (ZVS) in high-voltage applications, which the switching losses are the major issues. At light-load condition, the duty control algorithm is proposed to achieve the ZVS for all switches while the triple phase shift with ZVS condition is realised at heavy load condition. The operating principles and the design considerations of the proposed control scheme are analysed in detail. A 2 kW prototype converter is built up and tested to verify the feasibility of the proposed control strategy.

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Minimum-Reactive-Power Scheme of Dual-Active-Bridge DC–DC Converter With Three-Level Modulated Phase-Shift Control

Cited by 112 publications

References 38 publications

Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

Adaptive Modulation Strategy for Modular Multilevel High-Frequency DC Transformer in DC Distribution Networks

A Bidirectional Soft-Switched DAB-Based Single-Stage Three-Phase AC–DC Converter for V2G Application

Efficiency optimisation of ZVS isolated bidirectional DAB converters

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