Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft-Switching of Isolated Bidirectional DC–DC Converter

Huang, Jun; Wang, Yue; Li, Zhuoqiang; Liu, Wanjun

doi:10.1109/tie.2016.2543182

Cited by 368 publications

(185 citation statements)

References 19 publications

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“…However, there are two apparent drawbacks associated with SPS control: limited ZVS operation range with non-unity converter gain and high circulating current at partial load. Different modulation techniques are then proposed to either extend the ZVS range or alleviate the circulating current, which include extended phase-shift (EPS) [6,[12][13][14][15][16], dual-phase-shift (DPS) [17][18][19][20][21] and triple-phase-shift (TPS) [22][23][24]. Generally, those advanced control strategies introduce one or two controllable inner phase-shifts, so that the power becomes a function of up to three variables.…”

Section: Introductionmentioning

confidence: 99%

Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control

Sun

2018

Energies

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Abstract:The manipulation of the bidirectional power in a dual-active-bridge converter relies on the adjustment of several phase-shift angles. Improper implementation of those adjustments during the transient process of a step load change may induce transient DC bias current in the transformer and accompanied high peak current, which may result in excess loss and safety issues potentially. The paper proposes a load transient modulation to execute the adjustments of the two phase-shift angles for extended-phase-shift (EPS) control in a predictive manner. An unknown phase-shift is introduced to the gating signals of one bridge arm, and the gating signals of other bridge arms would be modified accordingly to realize the required adjustment of the two phase-shift angles together. With the proper selection of the introduced phase-shift, the power adjustment can be done in less than one high-frequency cycle without resulting in DC bias and overshoot current. Although there are four different operation modes existing in EPS, a universal solution of the unknown phase-shift can be obtained for all possible power transition cases between different modes. Validation of the proposed method is performed by means of both simulation and experimental tests.

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Section: Introductionmentioning

confidence: 99%

Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control

Sun

2018

Energies

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“…The dual phase shift (DPS) modulation also has two degrees of freedom (ϕ, τ P = τ S ) but it is used to reduce high inrush current (19) . The dual pulse-width modulation (DPWM), which is also known as the triangular modulation or the triple phase shift, has three degrees of freedom (ϕ, τ P , τ S ) (20) . It can increase the soft-switching range and reduce the high circulating current at a low power range.…”

Section: Introductionmentioning

confidence: 99%

“…Great improvement in efficiency especially at low power transfer has been reported (20)- (24) . The modulation strategy proposed in (21) has analyzed modulations that can operate with the optimal efficiency, although 'the determination of the three degrees of freedom is unclear.…”

Section: Introductionmentioning

confidence: 99%

“…The primary and secondary windings of the transformer (N P and N S ) determine the primary and secondary square voltages, and the potential difference results in the leakage inductance voltage v L1 . Shifting the fundamental phase ϕ f between the middle of primary and secondary square voltages regulates the power flow (20) . The details are discussed in section III.…”

Section: Introductionmentioning

confidence: 99%

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Combined Pulse-Width Modulation of Dual Active Bridge DC-DC Converter to Increase the Efficiency of Bidirectional Power Transfer

Malek

Takaba

2018

IEEJ Journal IA

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A dual active bridge (DAB) dc-dc converter is suitable for bidirectional high-power transfer. However, it has a limited soft-switching range and a high peak current during low power transfer with traditional phase-shift modulation (PSM) when there is a variation in the input/output voltage. To overcome solve this difficulty, this paper proposes a new modulation strategy, combined pulse-width modulation (CPWM) which combines single pulse-width modulation (SPWM) and dual pulse-width modulation (DPWM), with a unified fundamental phase ϕ f for a wide power transfer range. Unlike previous modulation strategies, CPWM is applicable for bidirectional power transfer. In order to combine SPWM and DPWM, this study comprehensively analyzes the soft-switching range and the peak current of PSM, SPWM, and DPWM. The CPWM strategy is experimentally tested using a 1.6 kW prototype to verify the improvement in efficiency and its bidirectional power transfer capability. The experimental results show efficiencies of both positive and negative power transfers were improved by using CPWM.

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“…As the DAB converter has many advantages, such as galvanic isolation, zero-voltage switching, high power density, high efficiency, and symmetric structure [6], it has been drawn more attention compared with other bidirectional DC-DC converters. Until now, researchers have focused on modeling [7], control strategies [8][9][10], design methodology [11], and modulation strategies [3,12]. However, the complex dynamics in the digitally controlled DAB converter, caused by switching nonlinearity and control delay [13], may deteriorate the working performance and bring stability problem.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of digitally controlled dual active bridge converters

Shi

Liu

et al. 2017

J. Mod. Power Syst. Clean Energy

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The dual active bridge (DAB) converters are widely used in the energy storage equipment and the distributed power systems. However, the existence of switching nonlinearity and control delay can cause serious stability problem to the DAB converters. Thus, this paper, studies the stability of a digitally controlled DAB converter with an output voltage closed loop controller. Firstly, to accurately study the stability in a DAB converter, a discrete-time model established in a whole switching period is obtained. The model considers the output capacitor ESR, the digital control delay, and sample-and-hold process. By using this model, the stabilities of the DAB converter versus the proportional controller parameter and the output capacitor ESR are analyzed and the critical values are predicted accurately. Moreover, the stability boundary of the proportional controller parameter and the output capacitor ESR is also obtained. The result shows that the value of the output capacitor ESR can have a great effect on the stability region of the proportional controller parameter. Finally, the theoretical analyses are verified by the simulation and experimental results.

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Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft-Switching of Isolated Bidirectional DC–DC Converter

Cited by 368 publications

References 19 publications

Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control

Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control

Combined Pulse-Width Modulation of Dual Active Bridge DC-DC Converter to Increase the Efficiency of Bidirectional Power Transfer

Stability analysis of digitally controlled dual active bridge converters

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