Current-Stress-Optimized Switching Strategy of Isolated Bidirectional DC–DC Converter With Dual-Phase-Shift Control

Zhao, Biao; Song, Qiang; Liu, Wenhua; Sun, Wei

doi:10.1109/tie.2012.2210374

Cited by 271 publications

(99 citation statements)

References 25 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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“…Since the switching frequency is usually from several kHz to hundreds of kHz, the overall size can be reduced and the power density can be increased [4]. In terms of dynamic control for DAB converters, there are two modes of control that are usually employed: voltage mode and current mode [5][6][7][8][9][10][11][12]. Assume that power transmission is from the medium voltage DC (MVDC) side to the low voltage DC (LVDC) side.…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of Dual-Active-Bridge Converter with Reduced-Order Proportional-Integral Observer

et al. 2018

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When controlling a Dual-Active-Bridge (DAB) DC/DC converter, the high frequency terminal current is usually measured for use in the current feedback controller. In order to measure that current, a wide bandwidth sensor accompanied with high-speed amplifiers are required. Furthermore, a high Analog-to-Digital sampling rate is also necessary for sampling and processing the measured data. To avoid those expensive requirements, this paper proposes an alternative control method for the DAB converter. In the proposed method, the terminal current is estimated by a reduced-order proportional integral observer. A technique is also proposed to reduce the phase drift effect when the voltages at two terminals are not matched. Afterwards, a combined current feedforward-voltage feedback control system is developed to enhance the system dynamics and to regulate the output voltage. This control system needs only the information of the terminal voltages and no current sensor is required. Experimental results show that the observer can estimate the terminal current very quickly with the accuracy of more than 98%. In addition, the output voltage is well regulated with a fluctuation of less than ±2.6% and a settling time of less than 6.5 ms in the presence of a 30% load change.

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“…In [7,8], the extended-phase-shift (EPS) control and the dual-phase-shift control are proposed to reduce the current stress for DAB. Two degrees of freedom are utilized for optimization in EPS and DPS control.…”

Section: Introductionmentioning

confidence: 99%

“…However, the non-active current caused by zero power transmission is not considered in [23,24]. Similar to the optimized methods in [7][8][9][10][11][12], these optimized control methods in [21][22][23][24] are essentially still for current. In fact, the backflow power is just a portion of the non-active power transmission in DAB and the limitations of the backflow power control method are not presented.…”

Section: Introductionmentioning

confidence: 99%

Backflow Power Optimization Control for Dual Active Bridge DC-DC Converters

Xiong

Hao

et al. 2017

Energies

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This paper proposes optimized control methods for global minimum backflow power based on a triple-phase-shift (TPS) control strategy. Three global optimized methods are derived to minimize the backflow power on the primary side, on the secondary side and on both sides, respectively. Backflow power transmission is just a portion of non-active power transmission in a dual active bridge (DAB) converter. Non-active power transmission time is proposed in this paper, which unifies zero power transmission and backflow power transmission. Based on the proposed index, an optimized control method is derived to achieve both the maximum effective power transmission time and minimum current stress of DAB at the same time. A comparative analysis is performed to show the limitations of the minimum backflow power optimization method. Finally, a prototype is built to verify the effectiveness of our theoretical analysis and the proposed control methods by experimental results.

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Current-Stress-Optimized Switching Strategy of Isolated Bidirectional DC–DC Converter With Dual-Phase-Shift Control

Cited by 271 publications

References 25 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

Sensorless Control of Dual-Active-Bridge Converter with Reduced-Order Proportional-Integral Observer

Backflow Power Optimization Control for Dual Active Bridge DC-DC Converters

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