An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids

Shi, Xiaolong; Jiang, Jiuchun; Guo, Xiaolong

doi:10.3390/en6010027

Cited by 39 publications

(24 citation statements)

References 25 publications

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“…Consequently, in the on-board condition, several topologies that replace the line-frequency transformer by a high-frequency isolation transformer are commonly used which make the mobile energy storage system more compact and flexible. Figure 4 is a two-stage topology that consists of a single-phase PWM AC-DC converter and a dual-active-bridge (DAB) high-frequency isolated DC-DC converter [58][59][60][61][62]. This topology improves safety and reduces size of the converter.…”

Section: Figurementioning

confidence: 99%

Topology of a Bidirectional Converter for Energy Interaction between Electric Vehicles and the Grid

2014

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Abstract:In vehicle-to-grid (V2G) systems, electric vehicles interact with the grid as distributed energy storage systems that offer many potential benefits. As an energy interface between a vehicle and the grid, the bidirectional converter plays a crucial role in their interaction. Its reliability, safety, cost, efficiency, weight, size, harmonics, and other factors are of essential importance for V2G realization, especially for on-board operations. Beyond the common existing topologies for bidirectional chargers, this paper introduces a novel high-power-factor bidirectional single-stage full-bridge (BSS-FBC) topology, which offers advantages in power density, size, weight, cost, efficiency, power quality, dynamic characteristic, reliability, and complexity. Its operational principles and control strategies are presented. Harmonic analysis on the basis of double-Fourier integral is performed with detailed comparison of line current harmonic characteristics between the BSS-FBC topology and unipolar/bipolar controlled single-phase pulse width modulation (PWM) converters. A dynamic model of the topology is derived, its dynamic behavior analyzed, and its compensator design method developed. Simulation and experimental results are employed to verify the design and analysis. Design considerations for the key parameters are discussed. A 3.3 kW prototype is developed for this topology and validated in its vehicle applications. The results demonstrate clearly the benefits and advantages of the new topology.

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Section: Figurementioning

confidence: 99%

Topology of a Bidirectional Converter for Energy Interaction between Electric Vehicles and the Grid

2014

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“…Considering its high efficiency and high power density, the phase-shifted full-bridge (PSFB) converter is applied in this paper. The PSFB converter provides ZVS for all primary switches, therefore the switching losses can be reduced significantly, and high efficiency and low Electro-Magnetic Interference (EMI) can also be achieved [1,2]. This converter has been widely employed in high power density applications, however, the converter operates under a wide range of load variations in battery charger applications [3,4].…”

Section: Introductionmentioning

confidence: 99%

High Efficiency Variable-Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model

Zhao

Liu

et al. 2015

Energies

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Abstract:In this paper, a load adaptive control method to improve the efficiency and dynamic performance of the Phase-Shifted Full-Bridge (PSFB) converter which works under a wide range of load conditions is presented. The proposed control method can be used as a battery charger since this application demands a wide range of load conditions. The composition of the PSFB converter's losses and the loss analysis model are both discussed. According to this model, the optimum switching frequency which results in minimum power loss is adopted to improve the efficiency. The relationship between switching frequency and power loss is formulated over a wide load range. Indicated by this kind of relationship, the proposed controller adjusts the switching frequency at different load currents. Moreover, an adaptive gain adjustment controller is applied to replace the traditional controller, with the aim to improve the dynamic performance which is influenced by the changes of the switching frequency and load current. In addition, the experimental results show that the maximum improvement of efficiency is up to 20%. These results confirm the effectiveness of the proposed load adaptive control method.

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“…These characteristics can reduce switching loss and enable high switching frequency operation. Such advantages make the PSFB converter well suited for high efficiency, high power density and high reliability applications [3,4]. The circuit diagram of a PSFB converter is shown in Figure 1 [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Choice Procedure of Magnetic Component Values for Phase Shifted Full Bridge Converters with a Variable Dead-Time Control Method

Zhao

et al. 2015

Energies

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Magnetic components are important parts of the phase shifted full bridge (PSFB) converter. During the dead-time of switches located in the same leg, the converter can achieve zero-voltage-switching (ZVS) by using the energies stored in magnetic components to discharge or charge the output capacitances of switches. Dead-time is usually calculated under a given set of pre-defined load condition which results in that the available energies are insufficient and ZVS capability is lost at light loads. In this paper, the PSFB converter is controlled by variable dead-time method and thus full advantage can be taken of the energies stored in magnetic components. Considering that dead-time has a great effect on ZVS, the relationship between available energies and magnetic component values is formulated by analyzing the equivalent circuits during dead-time intervals. Magnetic component values are chosen based on such relationship. The proposed choice procedure can make the available energies greater than the required energies for ZVS operation over a wide range of load conditions. Moreover, the burst mode control is adopted in order to reduce the standby power loss. Experimental results coincide with the theoretical analysis. The proposed method is a simple and practical solution to extend the ZVS range.

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An Efficiency-Optimized Isolated Bidirectional DC-DC Converter with Extended Power Range for Energy Storage Systems in Microgrids

Cited by 39 publications

References 25 publications

Topology of a Bidirectional Converter for Energy Interaction between Electric Vehicles and the Grid

Topology of a Bidirectional Converter for Energy Interaction between Electric Vehicles and the Grid

High Efficiency Variable-Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model

A Novel Choice Procedure of Magnetic Component Values for Phase Shifted Full Bridge Converters with a Variable Dead-Time Control Method

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