Novel Modulation of Isolated Bidirectional DC–DC Converter for Energy Storage Systems

Dung, Nguyen Anh; Chiu, Huang‐Jen; Lin, Jing‐Yuan; Hsieh, Yao‐Ching; Chen, Huiting; Zeng, Bo-Xiang

doi:10.1109/tpel.2018.2828035

Cited by 22 publications

(11 citation statements)

References 24 publications

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“…Using the cascaded rectifier in the secondary side of the LLC resonant converter has been proposed in some researches [49][50][51]. However, the need for complex coding for the controller and uneven current sharing among switches are the disadvantages of this technique.…”

Section: Llc Resonant Converter Structurementioning

confidence: 99%

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

et al. 2021

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Soft switching for both primary and secondary side devices is available by using LLC converters. This resonant converter is an ideal candidate for today’s high frequency, high efficiency, and high power density applications like adapters, Uninterrupted Power Supplies (UPS), Solid State Transformers (SST), electric vehicle battery chargers, renewable energy systems, servers, and telecom systems. Using Gallium-Nitride (GaN)-based power switches in this converter merits more and more switching frequency, power density, and efficiency. Therefore, the present paper focused on GaN-based LLC resonant converters. The converter structure, operation regions, design steps, and drive system are described precisely. Then its losses are discussed, and the magnets and inductance characteristics are investigated. After that, various interleaved topologies, as a solution to improve power density and decrease current ripples, have been discussed. Also, some challenges and concerns related to GaN-based LLC converters have been reviewed. Commercially available power transistors based on various technologies, i.e., GaN HEMT, Silicon (Si) MOSFET, and Silicon Carbide (SiC) have been compared. Finally, the LLC resonant converter has been simulated by taking advantage of LTspice and GaN HEMT merits, as compared with Si MOSFETs.

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Section: Llc Resonant Converter Structurementioning

confidence: 99%

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

et al. 2021

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“…Moreover, there are two types of BDCs, which are nonisolated and isolated. Nonisolated TBDCs (NTBDCs) [27][28][29][30][31][32][33] configurations are simpler than isolated TBDCs (ITBDC) 22,23,[34][35][36] and can achieve better efficiency. However, galvanic isolation is required in many applications and mandatory by different national and international standards.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications

Kattel

Mayer

Possamai

et al. 2020

Circuit Theory & Apps

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The main objective of this project is to study the analysis and design of an isolated three-phase bidirectional dc-dc converter connected to the dc microgrid system. The proposed topology achieves efficient power conversion with a wide input voltage range, continuous input current, and bidirectional operation. In forward mode operation, the topology acts as a three-phase push-pull converter to reach a step-up voltage conversion ratio (90 to 450 V). In backward mode operation, the converter acts as an interleaved flyback converter to provide a step-down voltage conversion ratio (450 to 90 V). Over and above that, in both operation senses, the dc voltage gain is presented. The main advantages of this topology are high-switching frequency, the three-phase transformer that provides galvanic isolation between the dc voltage link bus to the battery or ultra-capacitor storage, and input/output filters size reduction.Besides, a fewer number of power switches, the frequency of output voltage, and input current ripple are three times higher than the switching frequency.The three active switches are connected to the same reference, which simplifies the gate drive circuit. Ultimately, the theoretical analysis of the proposed topology is carefully confirmed with the experimental results of the 4 kW converter prototype. K E Y W O R D Sbidirectional dc-dc converter, coupled inductor, interleaved flyback, microgrid, push-pull converter, three-phase transformer

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“…An alternative to providing a generation with constant and controllable output power is the incorporation of energy storage systems (ESS) associated with the PV generation, in different application levels. Due to the high costs related to the construction of high-voltage devices, the insertion of batteries with low voltage and high capacity is of great interest, mainly in small-size systems [2,[5][6][7][8]. Besides, the use of reduced-voltage ESS provides more safety for the users, concerning electrical shocks and, therefore, they are indicated for low-power applications, as residential loads and hybrid PV inverters [2].…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Pulse-Width Modulation Strategy for Current-Fed Dual Active Bridge Bidirectional Isolated Converter Applied to Energy Storage Systems

et al. 2020

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This paper proposes an asymmetrical pulse-width modulation (PWM) strategy for current-fed dual-active bridge (CFDAB) converters applied to energy storage systems (ESS). The ESS application considers low-voltage and high-capacity batteries, for low-power applications, such as data centers, residential photovoltaic systems (PV), and uninterruptable power supplies (UPS). The proposed modulation permits the use of an isolation transformer with negligible leakage inductance and, therefore, avoids the use of auxiliary circuits such as snubbers, active-clamp, or resonant cells. Hence, the converter implementation is simplified. The modulation also benefits the design of the control system because the converter can be modeled and controlled using simple strategies. A straightforward, large-signal model for the battery charge mode, which is valid over all the operation range of the converter, is obtained. Also, the converter operates with a fixed dc bus voltage on both charge and discharge modes. These characteristics represent a significant advantage when the CFDAB with PWM modulation is compared with phase-shifted or frequency modulations, commonly applied in these converters.

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Novel Modulation of Isolated Bidirectional DC–DC Converter for Energy Storage Systems

Cited by 22 publications

References 24 publications

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications

Asymmetrical Pulse-Width Modulation Strategy for Current-Fed Dual Active Bridge Bidirectional Isolated Converter Applied to Energy Storage Systems

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