High efficiency design for ISOP converter system with dual active bridge DC-DC converter

Sato, Masaki; Domoto, Kazuhide; Ishizuka, Yoichi; Manabe, Shinya; Hiizu, Okubo; Yamaguchi, Masahiro; Itagaki, Atsushi

doi:10.1109/apec.2016.7468211

Cited by 21 publications

(5 citation statements)

References 9 publications

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Section: System Structure and Converter Topologymentioning

confidence: 99%

“…Figure 1 shows the topology of the DAB converter. Due to the presence of auxiliary inductor L, the DAB converter can achieve soft switching and zero voltage switching (ZVS) during operation, which also enables the efficiency of the DAB converter to reach over 97% in high-power applications [25,26]. In order to solve the problem of ZVS changing with load in DAB converters, LLC resonant converters have attracted widespread attention for their superior comprehensive performance.…”

Section: System Structure and Converter Topologymentioning

confidence: 99%

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An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

Wang

Wei

et al. 2023

Symmetry

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Direct current transformer (DCT) is a key piece of equipment in direct current (DC) microgrids, and the mainstream topologies mainly include LLC resonant converter (LLC) and dual active bridge (DAB). In this paper, a novel bi-directional buck/boost + CLLLC cascade topology is proposed for the input-series-output-parallel cascade converter system of a DC microgrid. To solve the problem that frequency variation causes the converter to deviate from the optimal operating point, resulting in low efficiency, and the inability to achieve a soft switching function. The CLLLC converter operates near the resonant frequency point as a DCT, only providing electrical isolation and voltage matching, while the buck/boost converter controls the output voltage and the voltage and current sharing of each module. Compared to other cascaded converter systems, the cascaded converter proposed in this paper has high efficiency, simplifies the parameter design, and is suitable for wide input and wide output operating conditions. The system adopts a three-loop control strategy, establishes the small-signal modeling of the system, and its stability is verified by theoretical analysis and simulation. The simulation and experimental results verify the correctness of the proposed cascaded converter based on buck/boost + CLLLC and the effectiveness of the control strategy.

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Section: System Structure and Converter Topologymentioning

confidence: 99%

Section: System Structure and Converter Topologymentioning

confidence: 99%

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

Wang

Wei

et al. 2023

Symmetry

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“…Model discretisation, feedback correction and rolling optimisation are essential requirements for the MPC strategy. By discretising (13) and (14) within one switching cycle, we have…”

Section: Mpc Strategy With the Operation Of The Forward Power Flowmentioning

confidence: 99%

“…Thus, it contributes to the diversification of DCT topology. In MVDC and low-voltage dc (LVDC) micro-grid, multiple dual active bridge (DAB) converters with input-series output-parallel (ISOP) connection [11][12][13][14], modular multilevel high-frequency link dc-dc converter [15,16] and neutral point clamped-DAB [17,18] are some familiar configuration schemes of the DCT. Besides, the ISOP DAB-DCT has been obtained much attention and extensive application over these years due to high modularity and scalability.…”

Section: Introductionmentioning

confidence: 99%

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Zhang

et al. 2020

IET Power Electronics

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DC transformer (DCT) which is composed of dual active bridge (DAB) converters, is capable of fulfiling high-ratio voltage conversion between the medium-voltage dc distribution and low-voltage dc distribution. A model predictive control (MPC) strategy was proposed for the DAB-DCT to improve dynamic performance and achieve a proper power distribution, considering the bidirectional power of DCT. The traditional voltage closed-loop control scheme with the single-phase shift (SPS) and the MPC scheme with SPS are compared on a downscale DAB-DCT laboratory prototype, using PowerPC P2020 + FPGA_6SL X45 as the core controller. The excellent dynamic characteristics of DCT with proposed MPC strategy is verified by extensive experimental results.

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“…In [27, 28] various topologies of DAB converter such as input series and output parallel (ISOP) and modular multilevel converter (MMC) have been presented to transfer the large quantity of power. However, in each DAB of ISOP and MMC converter, the inductor current is non‐sinusoidal for entire power range operations.…”

Section: Introductionmentioning

confidence: 99%

Distributed power flow control using cascaded multilevel isolated bidirectional DC–DC converter with multi‐phase shift modulation

Karthikeyan¹,

Gupta²

2019

IET Power Electronics

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This study proposes a cascaded multilevel isolated bidirectional DC-DC converter (CMIBDC) suitable for large capacity energy storage applications. Compared to conventional IBDC, the proposed converter has higher power-handling capacity distributed among multiple cascaded HV and LV bridges. The HV bridges are cascaded through a high-frequency transformer with a common DC bus. On the other hand, the LV bridges are directly cascaded with isolated DC storage batteries. Effectively, the CMIBDC requires only a single DC input to store the energy in multiple battery units. A multi-phase shift (MPS) modulation scheme has been introduced which provide wide range of power flow control. The MPS modulation shapes the highfrequency link AC current with low THD thus reducing high-frequency losses. Detailed operating waveforms of the proposed CMIBDC converter in different modes are presented. The performance of the proposed converter and modulation scheme has been demonstrated through PSCAD/EMTDC simulation and validated experimentally using Spartan 3AN FPGA processorcontrolled CMIBDC.

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High efficiency design for ISOP converter system with dual active bridge DC-DC converter

Cited by 21 publications

References 9 publications

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Distributed power flow control using cascaded multilevel isolated bidirectional DC–DC converter with multi‐phase shift modulation

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