Power Flow Control for Decoupled Load Performance of Current-Fed Triple Active Bridge Converter

Smith, Zachary T.; Beddingfield, Richard; Grainger, Brandon M.

doi:10.1109/ojpel.2023.3266658

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…In some recent studies [19][20][21], researchers used particle swarm optimization and a genetic algorithm to calculate the phase shift angle of DAB to optimize the RMS value of the inductor current and the current Single-phase shift control (SPS) is the most basic control strategy of a TAB-DCER. Using an SPS control strategy, the authors of [6,7] analyzed expressions of port power in different operating modes and used model predictive control to achieve port power decoupling. The authors of [8,9] eliminated the AC component of the current and carried out a real-time calculation of the decoupling phase shift angle to reduce the power coupling between ports.…”

Section: Introductionmentioning

confidence: 99%

“…However, this method is suitable only for TAB-DCER converters with specific resonant structures. In some related studies [6][7][8][9][10][11], the efficiency of the TAB-DCER was not assessed. The authors of [12,13] analyzed the ZVS condition of a TAB-DCER in detail, but these analyses were only based on SPS control, which is characterized by limited control degrees of freedom and low flexibility.…”

Section: Introductionmentioning

confidence: 99%

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An Efficiency Improvement Strategy for Triple-Active-Bridge-Based DC Energy Routers in DC Microgrids

Meng,

Duan,

Sha

et al. 2024

Electronics

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A triple-active bridge (TAB) can be used as a power conversion unit in a three-port DC energy router (DCER) such as a triple-active bridge-based DC energy router (TAB-DCER). The operational loss of a TAB can be seen as a key factor affecting the efficiency of a TAB-DCER. However, the RMS value of the inductor current of the TAB-DCER increases under single-phase shift (SPS) control, and this greatly increases the system operating losses. The use of phase-shifted plus PWM (PS-PWM) control can reduce the RMS value of the inductor current, but its mathematical model is complex, and involves difficult calculations. To address this problem, in the study reported here, we developed an optimal control strategy for the RMS value of the inductor current based on TAB-DCER. First, the working principle of a TAB-DCER under PS-PWM control was analyzed, and a circuit decomposition model was established. Second, the operating modes under PS-PWM control were analyzed, and corresponding expressions of port power and the RMS value of the inductor current were obtained. Third, an optimized mathematical model of the sum of squares of the RMS value of the inductor current of the TAB-DCER was constructed. Finally, a genetic algorithm was used to solve the mathematical model and derive the optimal phase shift angle; this resulted in a lower RMS value of the inductor current in the TAB-DCER and reduced the system operating losses. The simulation and experimental results show that the TAB-DCER used in the present study can reduce operating losses, improve system efficiency, and deliver coordinated power control.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Efficiency Improvement Strategy for Triple-Active-Bridge-Based DC Energy Routers in DC Microgrids

Meng,

Duan,

Sha

et al. 2024

Electronics

View full text Add to dashboard Cite

show abstract

“…[1][2][3]. However, this type of converter has two intrinsic problems, namely, the soft-start issue during the start-up process and the voltage spike issue in normal working conditions [4][5][6][7][8]. A large number of studies have focused on overcoming these problems, but two different circuits should be required to overcome them.…”

Section: Introductionmentioning

confidence: 99%

A Hardware-Simplified Soft-Start Scheme for Current-Fed Full-Bridge DC-DC Converter

Li,

Meng

et al. 2023

Electronics

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At present, the current-fed full-bridge DC-DC converter still faces two inherent defects, namely, the soft-start issue during the start-up process and the voltage spike issue in normal working conditions. In existing research, a large number of attempts have been reported to overcome these two inherent issues. However, the existing solutions are all based on both redundant soft-start circuits and snubber circuits, and two different circuits are required. As a result, the cost of the current-fed full-bridge DC-DC converter is high, especially because the soft-start circuits are only used during the start-up process. So, to reduce device redundancy, a hardware-simplified soft-start scheme is proposed in this paper. In the proposed scheme, the snubber circuit is reused for the soft-start process based on topology reconfiguration, avoiding additional soft-start circuits to reduce the cost of this DC-DC converter. In this proposed method, the current-fed full-bridge DC-DC converter is operated as the voltage-fed full-bridge DC-DC converter by always turning on the snubber switch during the start-up process. Then, the output capacitor can be charged by slowly increasing the output voltage of the H bridge. Then, when the output voltage is high enough, the current-fed full-bridge DC-DC converter is again operated in the current-fed mode to boost the voltage. Subsequently, the converter characters and control strategy were examined and analyzed. The experimental results verify the feasibility of the proposed hardware-simplified soft-start scheme for the current-fed full-bridge DC-DC converter.

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“…Other researchers have aimed to solve the nonlinear control-to-output equations (online or offline), to implement effective decoupling over a wider range [35,52,96,97]. However, similar to MPC-based approaches, the computational cost of online calculation using iterative methods (e.g., Newton method) can be high, and having simplified iterative methods or lower iteration numbers can affect the accuracy and performance.…”

Section: Introductionmentioning

confidence: 99%

A Survey on Multi-Active Bridge DC-DC Converters: Power Flow Decoupling Techniques, Applications, and Challenges

et al. 2023

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Multi-port DC-DC converters are a promising solution for a wide range of applications involving multiple DC sources, storage elements, and loads. Multi-active bridge (MAB) converters have attracted the interest of researchers over the past two decades due to their potential advantages such as high power density, high transfer ratio, and galvanic isolation, for example, compared to other solutions. However, the coupled power flow nature of MAB converters makes their control implementation difficult, and due to the multi-input, multi-output (MIMO) structure of their control systems, a decoupling control strategy must be designed. Various control and topology-level strategies are proposed to mitigate the coupling effect. This paper discusses the operating principles, applications, methods for analyzing power flow, advanced modulation techniques, and small signal modelling of the MAB converter. Having explained the origin of cross-coupling, the existing power flow decoupling methods are reviewed, categorized, and compared in terms of effectiveness and implementation complexity.

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Power Flow Control for Decoupled Load Performance of Current-Fed Triple Active Bridge Converter

Cited by 4 publications

References 27 publications

An Efficiency Improvement Strategy for Triple-Active-Bridge-Based DC Energy Routers in DC Microgrids

An Efficiency Improvement Strategy for Triple-Active-Bridge-Based DC Energy Routers in DC Microgrids

A Hardware-Simplified Soft-Start Scheme for Current-Fed Full-Bridge DC-DC Converter

A Survey on Multi-Active Bridge DC-DC Converters: Power Flow Decoupling Techniques, Applications, and Challenges

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