Cooperative Triple-Phase-Shift Control for Isolated DAB DC–DC Converter to Improve Current Characteristics

Wu, Fengjiang; Fan, Feng; Gooi, Hoay Beng

doi:10.1109/tie.2018.2877115

Cited by 71 publications

(34 citation statements)

References 24 publications

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“…To eliminate the dual-DC-side circulating currents of the DAB converter, we have proposed the cooperative triplephase-shift (CTPS) control method [32], [33], which is also used in this paper to control the DAB converter. The operation waveforms of this control are shown in Fig.…”

Section: A Impedance Modeling Of Dab Convertermentioning

confidence: 99%

Impedance Shaping of Isolated Two-Stage AC-DC-DC Converter for Stability Improvement

Fan

Gooi

2019

IEEE Access

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The isolated two-stage ac-dc-dc converter containing an isolated dual-active-bridge (DAB) dc-dc converter and an ac-dc rectifier has been widely used for connecting the dc sources to the ac utility grid. However, the impedance interaction between the DAB converter and the ac-dc rectifier may cause the instability problem. To address this issue, this paper proposes two control methods to reshape the impedances of the isolated two-stage ac-dc-dc converter by building a virtual impedance connected in parallel or series with the input impedance of the DAB converter. The magnitude of the input impedance of the DAB converter is increased to satisfy the Middlebrook criterion without changing its negative resistance characteristics by the proposed control methods. Furthermore, the design requirements for the proposed controllers are also given to ensure the stable operation of the two-stage converter. The comparison of these two proposed methods is also discussed in terms of stabilizing ability, dynamic performance, and cost. The comprehensive experimental results are provided to validate the proposed methods. INDEX TERMS Impedance shaping, modeling, stability criterion, two-stage converter.

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Section: A Impedance Modeling Of Dab Convertermentioning

confidence: 99%

Impedance Shaping of Isolated Two-Stage AC-DC-DC Converter for Stability Improvement

Fan

Gooi

2019

IEEE Access

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“…To achieve high efficiency, the DAB converters must have low circulating energy and a wide soft‐switching range. There has been considerable academic research devoted to improving these performance indicators [11–23].…”

Section: Introductionmentioning

confidence: 99%

“…The use of multiple phase‐shift control with redundant control variables to optimise inductor current, reactive power, and soft‐switching can effectively improve the efficiency of the DAB converter in a wide operating range. Triple‐phase‐shift (TPS) control is used to optimise the efficiency of the DAB converter in [12–14], but TPS control has three control variables and eight switching states in each switching cycle of 12 operating modes, and the solution of efficiency optimisation is complex and difficult. Therefore, TPS control is not suitable for practical engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Research on efficiency optimisation of DAB converters considering current stress and soft‐switching

Zeng

Rao

Lan

et al. 2021

IET Power Electronics

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To solve the problem of low efficiency of the dual active bridge (DAB) converter under the traditional single‐phase‐shift control, a natural soft‐switching current stress optimisation (NSS‐CSO) method is proposed by considering the current stress optimisation and soft‐switching operation under dual‐phase‐shift (DPS) control. This study establishes the current stress and the soft‐switching analytical models of the DPS control global mode. Based on these models, the Karush–Kuhn–Tucker (KKT) condition is used to analyse the influence of the current stress optimisation methods on the efficiency when all switches achieve controlled soft‐switching or some switches achieve natural soft‐switching. It is found that the NSS‐CSO method is more efficient. Furthermore, the optimal phase‐shift ratio combinations and the corresponding current stress extremums of the NSS‐CSO method under various ranges of transmission power and voltage conversion ratio are deduced completely. The results of this study show that the NSS‐CSO method can effectively improve the operation efficiency of the DAB converter over the entire power range when the voltage conversion ratio does not match. Finally, experimental results confirm the accuracy of the theoretical analysis and the effectiveness of the proposed optimisation method.

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“…In [18], a cooperative TPS, as it was named, was presented. This modulation allows zero current switchings (ZCS) during an extended power range and low RMS current, at the expense of more complex calculus.…”

Section: Introductionmentioning

confidence: 99%

Two-Stage Modulation Study for DAB Converter

Guzman

Vázquez

Liserre³

et al. 2021

Electronics

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The dual active bridge (DAB) is a dc/dc converter frequently employed in multiple applications due to its advantages of isolation, power flexibility, and input and output voltage defined by design. Different multi-phase modulations have been reported to increase DAB efficiency and reduce components stress but, certainly, the control and implementation complexity increases with every displacement angle added because of the multiple variable measurements. This paper presents two-stage modulations based on the single phase-shift (SPS), which allows maintaining simplicity while improving the efficiency of the DAB converter depending on the design conditions. The paper also gives a direction for selecting the proper modulation to achieve the best efficiency for each situation. The different two-stage modulations are described, analyzed, and experimentally tested.

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Cooperative Triple-Phase-Shift Control for Isolated DAB DC–DC Converter to Improve Current Characteristics

Cited by 71 publications

References 24 publications

Impedance Shaping of Isolated Two-Stage AC-DC-DC Converter for Stability Improvement

Impedance Shaping of Isolated Two-Stage AC-DC-DC Converter for Stability Improvement

Research on efficiency optimisation of DAB converters considering current stress and soft‐switching

Two-Stage Modulation Study for DAB Converter

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