Exact Solution of ZVS Boundaries and AC-Port Currents in Dual Active Bridge Type DC–DC Converters

Shah, Suyash Sushilkumar; Iyer, Vishnu Mahadeva; Bhattacharya, Subhashish

doi:10.1109/tpel.2018.2884294

Cited by 57 publications

(22 citation statements)

References 7 publications

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“…The polarity of the voltage V th,x is assumed to be positive in (25). If the voltage V th,x is negative, then ZVS is always achieved.…”

Section: Closed Form Solutionmentioning

confidence: 99%

“…Different dual phaseshifts modulations [13]- [15] and triple phase-shift modulations [16]- [18] were proposed for DAB to increase the operating efficiency. The soft-switching areas of DAB converters operated with all three degrees of freedom were identified using various approaches [19]- [25]. Firstly, many approaches use steady-state time-domain analysis or small-signal statespace modeling techniques [25], [26].…”

Section: Introductionmentioning

confidence: 99%

“…The soft-switching areas of DAB converters operated with all three degrees of freedom were identified using various approaches [19]- [25]. Firstly, many approaches use steady-state time-domain analysis or small-signal statespace modeling techniques [25], [26]. Using the time domain analysis DAB operation was characterized into twelve operating modes in [27] and later simplified into five operating modes using graphical method in [28].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Zero Voltage Switching Criteria of Triple Active Bridge Converter

Purgat

Bandyopadhyay

Qin

et al. 2021

IEEE Trans. Power Electron.

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Triple active bridge (TAB) as an isolated multi-port converter is a promising integrated energy system for smart grids or electric vehicles. This paper aims to derive and analyse zero voltage switching (ZVS) regions of TAB, in which both switching losses are reduced, and EMI issues are mitigated. In the proposed closed-form solution of ZVS criteria, parameters such as the parasitic capacitance of the switches, the leakage inductance of the transformer, the switching frequency, the port voltage, the phase-shift inside and between the full-bridges are all taken into account. The analysis shows how the five degrees of freedom can be used to maintain ZVS operation in various operating points. The analysis and derived closed-form ZVS criteria are experimentally verified using a laboratory prototype. The derived analytical ZVS criteria are a powerful tool to study and optimise the operation of TAB converters.

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“…The polarity of the voltage V th,x is assumed to be positive in (25). If the voltage V th,x is negative, then ZVS is always achieved.…”

Section: Closed Form Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Zero Voltage Switching Criteria of Triple Active Bridge Converter

Purgat

Bandyopadhyay

Qin

et al. 2021

IEEE Trans. Power Electron.

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“…In fact, from the twelve cases in Fig. 3, it is possible to compute the behavior of the inductor current i L , which gives information on the rms current values linked to conduction losses and on the current values at the switching instants to recognize ZVS conditions [7], [33], [38].…”

Section: B Loss Contributionsmentioning

confidence: 99%

A Low Complexity Algorithm for Efficiency Optimization of Dual Active Bridge Converters

Pistollato

Zanatta

Caldognetto

et al. 2021

IEEE Open J. Power Electron.

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This paper proposes a triple phase shift modulation (TPS) with an optimization technique that aims at maximizing the efficiency of the dual active bridge converter. Such a converter is often used to interface renewable or energy storage systems in smart dc power systems, where loss minimization via TPS is crucial, especially at light-load conditions. In this paper, favorable modulation parameters are found first, aiming at minimum rms currents and zero voltage switching, by considering only some fundamental converter parameters, namely, the input and output voltages, the transformer ratio, and the leakage inductance. Then, on the basis of the closed-form analytical description of the converter behavior over the determined modulation patterns, trajectories in the modulation planes that are capable of improving the total efficiency are identified. It is shown that such trajectories lead to close-to-optimal efficiency operation, which can be exploited to implement fast perturb-and-observe methods requiring just minimal converter parameters knowledge. The results are verified experimentally on a 1.5-kW prototype. It is shown that the proposed approach achieves close-to-optimal efficiency operation under different input voltages, being the error with respect to the measured optimal points obtained by a brute-force approach lower than about 0.2%. Index Terms-Dual active bridge (DAB), light-load operation, maximum efficiency point identification, TPS optimization, zero voltage switching (ZVS).

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“…6. A DAB converter is used to interface a capacitive energy storage system to the DC MG. To understand the DAB converter's operation, modeling, and control aspects, an interested reader is referred to [35]- [37].…”

Section: Proposed Active Voltage Stabilizermentioning

confidence: 99%

An Active Voltage Stabilizer for a DC Microgrid System

Iyer

Gulur²,

Bhattacharya

et al. 2021

IEEE Access

Self Cite

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This paper analyzes the low-frequency stability challenges that exist in a complex DC microgrid (MG) system. The converters that belong to a DC MG are categorized into different groups based on their control approach. The small-signal model of the DC MG is presented, and the conditions for system stability are derived. In some DC MG applications, there is the possibility of installing off-the-shelf converters with little flexibility and access for controller auto-tuning. To tackle this, a hardware-based active voltage stabilizer solution is proposed to stabilize the DC MG. The active stabilizer's functionality, based on an isolated bidirectional DC-DC converter, is elucidated, and a suitable control strategy is proposed. The active stabilizer and its associated control configuration involve only local voltage sensing and are non-intrusive. A dual active bridge (DAB) converter-based active stabilizer is implemented, and hardwarebased steady-state and transient experimental results from a DC MG test-bench are provided to validate the functionality and effectiveness of the proposed active stabilizer.

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Exact Solution of ZVS Boundaries and AC-Port Currents in Dual Active Bridge Type DC–DC Converters

Cited by 57 publications

References 7 publications

Zero Voltage Switching Criteria of Triple Active Bridge Converter

Zero Voltage Switching Criteria of Triple Active Bridge Converter

A Low Complexity Algorithm for Efficiency Optimization of Dual Active Bridge Converters

An Active Voltage Stabilizer for a DC Microgrid System

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