Modeling and Optimization of Dual Active Bridge DC-DC Converter with Dead-Time Effect under Triple-Phase-Shift Control

Song, Chaochao; Chen, Alian; Pan, Yiwei; Du, Chunlei; Zhang, Chenghui

doi:10.3390/en12060973

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…This is due to the different leg voltage that is obtained during the dead-time, depending on whether the switching occurs in ZVS or not. In some cases (namely, when the ZVS condition is not achieved), the output current cannot be simply considered a function of phase-shifts, since dead-times also play a relevant role [37,46,47], which should be further investigated. However, it is worth highlighting that the desired condition is ZVS, so this discrepancy can be avoided, by simply ensuring the desired (ZVS) condition is met (which is one of the features of the proposed optimized control).…”

Section: Comments On Experimental Resultsmentioning

confidence: 99%

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

et al. 2022

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In the field of power electronics-based electrical power conversion, the Dual Active Bridge (DAB) topology has become very popular in recent years due to its characteristics (e.g., bidirectional operation and galvanic isolation), which are particularly suitable to applications such as interface to renewable energy sources, battery storage systems and in smart grids. Although this converter type has been extensively investigated, its analysis and control still pose many challenges, due to the multiple control variables that affect the complex behavior of the converter. This paper presents a theoretical model of the single-phase DAB converter. The proposed model is very general, i.e., it can consider any modulation technique and operating condition. In particular, the converter is seen as composed by four legs, each capable of generating voltage on the inductor, and by the two output legs, which can steer the resulting inductor current to the load. Three variables are considered as the control inputs, i.e., the phase-shifts with respect to one leg. This approach results in a very simple yet accurate closed-form algorithm for obtaining the inductor current waveform. Moreover, a novel analytical model is proposed for calculating the average output current, based on the phase-shift values, independently of the output voltage. It is also shown that average output current can be varied cycle-by-cycle, with no further dynamics. In fact, average output current is not affected by the initial value of inductor current or by DC offset (which may arise during transients). The proposed models can be exploited at several stages of development of a DAB: during the design stage, for fast iteration, when selecting its operating points and when designing the control. In fact, based on the analytical results, a novel control loop is proposed, which adopts a “fictitious” (i.e., open-loop) inner current regulation loop, which can be applied to any modulation scheme (e.g., Single Phase-Shift, Triple Phase-Shift, etc.). The main advantage of this control scheme is that the simple dynamics of the output voltage versus the average output current can be decoupled from the complicated relationship between the phase-shifts and the output current. Moreover, a Finite Control Set (FCS) method is proposed, which selects the optimal operating points for each operating condition and control request, ensuring full Zero-Voltage Switching (ZVS) in all cases. The analytical results obtained and control methods proposed are verified through simulations and extensive experimental tests.

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Section: Comments On Experimental Resultsmentioning

confidence: 99%

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

et al. 2022

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“…From the discussion presented, only the proposals implementing the SPS can solve the modulation by solving a single set of equations. On the other hand, proposals that adopt more advanced techniques (EPS, DPS, or TPS) require to use of highly parameter-dependent approaches, like MPC, PI controller, or look-up table (LUT) [21], to determine some of the controlling variables. These techniques are complex to implement.…”

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confidence: 99%

Analytical and Normalized Equations to Implement the Optimized Triple Phase-Shift Modulation Strategy for DAB Converters

Capó-Lliteras

Oggier

Bullich‐Massagué

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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A fully normalized algorithm to implement the optimal triple-phase shift (TPS) modulation strategy of the dual active bridge converter is proposed in this paper. The algorithm evaluates three simple expressions that fit the optimal solutions obtained in recent works, which allows the algorithm to be implemented in real-time and valid for the whole operating range. As a result, the converter operates under zero voltage switching conditions and minimizes conduction losses. In addition, the algorithm considers the minimum current required to guarantee zero voltage switching condition that faces undesired deadband of switching devices effect. The proposal achieves soft transition between any operation region and fast closed-loop response with no stability concern, presenting robustness under leakage inductance deviation. Finally, the algorithm presented in this paper is verified with a 4 kW experimental prototype. Experimental results show that the algorithm proposed can be evaluated with less than 2.8 µs and allows soft transition between any operation region to be achieved. Besides, fast closed-loop changes of 750 µs through all the operating ranges, keeping minimum RMS current under zero voltage switching, are shown.Index Terms-Dual active bridge (DAB), normalizedmodulation, RMS current minimization, triple phase-shift (TPS), zero voltage switching (ZVS). I. INTRODUCTIONT HE dual active bridge (DAB) has an essential role in dc microgrids, which have high efficiency and fast dynamic response [1]. DAB topology presents outstanding characteristics that allow the bidirectional power flow between two dc voltage sources with galvanic isolation. It can operate under soft-switching mode, increasing the power density. The DAB converter offers modularity. It can work in series [2] or parallel as a current source converter [3]. Moreover, the current source behavior also enables step-up and step-down voltage as a function of control variables and load, allowing its use in applications as renewable energy integration where voltages of energy storage systems (ESSs) are widely variables [4].The DAB topology is shown in Fig. 1. It consists of two full bridges interconnected through a high-frequency transformer with no additional resonant passive elements needed.

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A Transition Completion Detection Circuit for Dual Active Bridge Converters

Nguyen

Pham

2022

2022 11th International Conference on Control, Automation and Information Sciences (ICCAIS)

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Modeling and Optimization of Dual Active Bridge DC-DC Converter with Dead-Time Effect under Triple-Phase-Shift Control

Cited by 8 publications

References 25 publications

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

Analytical and Normalized Equations to Implement the Optimized Triple Phase-Shift Modulation Strategy for DAB Converters

A Transition Completion Detection Circuit for Dual Active Bridge Converters

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