Modeling and Control of DAB Converter Applied to Batteries Charging

Costa, Pablo Fernando Soardi; Löbler, Pedro; Roggia, Leandro; Schuch, Luciano

doi:10.1109/tec.2021.3082468

Cited by 20 publications

(8 citation statements)

References 30 publications

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“…Classical compensator design requires perturbing and linearizing Equation ( 5) to obtain a linear small-signal model of the DAB converter. For this purpose, the output current linearization (OCL) method can be applied, see [27]. In particular, the phase shift can be rewritten as δ(t) = ϕ + δ(t), where ϕ is the phase shift required to transfer the desired power…”

Section: Modementioning

confidence: 99%

“…can be obtained as in [27], neglecting R C . The controller C d (z) can be obtained by the discretization of Equation ( 9) and meeting design specifications in terms of phase margin and gain crossover frequency of the open-loop transfer function, see Figure 6.…”

Section: Modementioning

confidence: 99%

“…An alternative approach called the output current linearization (OCL) model is based on the power flow equations from the leading to lagging bridge. A comparative analysis between GAM and OCL models has been carried out in [27]. In particular, the GAM model presents a steady-state error in the large-signal model, as previously described, a magnitude error, and phase oscillations at the converter's switching frequency.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the GAM model presents a steady-state error in the large-signal model, as previously described, a magnitude error, and phase oscillations at the converter's switching frequency. For these reasons, the OCL model has been selected for the design of the regulator in [27]. Generally, the controller design is achieved in the continuous-time domain meeting specifications on the open-loop transfer function, as the gain crossover frequency and phase margin.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, the design requirements refer to the settling time and the overshoot of the step response. The discrete-time controller is then achieved using discretization methods [27,28]. This paper presents a discrete DAB model based on the transferred power between both converter bridges, which overcomes the approximations introduced by the OCL model, which may affect the controller tuning process.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Active-Bridge Model and Control for Supporting Fast Synthetic Inertial Action

et al. 2022

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This article proposes a dual-active-bridge control to support the fast synthetic inertial action in DC microgrids. First of all, the selection of the isolated DC/DC converter to link an energy storage system with the DC bus in a microgrid is analyzed and the advantages of the dual-active-bridge converter controlled by a single-phase shift modulation justify its selection. An active front-end can be then adapted to connect the DC bus with an AC grid. Secondly, this paper presents the design of a discrete PI controller for supporting fast synthetic inertial action. In particular, a discrete dual-active-bridge model based on the transferred power between both converter bridges, which overcomes the approximations of the output current linearization model, is proposed. Moreover, the article introduces a novel equation set to directly and dynamically tune discrete PI parameters to fulfill the design frequency specifications based on the inversion formulae method. In this way, during the voltage/power transients on the DC bus, the controller actively responds and recovers those transients within a grid fundamental cycle. Since the developed set of control equations is very simple, it can be easily implemented by a discrete control algorithm, avoiding the use of offline trial and error procedures which may lead to system instability under large load variations. Finally, the proposed control system is evaluated and validated in PLECS simulations and hardware-in-the-loop tests.

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Section: Modementioning

confidence: 99%

Section: Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dual-Active-Bridge Model and Control for Supporting Fast Synthetic Inertial Action

et al. 2022

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Phase shift control of dual active bridge DC‐DC converter based on feedforward compensation and transient optimization strategy

Luo,

Liu,

Yin

et al. 2024

Circuit Theory & Apps

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SummaryIn the context of the dual active bridge (DAB) bidirectional DC‐DC converter using the traditional dual‐phase‐shift (DPS) control method, a transient DC bias occurs during power co‐direction and commutation conversion. This bias negatively impacts the converter's transient performance and can lead to harsh effects, such as hard switching problems, resulting in power loss and excessive current stress. In a closed‐loop control system, poor transient response may destroy the stability of the converter. In this paper, the transient‐optimized‐dual‐phase‐shift (TODPS) control strategy is proposed to eliminate the transient DC bias and to maintain soft switching during transient states. It reduces power loss, eliminates excessive current stress, and allows for smooth transitions between single‐phase‐shift (SPS) and DPS control strategies without introducing DC bias. A closed‐loop control system based on TODPS control is established with feed‐forward compensation to adjust the primary‐side current and modify transmission power. This adjustment enhances the transient performance of the DAB converter. The proposed strategy is versatile and applicable to various power conversion scenarios involving DAB converters. It enables quick switching of the magnitude and direction of the primary‐side current during transient states, resulting in a smooth transient effect without noticeable overshoot or oscillation. The experiment results verify the effectiveness of the proposed transient optimization strategy.

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Analytical investigation of interleaved input/output parallel DAB converter for grid scale battery storage

Nalamati,

Gupta

2024

Journal of Energy Storage

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Modeling and Control of DAB Converter Applied to Batteries Charging

Cited by 20 publications

References 30 publications

Dual-Active-Bridge Model and Control for Supporting Fast Synthetic Inertial Action

Dual-Active-Bridge Model and Control for Supporting Fast Synthetic Inertial Action

Phase shift control of dual active bridge DC‐DC converter based on feedforward compensation and transient optimization strategy

Analytical investigation of interleaved input/output parallel DAB converter for grid scale battery storage

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