Small-Signal Modeling and Analysis of an Isolated Bidirectional Battery Charger

Carvalho, Edivan Laércio; Carati, Emerson Giovani; Costa, Jean Patric da; Stein, Carlos M. O.; Cardoso, Rafael

doi:10.1109/induscon.2018.8627309

Cited by 4 publications

(2 citation statements)

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“…Therefore, modeling and control are complex. On the other hand, by applying the asymmetrical configuration and PWM strategy proposed in this paper, it was possible to obtain a simplified model to the CFDAB converter [25,27,28]. The experimental results showed that even with the use of simple controllers (PI and PID controllers) with fixed gains, it is possible to control the converter adequately.…”

Section: Discussionmentioning

confidence: 99%

“…The internal resistance (RBat) of the lead-acid batteries increases during the discharge. The variation of the internal resistance comparing a fully charged and a depleted battery was about 40%, according to the [27,28]. To investigate the effects of the parametric variation related to Rbat, Figure 11 shows the dominant closed-loop poles and zero for different parameters.…”

Section: Control System Designmentioning

confidence: 99%

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Asymmetrical Pulse-Width Modulation Strategy for Current-Fed Dual Active Bridge Bidirectional Isolated Converter Applied to Energy Storage Systems

et al. 2020

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This paper proposes an asymmetrical pulse-width modulation (PWM) strategy for current-fed dual-active bridge (CFDAB) converters applied to energy storage systems (ESS). The ESS application considers low-voltage and high-capacity batteries, for low-power applications, such as data centers, residential photovoltaic systems (PV), and uninterruptable power supplies (UPS). The proposed modulation permits the use of an isolation transformer with negligible leakage inductance and, therefore, avoids the use of auxiliary circuits such as snubbers, active-clamp, or resonant cells. Hence, the converter implementation is simplified. The modulation also benefits the design of the control system because the converter can be modeled and controlled using simple strategies. A straightforward, large-signal model for the battery charge mode, which is valid over all the operation range of the converter, is obtained. Also, the converter operates with a fixed dc bus voltage on both charge and discharge modes. These characteristics represent a significant advantage when the CFDAB with PWM modulation is compared with phase-shifted or frequency modulations, commonly applied in these converters.

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Section: Discussionmentioning

confidence: 99%

Section: Control System Designmentioning

confidence: 99%