A Variable Current-Limit Control Scheme for a Bi-directional Converter used in Ultracapacitor Applications

Ahmadi, Behzad; Barati, Farhad; Karimi, Charif

doi:10.1080/15325008.2018.1445139

Cited by 2 publications

(2 citation statements)

References 19 publications

(20 reference statements)

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“…The presented scheme aimed to prevent the converter from becoming unstable. The similar work presented by Ahmadi et al [22] for the DAB; we need to make sure that the converter is prevented from becoming unstable condition. In an ideal DAB, the phase-shift angle limit above which the converter becomes unstable is 90 o .…”

Section: Introductionmentioning

confidence: 92%

Stable Operation Limits in Dual Active Bridge for SuperCapacitor Applications

2022

IJE

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This paper presents an idea for limiting the phase-shift angle in Dual Active Bridge (DAB) which ensures the converter's stability. The stability is the main criterion in a converter's operation without which the converter will stop working. In an ideal DAB which comprises of ideal components, the phase-shift angle limit is 90 o . We developed a detailed model in Matlab/Simulink for DAB based on which the limits for the stable operation of converter are derived. In the developed model, attempts are made to employ as accurate as possible models for the components. In this way, the limits are expected to be very close to the practice. The DAB is a bi-directional converter; meaning that the power flow occurs in both forward and reverse directions. We derived the limits separately for forward and reverse modes. It is shown that the limits are the same for both directions confirming the fact that the DAB is symmetrical. We employed the DAB as the SuperCapacitor (SC) energy storage's interface in this paper.

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Section: Introductionmentioning

confidence: 92%

Stable Operation Limits in Dual Active Bridge for SuperCapacitor Applications

2022

IJE

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“…Moreover, the bi-directional boost converter is employed to regulate the intermediate bus voltage, i.e. U , as presented in [24] and [25].…”

Section: Primary Control Analysis and Design And Lvdc Microgrid Simul...mentioning

confidence: 99%

A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

Barati

Ahmadi²,

Keysan

2023

IEEE Access

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This paper proposes a hierarchical control approach for SuperCapacitor (SC) energy storage and microsources in islanded DC microgrids. It takes into account microsources' dynamic and steadystate limitations. The proposed approach relies on an architecture presented for the SC's and microsources' interfaces with the DC bus. In the proposed architecture, DC microsources interface with the DC bus through buck converters. Moreover, the SC interfaces with the DC bus through the bi-directional buck converter. The instantaneous loads currents are measured and employed in the secondary control to calculate the reference currents for buck converters. In the primary control, we run buck converters as current sources. Moreover, the bi-directional buck converter is run to regulate the DC bus voltage. The proposed approach is generic; meaning that it can be employed for any islanded DC microgrid. Without loss of generality, to prove its effectiveness, we utilized it for a Low Voltage DC (LVDC) microgrid in this paper. Analysis, design, simulations, and experimental verifications are presented for the LVDC microgrid. The experimental results confirm that, by employing the proposed approach, the DC bus voltage deviations from its reference voltage is 5% and it restores in less than 1 sec.INDEX TERMS Islanded DC microgrids, hierarchical control, SC energy storage, microsources' dynamic and steady-state limitations.

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A Variable Current-Limit Control Scheme for a Bi-directional Converter used in Ultracapacitor Applications

Cited by 2 publications

References 19 publications

Stable Operation Limits in Dual Active Bridge for SuperCapacitor Applications

Stable Operation Limits in Dual Active Bridge for SuperCapacitor Applications

A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

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