Direct AC charging of EV Reconfigurable Cascaded Multilevel Converter

Tresca, Giulia; Formentini, Andrea; Granata, Samuele; Leuzzi, Riccardo; Zanchetta, Pericle

doi:10.1109/ecce50734.2022.9947306

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…Nevertheless, there is still a paucity of studies addressing the charging process involving the direct connection of MLCs three-output terminals to a three-phase grid, be it isolated or non-isolated. This paper presents a charging architecture suitable for all three-output terminal multilevel converters and strategically proved on the RCMC as an extension of the work [22]. The battery arrangement adopts Reconfigurable Battery Modules (RBMs), wherein three battery cells are connected in series via seven strategically positioned switches.…”

Section: Introductionmentioning

confidence: 99%

AC Direct Charging for Electric Vehicles via a Reconfigurable Cascaded Multilevel Converter

Tresca,

Zanchetta

2024

Energies

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This paper presents a charging architecture for the Reconfigurable Cascaded Multilevel converter, which was specifically designed for electric vehicle (EV) powertrain applications. The RCMC topology is capable of executing power conversion and actively managing battery systems concurrently. The active battery management is achieved using the Reconfigurable Battery Module, which regulates the serial connection of cells via a switch pattern. In this paper, the RCMC is directly interfaced with an AC three-phase power system, facilitating the dynamic control over battery cells charging. Its inherent design allows for the implementation of various charging algorithms, customizable to specific requirements, without necessitating additional intermediary power stages. Firstly, an overview of the RCMC topology is given, and an analysis to define the optimal filter inductance is carried out. Subsequently, after the AC system characteristics are explained, two charging algorithms are presented and described: one prioritizes State of Charge (SOC) balancing among battery cells, while the other focuses on minimizing power losses. Moreover, a time estimation computation for the RCMC is carried out considering a two-level AC charging station. The result is compared with the time required for a conventional battery pack. The results show a reduction of 10 s in charging time for a mere 20% increase in SOC. Finally, the experimental setup is presented and used to validate the efficacy of the proposed algorithms.

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Section: Introductionmentioning

confidence: 99%

AC Direct Charging for Electric Vehicles via a Reconfigurable Cascaded Multilevel Converter

Tresca,

Zanchetta

2024

Energies

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“…Primarily, researchers propose a direct connection between the grid and the multilevel converter phases [9][10][11][12][13][14]. This involves coupling the converters and grid phases to charge the battery modules using customized modulations, such as utilizing the state of charge (SOC) and power factors of the batteries to determine the optimal switching condition [9].…”

Section: Introductionmentioning

confidence: 99%

Balanced Charging Algorithm for CHB in an EV Powertrain

Gemma,

Tresca,

Formentini

et al. 2023

Energies

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The scientific literature acknowledges cascaded H-bridge (CHB) converters as a viable alternative to two-level inverters in electric vehicle (EV) powertrain applications. In the context of an electric vehicle engine connected to a DC charger, this study introduces a state of charge (SOC)-governed method for charging li-ion battery modules using a cascaded H-bridge converter. The key strength of this algorithm lies in its ability to achieve balanced charging of battery modules across all three-phase submodules while simultaneously controlling the DC charger, eliminating the need for an additional intermediate converter. Moreover, the algorithm is highly customizable, allowing adaptation to various configurations involving different numbers of submodules per phase. Simulative and experimental results are presented to demonstrate the effectiveness of the proposed charging algorithm, validating its practical application.

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