TAILIEUCHUNG - Battery losses in a MMC for BEVS application

This paper analyses the Modular Multilevel Converter (MMC) topology, where each individual Sub Module (SM), in half bridge configuration, is directly fed by an elementary electrochemical cell. | Send Orders for Reprints to reprints@ 98 BENTHAM OPEN CrossMark The Open Electrical Electronic Engineering Journal Content list available at TOEEJ DOI 1874129001812010098 2018 12 98-109 RESEARCH ARTICLE Battery Losses In a MMC for BEVS Application Adolfo Dannier Gianluca Brando Ivan Spina and Diego Iannuzzi Department of Electrical Engineering and Information Technologies - University of Naples Federico II Naples Italy Received June 26 2018 Revised September 15 2018 Accepted September 27 2018 Abstract Objective This paper analyses the Modular Multilevel Converter MMC topology where each individual Sub Module SM in half bridge configuration is directly fed by an elementary electrochemical cell. Methods The aim is to investigate how the reference voltages influence the cells currents waveforms determining how the active powers and the losses are distributed among the cells. Considering a 2-level Voltage Source Inverter VSI topology working in the same conditions the ratio between the MMC total cells losses and VSI total cells losses is calculated. After showing the system architecture and mathematical model the cells current waveform investigation is presented and detailed both for triangular and sinusoidal voltage reference waveform. Results Finally the results are critically discussed with particular focus on the comparison between the MMC and the VSI topologies. Keywords CMMC topology Battery losses Electrical vehicles Battery cells BMS DC-linked voltage. I. INTRODUCTION Over the last decades several legislative regulations have been introduced with the aim to encourage and stimulate a flawless transition from traditional Internal Combustion IC based vehicles to Battery Electric Vehicles BEVs 1 . Indeed full electric based traction drives have overall efficiency of 80 while offering zero emission of Greenhouse Gases GHG and other air pollutants which instead are the main drawbacks of conventional vehicles. However the .

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