Comparative study of different multilevel DC/DC converter topologies for second-life battery applications (original) (raw)

2013 World Electric Vehicle Symposium and Exhibition (EVS27), 2013

Abstract

ABSTRACT This paper is part of a research project, which aims to investigate the opportunities for using the second life batteries after their replacement from plug-in electric vehicles (PHEVs), hybrid electric vehicles (HEVs) and battery electric vehicles (EVs) for smart grid applications. Batteries which are used for vehicular service cannot be used once that the energy capacity becomes less than 70% - 80%. The remaining capacity of the battery can still be utilized for stationary applications such as powering a building during peak load hours and reducing the environmental pollution. Owner of an electric vehicle would be benefited if a market for the used batteries is established. These batteries are called second life batteries. In these applications, the power electronics converters (PECs) play an important role in the development of a high performance integrated system. It means that the performance of the second life batteries mainly depends on the characteristics of the PECs, which are utilized to achieve the integration of the second life batteries with the smart grid. Therefore, this paper presents a comparative evaluation of different multilevel DC/DC converter topologies that can be used to connect the second life batteries to smart grid. Furthermore, the advantages and drawbacks of the most popular multilevel DC/DC converter topologies are presented in detail. In this paper, a selected harmonic elimination (SHE) technique will be used to realize the control system of the multilevel DC/DC converter, and its influence on the performance of each battery module is analyzed. These topologies are designed and verified by using MATLAB/Simulink environment

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