A Comparison of Non-Isolated High-Gain Three-Port Converters for Hybrid Energy Storage Systems

Ramy Georgious, Jorge Garcia, Pablo Garcia and Angel Navarro-Rodriguez
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Ramy Georgious: LEMUR Group, Department of Electrical Engineering, University of Oviedo, ES33204 Gijon, Spain
Jorge Garcia: LEMUR Group, Department of Electrical Engineering, University of Oviedo, ES33204 Gijon, Spain
Pablo Garcia: LEMUR Group, Department of Electrical Engineering, University of Oviedo, ES33204 Gijon, Spain
Angel Navarro-Rodriguez: LEMUR Group, Department of Electrical Engineering, University of Oviedo, ES33204 Gijon, Spain

Energies, 2018, vol. 11, issue 3, 1-24

Abstract: This work carries out a comparison of non-isolated topologies for power electronic converters applied to Hybrid Energy Storage Systems. At the considered application, several options for three-port circuits are evaluated when interfacing a DC link with two distinct electrical energy storage units. This work demonstrates how the proposed structure, referred to as Series-Parallel Connection, performs as a simple, compact and reliable approach, based on a modification of the H-bridge configuration. The main advantage of this solution is that an effective large voltage gain at one of the ports is attained by means of a simple topology, preventing the use of multilevel or galvanic-isolated power stages. The resulting structure is thoroughly compared against the most significant direct alternatives. The analysis carried out on the switching and conduction losses in the power switches of the target solution states the design constraints at which this solution shows a performance improvement. The experimental validations carried out on a 10 kW prototype demonstrate the feasibility of the proposed scheme, stating its benefits as well as its main limitations. As a conclusion, the Series-Parallel Connection shows a better performance in terms of efficiency, reliability and controllability in the target application of compensating grid or load variations in Non-Isolated Hybrid Storage Systems, with large mismatch in the storage device voltage ratings.

Keywords: hybrid storage systems; power electronic converters; multiport; high gain converters; ultracapacitors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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