A new method of interfacing battery/supercapacitor energy storage systems for distributed energy sources

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2010) A new method of interfacing battery/supercapacitor energy storage systems for distributed energy sources. In Proceedings of the 9th International Power & Energy Conference (IPEC 2010), IEEE, Singapore, pp. 1211-1216.

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Battery-supercapacitor hybrid energy storage systems can achieve better power and energy performances compared to their individual use. These hybrid systems require separate dc-dc converters, or at least one dc-dc converter for the supercapacitor bank, to connect them to the dc-link of the grid connecting inverter. However, the use of such dc-dc converters introduces additional cost and power losses. Therefore, the possibility of direct connection of energy storage systems, to the dc-link of a diode clamped 3-level inverter is investigated in this paper. Even though the proposed topology does not use dc-dc converters, a vector selection method is proposed to produce a similar control flexibility that is found in the separate dc-dc converter topology. The major issue with the proposed system is the imminent imbalance of the neutral point potential. A PWM technique with modified carriers is used to solve this problem. Simulations are carried out using MATLAB/SIMULINK to verify the efficacy of the proposed system.

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ID Code: 75365
Item Type: Conference Paper
Refereed: Yes
Keywords: Energy storage systems interfacing, Hybrid energy storage systems, NPC unbalance, Supercapacitor
DOI: 10.1109/IPECON.2010.5697006
ISBN: 9781424473991
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 IEEE
Deposited On: 21 Aug 2014 22:35
Last Modified: 26 Aug 2014 01:38

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