A direct integration scheme for battery-supercapacitor hybrid energy storage systems with the use of grid side inverter

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2011) A direct integration scheme for battery-supercapacitor hybrid energy storage systems with the use of grid side inverter. In Proceedings of the 26th Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2011), IEEE, Fort Worth, Texas, pp. 1388-1393.

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Battery-supercapacitor hybrid energy storage systems are becoming popular in the renewable energy sector due to their improved power and energy performances. 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 interfacing inverter. These additional dc-dc converters increase power losses, complexity and cost. Therefore, possibility of their direct connection is investigated in this paper. The inverter system used in this study is formed by cascading two 3-level inverters, named as the “main inverter” and the “auxiliary inverter”, through a coupling transformer. In the test system the main inverter is connected with the rectified output of a wind generator while the auxiliary inverter is directly attached to a battery and a supercapacitor bank. The major issues with this approach are the dynamic changes in dc-link voltages and inevitable imbalances in the auxiliary inverter voltages, which results in unevenly distributed space vectors. A modified SVM technique is proposed to solve this issue. A PWM based time sharing method is proposed for power sharing between the battery and the supercapacitor. Simulation results are presented to verify the efficacy of the proposed modulation and control techniques.

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5 citations in Web of Science®

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ID Code: 74903
Item Type: Conference Paper
Refereed: Yes
Keywords: AC generators, DC-DC power convertors, PWM power convertors, Battery storage plants, Power grids, Power transformers, Supercapacitors, Wind power plants
DOI: 10.1109/APEC.2011.5744773
ISBN: 9781424480845
ISSN: 1048-2334
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 IEEE
Deposited On: 11 Aug 2014 23:18
Last Modified: 14 Aug 2014 00:08

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