Dual inverter based battery energy storage system for grid connected photovoltaic systems

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2010) Dual inverter based battery energy storage system for grid connected photovoltaic systems. In Proceedings of the 36th Annual Conference on IEEE Industrial Electronics Society (IECON 2010), IEEE, Glendale, AZ, The United States of America, pp. 3275-3280.

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Abstract

This paper explores a new breed of energy storage system interfacing for grid connected photovoltaic (PV) systems. The proposed system uses the popular dual inverter topology in which one inverter is supplied by a PV cell array and the other by a Battery Energy Storage System (BESS). The resulting conversion structure is controlled in a way that both demand matching and maximum power point tracking of the PV cell array are performed simultaneously. This dual inverter topology can produces 2, 3, 4 and 5 level inverter voltage waveforms at the dc-link voltage ratios of 0:1, 1:1, 2:1 and 3:2 respectively. Since the output voltage of the PV cell array and the battery are uncorrelated and dynamically change, the resulting dc-link voltage ratio can take non-integer values as well. These noninteger dc-link voltage ratios produce unevenly distributed space vectors. Therefore, the main issue with the proposed system is the generation of undistorted current even in the presence of unevenly distributed and dynamically changing space vectors. A modified space vector modulation method is proposed in this paper to address this issue and its efficacy is proved by simulation results. The ability of the proposed system to act as an active power source is also verified.

Impact and interest:

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ID Code: 75536
Item Type: Conference Paper
Refereed: Yes
Keywords: Dual inverter, Energy storage system interfacing, Grid connected PV systems, Variable dc-link voltage ratio
DOI: 10.1109/IECON.2010.5675038
ISBN: 9781424452255
ISSN: 1553-572X
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 IEEE
Deposited On: 25 Aug 2014 22:29
Last Modified: 27 Aug 2014 02:31

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