Battery clamped three-level inverter for renewable energy systems

Vilathgamuwa, D. Mahinda, Jayasinghe, S.D. Gamini, & Madawala, Udaya K. (2011) Battery clamped three-level inverter for renewable energy systems. In Proceedings of the 37th Annual Conference on IEEE Industrial Electronics Society (IECON 2011), IEEE, Melbourne, VIC, pp. 3105-3110.

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Abstract

This paper presents a novel battery direct integration scheme for renewable energy systems. The idea is to replace ordinary capacitors of a three-level flying-capacitor inverter by three battery banks to alleviate power fluctuations in renewable generation. This approach eliminates the need for interfacing dc-dc converters and thus considerably improves the overall efficiency. However, the major problem with this approach is the uneven distribution of space vectors which is due to unavoidable unbalance in clamping voltages. A detailed analysis on the effects of this issue and a novel carrier based pulse width modulation method, which can generate undistorted currents even in the presence of unevenly distributed space vectors, are presented in this paper. A charge/discharge controller is also proposed for power sharing and state of charge balancing of battery banks. Simulation results are presented to verify the efficacy of the proposed system, modulation method and power sharing controller.

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ID Code: 74899
Item Type: Conference Paper
Refereed: Yes
Keywords: DC-DC power convertors, PWM invertors, Power capacitors, Renewable energy sources
DOI: 10.1109/IECON.2011.6119806
ISBN: 9781612849690
ISSN: 1553-572X
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 IEEE
Copyright Statement: Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Deposited On: 12 Aug 2014 00:59
Last Modified: 14 Aug 2014 01:46

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