Diode-clamped three-level inverter-based battery/supercapacitor direct integration scheme for renewable energy systems
Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2011) Diode-clamped three-level inverter-based battery/supercapacitor direct integration scheme for renewable energy systems. IEEE Transactions on Power Electronics, 26(12), pp. 3720-3729.
This paper describes a diode-clamped three-level inverter-based battery/supercapacitor direct integration scheme for renewable energy systems. The study is carried out for three different cases. In the first case, one of the two dc-link capacitors of the inverter is replaced by a battery bank and the other by a supercapacitor bank. In the second case, dc-link capacitors are replaced by two battery banks. In the third case, ordinary dc-link capacitors are replaced by two supercapacitor banks. The first system is supposed to mitigate both long-term and short-term power fluctuations while the last two systems are intended for smoothening long-term and short-term power fluctuations, respectively. These topologies eliminate the need for interfacing dc-dc converters and thus considerably improve the overall system efficiency. The major issue in aforementioned systems is the unavoidable imbalance in dc-link voltages. An analysis on the effects of unbalance and a space vector modulation method, which can produce undistorted current even in the presence of such unbalances, are presented in this paper. Furthermore, small vector selection-based power sharing and state of charge balancing techniques are proposed. Experimental results, obtained from a laboratory prototype, are presented to verify the efficacy of the proposed modulation and control techniques.
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|Item Type:||Journal Article|
|Keywords:||Diode-clamped three-level inverter, Direct integration of battery energy storage systems, Space vector modulation, Unbalanced operation of diode-clamped three-level inverter|
|Divisions:||Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2013 Institute of Electrical and Electronics Engineers|
|Deposited On:||03 Jun 2014 22:58|
|Last Modified:||13 Jun 2014 01:28|
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