Diode-Clamped Three-Level Inverter-Based Battery/Supercapacitor Direct Integration Scheme for Renewable Energy Systems

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 th...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2011-12, Vol.26 (12), p.3720-3729
Main Authors: Jayasinghe, S. D. Gamini, Vilathgamuwa, D. Mahinda, Madawala, Udaya K.
Format: Article
Language:English
Subjects:
Alternative energy sources
Applied sciences
Batteries
Diode-clamped three-level inverter
Diodes
Direct energy conversion and energy accumulation
direct integration of battery energy storage systems
Electric currents
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Inverters
Modulation
Power electronics, power supplies
Prototypes
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
space vector modulation
Supercapacitors
Support vector machines
Switches
unbalanced operation of diode-clamped three-level inverter
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Summary: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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2148178