Theoretical analysis and experimental validation of a novel multilevel inverter topology for renewable energy interfacing applications

Gupta, Krishna Kumar; Jain, Shailendra

doi:doi:10.1063/1.3683515

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Journal of Renewable and Sustainable Energy / Volume 4 / Issue 1 / REGULAR ARTICLES

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J. Renewable Sustainable Energy 4, 013113 (2012); http://dx.doi.org/10.1063/1.3683515 (15 pages)

Theoretical analysis and experimental validation of a novel multilevel inverter topology for renewable energy interfacing applications

Krishna Kumar Gupta and Shailendra Jain

Department of Electrical Engineering, Maulana Azad National Institute of Technology, Bhopal, India

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(Received 20 June 2011; accepted 2 January 2012; published online 14 February 2012)

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Abstract

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This paper presents a new topological structure for symmetrical cascaded multilevel inverters. The proposed circuit consists of cross-connected separate symmetrical DC sources which can generate number of levels equal to that of a cascaded H-bridge topology with reduced number of power switches. It is especially suitable for utility interfacing of renewable energy sources. It also offers the possibility of a transformer less and filter less operation. The working principle of the proposed topology is explained with the help of a single-phase five level inverter. Simulation results are obtained in matlab/simulink environment and are verified experimentally on a laboratory prototype. An exhaustive comparison of the proposed topology is made with the classical cascaded H-bridge topology, especially with the considerations of conduction losses and cost-effectiveness. The proposed topology results in the reduction of number of power switches, losses, installation area, and converter cost and thus can be implemented as an effective and efficient power electronic interface for renewable sources of energy with the utility grid.

Article Outline

INTRODUCTION
MLI TOPOLOGIES AND OUTPUT VOLTAGE EXPRESSIONS
1. Cascaded H-bridge topology
2. Description of proposed topology
SIMULATION STUDIES AND COMPARATIVE ANALYSIS
1. Case I
2. Case II
3. Comparative analysis of proposed topology with CHB topology
  1. Number of levels
  2. Maximum output voltage
  3. Number of power switches
  4. Number of devices conducting simultaneously
  5. Holding voltages
  6. Modularity
  7. Costs
EXPERIMENTAL VERIFICATION
CONCLUSION

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KEYWORDS, PACS, and IPC

Keywords

bridge circuits, invertors, renewable energy sources

PACS

84.70.+p

High-current and high-voltage technology: power systems; power transmission lines and cables

International Patent Classification (IPC)

H02M
Apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems; Conversion of dc or ac input power into surge output power; Control or regulation thereof

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3683515

PUBLICATION DATA

ISSN

1941-7012 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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