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International Journal of Emerging Electric Power Systems

Editor-in-Chief: Sidhu, Tarlochan

Ed. by Khaparde, S A / Rosolowski, Eugeniusz / Saha, Tapan K / Gao, Fei


CiteScore 2018: 0.86

SCImago Journal Rank (SJR) 2018: 0.220
Source Normalized Impact per Paper (SNIP) 2018: 0.430

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1553-779X
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Volume 15, Issue 1

Issues

Innovative Switching Sequences for Sensorless Capacitor Voltage Balancing of Three-Phase NPC Rectifier

Nitin Langer
  • Corresponding author
  • Department of Electrical Engineering, National Institute of Technology Srinagar, Kashmir, Srinagar, Jammu & Kashmir 190006, India
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  • Other articles by this author:
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/ Abdul Hamid Bhat
  • Department of Electrical Engineering, National Institute of Technology Srinagar, Kashmir, Srinagar, Jammu & Kashmir 190006, India
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/ Pramod Agarwal
Published Online: 2014-01-22 | DOI: https://doi.org/10.1515/ijeeps-2013-0139

Abstract

This paper presents a modulation strategy for self-balancing of capacitor voltages of three-phase neutral-point clamped bi-directional rectifier (without feedback controller and sensors). It is identified that regions within a sector are divided into two categories: (a) One small vector among three selected vectors and (b) Two small vectors among three selected vectors. For category (a) positive and negative commutation state of small vector is implemented for equal duty cycle but for category (b) positive and negative commutation state of small vectors is implemented for unequal duty cycle. Based on this observation, an innovative idea is executed to remove these discrepancies. The innovative optimized space vector switching sequences negative and positive commutation state of both the small vectors are implemented for equal duty cycle during each sampling period resulting in self-balancing of DC-bus capacitors with much reduced ripples under steady-state and dynamic load conditions for both rectification and inversion mode of operation. The converter exhibits excellent performance in terms of other critical parameters like unity input power factor, low input current THD, minimum possible switching losses, reduced-rippled and well-regulated DC voltage. The proposed control algorithm is tested through exhaustive simulation of converter using MATLAB Simulink software.

Keywords: space vector pulse width modulation; innovative optimum switching sequence; minimum switching transitions; self-balancing of capacitor voltages

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About the article

Published Online: 2014-01-22


Citation Information: International Journal of Emerging Electric Power Systems, Volume 15, Issue 1, Pages 1–11, ISSN (Online) 1553-779X, ISSN (Print) 2194-5756, DOI: https://doi.org/10.1515/ijeeps-2013-0139.

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