Jump to ContentJump to Main Navigation
Show Summary Details
More options …

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

See all formats and pricing
More options …
Volume 15, Issue 1


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


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


  • 1.

    Adler MS, Owyang KW, Baliga BJ, Kokosa RA. The evolution of power device technology. IEEE Trans Electron Devices 1984;ED-31:1570–91.CrossrefGoogle Scholar

  • 2.

    Moguilnaia NA, Vershinin KV, Sweet MR, Spulber OI, De Souza MM, Narayanan EM. Innovation in power semiconductor industry: past and future. IEEE Trans Eng Manage 2005;52:429–39.CrossrefGoogle Scholar

  • 3.

    Rodriguez J, Wu B, Bernet S, Pontt J, Kouro S. Multilevel voltage source converter topologies for industrial medium voltage drives. IEEE Trans Ind Electron (Special Section on High Power Drives) 2007;54:2930–45.Google Scholar

  • 4.

    Franquelo LG, Rodriguez J, Leon JI, Kouro S, Portillo R, Prats MA. The age of multilevel converters arrives. IEEE Ind Electron Mag 2008;2:28–39.CrossrefGoogle Scholar

  • 5.

    Bhat AH, Agarwal P. DSP-based implementation of capacitor voltage balancing strategy for a three-phase three-level bidirectional rectifier. IET Power Electron 2009;2:375–86.CrossrefWeb of ScienceGoogle Scholar

  • 6.

    Nabae A, Takahashi I, Akagi H. A new neutral-point-clamped PWM inverter. IEEE Trans Ind Appl 1981;IA-17:518–23.CrossrefWeb of ScienceGoogle Scholar

  • 7.

    Bhagwat P, Stefanovic VR. Generalized structure of amultilevel PWM inverter. IEEE Trans Ind Appl 1983;19:1057–69.CrossrefGoogle Scholar

  • 8.

    Beig AR, Ranganathan VT. Space vector based bus clamped PWM algorithms for three level inverters: implementation, performance analysis and application considerations. IEEE APEC’03, Florida, Vol. 1,2003:559–65.Google Scholar

  • 9.

    Bendre A, Krstic S, Meer JV, Venkataramanan G. Comparative evaluation of modulation algorithms for neutral-point-clamped converters. IEEE Trans Ind Appl 2005;41:634–43.CrossrefGoogle Scholar

  • 10.

    IEEE Recommended practices and requirements for harmonics control in electric power systems. IEEE std. 519, 1992.Google Scholar

  • 11.

    Joetten R, Kehl C. A fast space-vector control for a three-level voltage source inverter. Conference record – European power electronics conference (EPE), Florence, 1991:2:070–2:075.Google Scholar

  • 12.

    Peng D, Lee FC, Boroyevich D. A novel SVM algorithm for multilevel three-phase converters. Conference record – IEEE 33rd annual power electronics specialists conference, Cairns, Vol. 2,2002:509–13.Google Scholar

  • 13.

    Fukuda S, Iwaji Y. A single-chip microprocessor-based PWM technique for sinusoidal inverters. Conference record – IEEE industry applications society annual meeting, Pittsburgh, PA,1988:921–26.Google Scholar

  • 14.

    Fukuda S, Matsumoto Y, Sagawa A. Optimal-regulator-based control of NPC boost rectifiers for unity power factor and reduced neutral point potential variations. IEEE Trans Ind Electron 1999;46:527–34.CrossrefGoogle Scholar

  • 15.

    Dixon JW. Boost type PWM rectifiers for high power applications. Ph.D dissertation, Department of Electrical and Computer Engineering, McGill University, Montreal, QC, June 1988.Google Scholar

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.

Export Citation

©2014 by Walter de Gruyter Berlin / Boston.Get Permission

Comments (0)

Please log in or register to comment.
Log in