Space vector based hybrid PWM techniques for reduced current ripple

G. Narayanan, Di Zhao, Harish K. Krishnamurthy, Raja Ayyanar, V. T. Ranganathan

Research output: Contribution to journalArticlepeer-review

279 Scopus citations


This paper investigates certain novel switching sequences involving division of active vector time for space vectorbased pulsewidth modulation (PWM) generation for a voltage source inverter. This paper proposes two new sequences, and identifies all possible sequences, which result in the same average switching frequency as conventional space vector PWM (CSVPWM) at a given sampling frequency. This paper brings out a method for designing hybrid PWM techniques involving multiple sequences to reduce line current ripple. The three proposed hybrid PWM techniques (three-zone PWM, five-zone PWM and sevenzone PWM) employ three, five and seven different sequences, respectively, in every sector. Each sequence is employed in a spatial region within the sector where it results in the lowest rms current ripple over the given sampling period. The proposed techniques lead to a significant reduction in THD over CSVPWM at high line voltages. The five-zone technique results in the lowest THD among real-time techniques with uniform sampling, while the seven-zone technique is the best among real-time techniques with twin sampling rates. The superior harmonic performance of the proposed techniques over CSVPWM and existing bus-clamping PWM techniques is established theoretically as well as experimentally.

Original languageEnglish (US)
Pages (from-to)1614-1627
Number of pages14
JournalIEEE Transactions on Industrial Electronics
Issue number4
StatePublished - Apr 2008


  • Harmonic analysis
  • Harmonic distortion
  • Hybrid PWM
  • Induction motor drive
  • PWM inverters
  • Pulsewidth modulation (PWM)
  • Space vector
  • Space vector modulation
  • Spread spectrum
  • Stator flux ripple
  • Switching sequences

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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