Research Article Open Access

Harmonics Phase Shifter for a Three-Phase System with Voltage Control by Integral-Cycle Triggering Mode of Thyristors

I. Badran, A.L. Mahmood and M.T. Lazim

Abstract

In integral-cycle triggering mode of voltage control, subharmonic as well as higher order harmonic components are generated in the load voltage waveforms of a three-phase system. These harmonic components are found to be unbalanced in phase displacement. The correction of the unbalanced phase displacement angles of a particular subharmonic or higher order harmonic for this type of triggering is investigated to solve the limitation of use of this important type of control as a drive and many other industrial applications. In this research a new phase shifting technique is proposed to correct the unbalanced phase displacement angles in the three-phase system. This technique depends on shifting the waveforms of either phase B or phase C or both by multiples of 2π. A microprocessor-based harmonic phase shifter is designed and tested with three-phase resistive and induction motor loads. It is found that there is a well agreement between the theoretical and experimental results and it is believed that the major problem of harmonics phase unbalances associated with the integral-cycle triggering mode of thyristors when used with three-phase circuits have been solved in the present research.

American Journal of Applied Sciences
Volume 5 No. 11, 2008, 1580-1587

DOI: https://doi.org/10.3844/ajassp.2008.1580.1587

Submitted On: 30 November 2007 Published On: 30 November 2008

How to Cite: Badran, I., Mahmood, A. & Lazim, M. (2008). Harmonics Phase Shifter for a Three-Phase System with Voltage Control by Integral-Cycle Triggering Mode of Thyristors . American Journal of Applied Sciences, 5(11), 1580-1587. https://doi.org/10.3844/ajassp.2008.1580.1587

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Keywords

  • Harmonics
  • integral cycle control
  • power electronics
  • phase angle correction
  • phase shifter
  • ac motor speed control