Harmonics induced by triac-based soft starting of an induction motor in a residential air conditioner

  • Authors:

  • S. El Ferik;C. A. Belhadj;L. Benamor;A. S. Hussain

  • Affiliations:

  • Systems Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia;Electrical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia;Electrical Engineering Department, College of Technology at Dammam, Dammam, Saudi Arabia;Systems Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

  • Venue:
  • MIC'06 Proceedings of the 25th IASTED international conference on Modeling, indentification, and control
  • Year:
  • 2006

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Abstract

This work is focusing on the frequency analysis of a window type residential AC unit line current under time-based soft-starting control strategy. The control strategy assumes that only source voltage and current measurements are available. The soft-Starter is based on power electronic devises controlled through a firing signal generated by a programmed microcontroller during the first 500 ms. The frequency content shows the effect of the soft starter in exciting high frequency components of the line current. A Fast Fourier Transform as well as a body diagram analysis show that the high frequencies even or odd multiples of the fundamental line frequency are all excited by the soft-starter approach. Some these frequencies may harm the life cycle of the air-conditioner. The paper describes the experimental setup in details.