Title :
Harmonics in variable speed fan systems
Author :
El-Koubysi, A.R. ; Morcos, M.M. ; Heber, A.J. ; Li, J.
Author_Institution :
Kansas State Univ., Manhattan, KS, USA
Abstract :
The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30° pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac´s presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental
Keywords :
agriculture; air conditioning; electric motors; harmonics; semiconductor switches; thyristor applications; variable speed drives; ventilation; agricultural buildings; controller; current; fan; fundamental; harmonics; motor; triac; variable speed drives; ventilation; voltage; Displacement control; Equivalent circuits; Fans; Impellers; Induction motors; Power system harmonics; Solid state circuits; Thyristors; Ventilation; Voltage control;
Conference_Titel :
Power Symposium, 1990., Proceedings of the Twenty-Second Annual North American
Conference_Location :
Auburn, AL
Print_ISBN :
0-8186-2115-X
DOI :
10.1109/NAPS.1990.151357
