فهرست نشریات علمی دسترسی آزاد ایران

This paper presents a harmonic analysis and the design and selection of harmonic filters for a hybrid cooling tower at a refinery plant. This study can be extended to any industrial plant with numerous variable speed drives (VSD).  In this industrial complex, variable speed drives constitute the total load of power transformers. The harmonic analysis of the system shows that harmonic elimination with passive filters is possible only for certain current and power ranges. The studies also indicate that ferro-resonance occurs under light load conditions. This phenomenon creates over-voltages in the network and damages the equipment. The purpose of this paper is to highlight important points in the design or selection of voltage harmonic filters in industrial networks with large non-linear loads.