Estudo e dimensionamento de filtros passivos de sintonia única para atenuação de componentes harmônicas de correntes e tensões elétricas em instalação industrial

Abstract

This work is influenced by the need of greater energetic efficiency and power quality in electrical systems, based on growing projections made in the usage of electronic devices supported by governmental agencies. The chosen fictional electrical system used to analyze and adjust, was based on the electrical installation of the building I of Federal University of Ceará, Campus de Sobral. Using a fictional load, it was possible to verify electrical harmonic currents disagreeing from national and international standards of power quality. To mitigate this distortion in voltage and current wave forms, it is shown the project and simulations of passive single tuned filters to be installed in parallel to a power distribution unit of lower electric voltage that is fed by a transformer of 300 kVA on a substation which connects the university to the electrical grid. The use of passive filters provides the reduction of harmonic distortions shown on simulations, to a desired level taken as reference from the standard IEEE (Institute of Electrical and Electronic Engineers) 519. The simulation includes from the distribution system to the load. Simulation results shows the efficiency in the use of passive single tuned filters to 5th, 7th and 11th harmonic orders.