Projeto de filtro híbrido a quatro fios para aplicação em rede de distribuição: um estudo de caso

Abstract

The electric distribuition systems are generally afected by energy quality problems in wich the main three are unbalance, harmonic distortion and low power factor. In this way the hybrid filters are used to improve and reduce damages caused by these three factors that are so much important on the properly working of the electric and electronic equipaments conected to these lines. In this paper, it will be realized a modeling of a real electric distribuition line, that have the three problems named above. Therefore a hybrid filter is instaled looking to mitigate the current high harmonic distortion and to improve the power factor. The passive filter is parameterized looking to mitigate the 3a and 5a current harmonic order as well as to rectify the wire power factor. Meanwhile the active filter control, based on pq theory, jointly with the electronic conversor, looks the mitigation of the odd current harmônics until the 13a order. Therefore, to analyze the system with the use of the hybrid filter, the simulation software used was the PSIM. This software was chosen due the possibility of the control algorithym be written in C language through an especific block that will be usefull for an application on a embedded system with a Digital Signal Processor (DSP). After this, the results of the simulations are collected and they show the grown of the medium power factor from 0,842 to 0,947, the decrease of the THD under the 5% limites provided in standards and, also it was registered a decrease on the module of the current on the three fases about 10 A. Besides the ground current decreases about 33 % of the initial.