Filtros ativos cooperativos em redes de baixa tensão.

Abstract

Today the power quality is a subject of studies in academia, as well as power distribution and generation companies. As a result several researchers around the world join forces searching for solutions and developing systems/equipment for improving the quality of voltage and current waveforms. A shunt active power lter is an e cient way to compensate harmonic current. This paper discusses a control technique based on the detection of current harmonic via their e ect on the voltage waveform. In order to compensate distortions, the active power lter works as a negative resistance for harmonic frequencies present on the voltage. Along with the control of a single lter, this work also investigates the cooperative operation of active power lters. The control technique modi es the gains of the current controllers while monitoring the total harmonic distortion of the voltage, seeking to set the latest to a tolerable value. With this approach there is no requirement for previous knowledge of the parameters of the grid where the lters are installed. Also, each lter will self adjust depending on the voltage distortion to which it subject. A test platform composed of two shunt active power lters was built, and experimental results were obtained in order to validate the control techniques. Operation was tested with a single lter and with the pair in cooperation, obtaining satisfactory results in both setups. Work reviews the literature on active lters, the design test platform, simulation active lters parallel operating in a cooperative way, and results experimental.