Filtros ativos de potência universais baseados em conversores CA/CC/CA.

Abstract

This work presents the development of active power filter topologies universal for single-phase and three-phase systems, with the aim of compensating power reactive power, disturbances caused by the use of non-linear loads, as well as disturbances in the network (sags/overvoltages in the power supply). The proposed systems were

divided into four categories. In the first category are grouped the modern topologies. non-phase units that have two transformers in their structure, one located in the

network side and another on the load side, these topologies have four, five, six and seven arms with controlled keys. The second category are single-phase topologies that present in their structure the use of only one transformer, in this case, topologies with three, four and five arms containing controlled switches were studied. The third category deals with topologies also using a single transformer,

however, unlike the previous category, diodes are used instead of control switches. sides on one of the arms of the configurations. The fourth and final category corresponds to

three-phase topologies with nine arms, in which their structures are series-parallel—series and are originated from the single-phase configurations studied in the previous categories. To the proposed topologies are based on AC/DC/AC converters that generate voltages multi— levels through PWM strategies based on vector space, in order to reduce the THD and WTHD in the system, thus allowing to decrease the switching frequencies controlled switches, reducing losses in converters. The complete systems control, including the developed PWM strategies, will be presented and comparisons between the proposed filters and the filters considered conventional in the literature will be made. Simulation and experimental results will be presented to validate the approaches theoretical.