Filtro híbrido de dupla sintonia com conversor a três braços aplicado a sistemas trifásicos a quatro fios

Abstract

This dissertation presents the study of a new hybrid filter topology with double tuning with the three-arm converter applied to three-phase systems with four wires. The neutral mains conductor is placed at the midpoint of the split capacitor of the DC bus of the hybrid filter converter. The passive filter is designed to provide a low impedance path for the two harmonics of greater amplitude, and also to compensate for the load’s inductive reactive power. The proposed double tuning hybrid filter structure allows it to decouple the active mesh from its passive mesh, giving the filter greater autonomy and practicality during exchange or maintenance operations in the active stage. The control strategy used to generate the current references for the active filter, was based on the theory of instantaneous active and reactive powers, known as pq theory. The simulation results are obtained using the PSCAD / EMTDC software, while for the experimental results, the control of the converter is done through the DSPACE 1103 platform, with the aid of the ControlDesk graphical interface. Through the modeling and sizing of the proposed hybrid filter, satisfactory results were obtained from a case study regarding the correction of the power factor and minimization of harmonic distortions of current and voltage according to current technical standards. These results validated the hybrid filter as a technically feasible solution for improving the energy quality of a low voltage distribution system.