Conversor CA-CA DAB monofásico com correção de fator de potência aplicável a estabilizadores de tensão

Abstract

This work proposes the study and development in a simulation environment of a single-phase indirect AC-AC converter with power factor correction and high-frequency insolation feasible to AC voltage regulators. The topology structure is based on the converter dual active bridge (DAB) associated with the three-state switching cell (3SSC). The input rectifier ensure sinusoidal current and a high power factor. The output inverter ensures regulated voltage with sinusoidal shape, low harmonic distortion and fast dynamic response. The control of the power flow between rectifier and inverter is done by the phase-shift modulation technique. The commitment to power quality and the ability to mitigate disturbances at power grid, enable the topology to AC voltage regulators. A theoretical analysis of the converter is developed, showing the modulation technique and the control strategy. Voltage sensors, current sensors and digital controllers are designed. Finally, the study is verified through simulation results. The power factor at the rectifier input is 0.991. The output voltage has a THD lower than 1% for a resistive load and 4.96% for a non-linear load, complying with the limits established by the IEEE Std 510-2004 standard. The dynamic behavior of the converter is performed for load steps and disturbances in the grid. The converter presents excellent response to sag of 30% and harmonic distortion of 17% in the grid.