Conversor trifásico CA-CC de estágio único isolado com correção ativa do fator de potência

Abstract

Many efforts related to power quality, cost reduction and higher efficiency in both singlephase and three-phase converters have been published searching for solutions that meet both safety and reliability standards as they add to the simplicity of implementation. The reduced number of switches in addition to a better efficiency of the converter in terms of loss also reflected in cost reduction for those topology applications. Boost-type three-phase rectifiers are widely used in industry when it comes to energy processing and PFC. Many studies also seek for the use of this converter in different applications dueto its simplicity in terms of topology and contrai. With the evolution of the electrical system applications in arder to to ensure electrical isolation between the network and the system using the DC bus converter in applications such as battery charging for electric vehicles, and application of renewable energies When it’s required, a Four-switch Three-Phase (FSTP) VSR is proposed. Lt is shown that it is possible to suppress the inductor of one of the phases and in addition to reducing the magnetic volume, and also be mathematically modeled as two half-bridge single-phase converters. And só the three-phase converter can be controlled from two current loops for each phase and that share a single voltage grid. The simulation and test results for FSTP VSR is presented in this work, and then the single stage isolated converter with two isolated and independent outputs using the Phase-shift PWM, ensuring its isolation beyond the active correction of the power factor while providing greater versatility in their application. The mathematical model and restrictions are also proved with simulation. The simulation results shows the confirmation of the converter behavior during operation and emphasizes it’s restrictions when compareci to the mathematical analysis performed. Besides, the simulation results meet the IEC standard specifications for THD and also provides efficiency and power factor correction. The proposed converter has an output voltage ripple which, despite not appearing to be a problem for the operation of the converter, a set of parameters can be applied in arder to soften this ripple and avoid the use of higher volume electrolytic capacitors.