Estudo do conversor boost bidirecional para conexão de uma microrrede à rede elétrica

Abstract

This work was developed to do the study of the application of the full bridge bidirectional boost converter in a relatively new area of electronic/electrical engineering that is the creation of a DC microgrid, because such topology shows good functional characteristics when used to connect a DC bus to an AC network. With the intent of to take advantages of the good characteristic of the citied converter, this work shows the equating of the converter and the equating of the components of its controller circuit, as well the obtained results of simulations with the calculate components. Were made some simulations with the converter operating in three different ways: as a rectifier circuit in closed loop, as an inverter circuit operating in open loop, and as an inverter circuit operating in closed loop. After the verification of the good behavior of the converter in the three different ways that it was simulated, then a prototype was assembled whit the goal of obtaining the same results obtained in the simulations in the laboratory. After collecting the experimental data, it was concluded that the proposed converter shows itself promising when used to connect a DC bus of 250 V to the AC grid of 127 V. Because it operated with its nominal power (2 kW) with an elevated efficiency approximately 95% when operating in both ways, as an inverter and as a rectifier, it also operated with an elevated power factor and a harmonic distortion of the current equals to 4.2% as a rectifier, and 3.96% as an inverter.