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3 Transactions on Environment and Electrical Engineering

3 2017

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Simulation and analysis of an isolated full-bridge DC/DC boost converter operating with a modified perturb and observe maximum power point tracking algorithm

Matias C. A., Medeiros G. P., Moraes P. H. F., Fernandes B. de A., Alves A. J., Calixto W. P., Furriel G. P.

Transactions on Environment and Electrical Engineering

2017

Vol. 2, No. 2

45--50

The purpose of the present study is to simulate and analyze an isolated full-bridge DC/DC boost converter, for photovoltaic panels, running a modified perturb and observe maximum power point tracking method. The zero voltage switching technique was used in order to minimize the losses of the converter for a wide range of solar operation. The efficiency of the power transfer is higher than 90% for large solar operating points. The panel enhancement due to the maximum power point tracking algorithm is 5.06%.

Metric for calculation of system complexity based on its connections

Paiva J. R. B., Gomes V. M., Rodrigues B. A., Silva L. F. A., Aniceto B. C. M., Furriel G. P., Calixto W. P.

Transactions on Environment and Electrical Engineering

2017

Vol. 2, No. 1

67--73

This paper proposes a methodology based on system connections to calculate its complexity. Two study cases are proposed: the dining Chinese philosophers’ problem and the distribution center. Both studies are modeled using the theory of Discrete Event Systems and simulations in different contexts were performed in order to measure their complexities. The obtained results present i) the static complexity as a limiting factor for the dynamic complexity, ii) the lowest cost in terms of complexity for each unit of measure of the system performance and iii) the output sensitivity to the input parameters. The associated complexity and performance measures aggregate knowledge about the system.

Estimate of geopressures using conformal mapping in eccentric wells

Silva U. F., Júnior M. I. de Q., Lemos S., Silva A. H. F., Furriel G. P., Segatti N., Calixto W. P.

Transactions on Environment and Electrical Engineering

2017

Vol. 2, No. 2

1--10

The purpose of this work is to calculate Surge and Swab pressures in eccentric wells. Analysis of the phenomenon, in which fluid is confined between two eccentric cylinders, are made. Conformal mapping calculations is used to lead the original eccentric domain into equivalent concentric domain, since usual models only make calculation for concentric geometries. The results of this study, using the proposed methodology, are presented and discussed.