Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
About

About

Louelson Afranio Leugirdes de Azevedo Cavalcanti Costa (Member, IEEE) was born in Bananeiras, Brazil. He received a B.S., M.Sc., and D.Sc. degrees in electrical engineering from the Federal University of Campina Grande (UFCG), Brazil, in 2014, 2016, and 2020, respectively. From August 2018 to July 2019, he was at the Center for Power Electronics Systems (CPES), Virginia Polytechnic Institute and State University (VT), Blacksburg, VA, USA, as a Visiting Scholar. From January 2020 to April 2021, he was at the Department of Computer Engineering and Automation (DCA), Federal University of Rio Grande do Norte (UFRN), Brazil, as a Temporary Professor. Since August 2021, he has been with the Centre for Power and Energy Systems (CPES), Institute for Systems and Computer Engineering, Technology and Science (INESC TEC), Portugal, as a Researcher. He is a member of the Industry Applications Society (IAS) and Power Electronics Society (PELS) of the Institute of Electrical and Electronics Engineers (IEEE). His research interests include power electronics, renewable energy systems, and AI applied to power electronics.

Interest
Topics
Details

Details

  • Name

    Louelson Costa
  • Cluster

    Power and Energy
  • Role

    Assistant Researcher
  • Since

    01st August 2021
001
Publications

2021

The Fast Overvoltage Protection Consideration and Design for SiC-Based Matrix Converters

Authors
Costa, LALDC; Fan, BR; Burgos, R; Boroyevich, D; Chen, WR; Blasko, V;

Publication
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS

Abstract
Matrix converters feature low switching loss, small electromagnetic interference filter, and the potential for achieving high power density. With the employment of wide-bandgap devices, such as silicon carbide devices, the converter performance can be further improved. For a safe operation of matrix converters, an overvoltage protection circuit is necessary to limit the voltage stress of the devices during fault conditions. Due to the high switching speed of silicon carbide devices, the topology and layout design of the overvoltage protection circuit is critical to ensure fast and robust protection for the devices. In this article, a detachable overvoltage protection circuit is designed for each phase leg of the matrix converter. The topology and hardware layout design are elaborated. A 15-kW full silicon carbide implemented matrix converter is built, and the designed overvoltage protection circuits are employed and tested.

2021

X-Type Current Source Converters

Authors
Costa, LALDC; Vitorino, MA; Correa, MBD; Hartmann, LV; Ramalho, AWS;

Publication
IEEE TRANSACTIONS ON POWER ELECTRONICS

Abstract
In this article, a novel topology generalization of a current source converter (CSC) that allows controlling of multiple single-phase ac converters independently sharing the same dc-bus, with the advantage of having a reduced number of conducting switches and a lower dc-bus current, is presented. A conventional n-output/port single-phase CSC that uses the same dc-bus needs to have n H-bridge converters connected in series, which means that it always has 2n conducting switches. The new topology allows generating any n ac output currents always having only (n + 1) conducting switches in a switching period. This represents (1 - 1/n). 50% less conduction losses when compared with the equivalent conventional multiport single-phase CSC. A scalar pulsewidth modulation to control the converters with switching optimization and its generalization is also presented. Details of topology, control strategy, and modulation are presented. Simulation and experimental results are provided to validate the theoretical approach.