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Sobre

Sobre

Louelson Afranio Leugirdes de Azevedo Cavalcanti Costa (Membro, IEEE) nasceu em Bananeiras, Brasil. Recebeu os graus de bacharel, mestre e doutor em engenharia elétrica pela Universidade Federal de Campina Grande (UFCG), Brasil,em 2014, 2016 e 2020, respetivamente. Entre Agosto de 2018 e Julho de 2019, esteve no Center for Power Electronics Systems (CPES), Virginia Polytechnic Institute and State University (VT), Blacksburg, VA, USA, como pesquisador visitante. Entre Janeiro de 2020 e Abril de 2021, esteve no Departamento de Engenharia de Computação e Automação (DCA), Universidade Federal do Rio Grande do Norte (UFRN), Brasil, como professor temporário. Desde Agosto de 2021, esta no Centro de Sistemas de Energia (CPES), Instituto de Engenharia de Sistemas e Computadores, Tecnologia e Ciência (INESC TEC), Portugal, como investigador. Membro da Sociedade de Aplicações Industriais (IAS) e da Sociedade de Eletrónica de Potência (PELS) do Instituto de Engenheiro Eletricistas e Eletrónicos (IEEE). Seus interesses de investigação incluem eletrónica de potência, sistemas de energias renováveis e IA aplicada a eletrónica de potência.

Tópicos
de interesse
Detalhes

Detalhes

  • Nome

    Louelson Costa
  • Cluster

    Energia
  • Cargo

    Investigador Auxiliar
  • Desde

    01 agosto 2021
001
Publicações

2021

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

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

Publicação
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

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

Publicação
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.