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ISEL - Eng. Electrotécn. - Comunicações

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http://hdl.handle.net/10400.21/234

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Percorrer ISEL - Eng. Electrotécn. - Comunicações por Domínios Científicos e Tecnológicos (FOS) "Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática"

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  • ESS design and management considering solar PV to fed off-grid EV charger
    Publication . Santos, Diogo; Fonte, Pedro M; Pereira, Rita Marcos Fontes Murta; Barata, Filipe; Almeida, Paulo; Cordeiro, Armando; Luís, Ricardo Jorge Ferreira; Fernao Pires, Vitor
    The increase of electric vehicles creates several challenges to the electric grid, mainly in those with weak power or off-grid. DC microgrids are becoming more and more important in the context of renewable energy sources, where solar PV systems are dominant. In this paper is proposed the design of a DC system to charge electric vehicles using PV generation and a battery storage system. A single DC-DC converter is used to operate the solar PV array with maximum power point tracking method and controls power flow from PV to storage battery and to the EV, operating as DC EV charger. The operation under various loading conditions is discussed. The performance of the proposed solution was simulated using MATLAB/Simulink software.
    2024-07-03Comunicação em conferência Acesso aberto Ver mais
  • Particle swarm optimization-based algorithm for optimal reactive power dispatch
    Publication . Menezes, R.; Fonte, Pedro M; Pestana, Rui
    Optimal Reactive Power Dispatch (ORPD) is very important for the security and economy of power systems. It is a mixed integer nonlinear optimization problem for which metaheuristic methods have proven to be effective in its solution. This paper presents an implementation of the particle swarm optimization algorithm (PSO) for the solution of the ORPD. Another approach, called Fitness-Distance Ratio PSO (FDR-PSO), is implemented to improve the results of the basic PSO. One other version called Second Order PSO (SO-PSO) is implemented for the same purpose. This second-order principle was combined with the FDR-PSO, making it the SO-FDR-PSO. These versions were tested on the IEEE 14 bus and IEEE 39 bus systems. The results show that the tested PSO algorithm and its improved versions can converge to good global optimal solutions (the best optimal solution the PSO could find), effectively solving the ORPD, with increasing degrees of success.
    2025Comunicação em conferência Acesso aberto Ver mais