22 documents found, page 1 of 3
A conceptual design of multibus architectures for smart homes in residential DC...
Coelho, Sérgio; Rocha, João; Sepulveda, Manuel J.; Monteiro, Vítor Duarte Fernandes; Afonso, João L.Hand to hand with the ongoing energy transition, this paper proposes a conceptual multibus architecture for smart homes, designed to improve flexibility, efficiency, and scalability of residential DC microgrids. The proposed solution centralizes DC distribution at 800 VDC using the first conversion stage of a solid-state transformer (SST), while the subsequent two stages are allocated at the smart home level. I...
Design and Implementation of a DC–DC resonant LLC converter for electric vehicl...
Rocha, João; Amin, Saghir; Coelho, Sérgio; Rego, Gonçalo; Afonso, João L.; Monteiro, Vítor Duarte FernandesThis article presents the design and implementation of a DC–DC power converter for application in electric vehicle (EV) fast-charging systems. The prototype is of the resonant LLC type and consists of a high-power transformer operating at high frequency, which is an essential feature for the adequate behavior of the EV fast-charging system as a whole. As demonstrated throughout the article, by using this conver...
A battery-oriented multiport DC-DC converter for enhanced power management in SST
Coelho, Sérgio; Monteiro, Vítor Duarte Fernandes; Afonso, João L.In response to the growing demand for technological solutions aimed at enhancing the stability of electrical power systems, this paper proposes a new approach to power flow management in solid-state transformers (SST). Within the context of smart grids, the increasing integration of renewable energy sources (RES) introduces greater uncertainty and variability, making it critical to balance mismatched generation...
A novel unified single-phase active rectifier topology with advanced operating ...
Monteiro, Vítor Duarte Fernandes; Costa, Filipe; Coelho, Sérgio; Afonso, João L.Active rectifiers are of paramount importance for guaranteeing power quality in smart grids, due to their characteristics of sinusoidal current consumption and unitary power factor operation. In this paper, a novel unified single-phase (USP) front-end converter is proposed for active rectifier applications in smart grids, offering additional advantages and a set of relevant features besides the conventional act...
Solid-state transformer: the catalyst for resilient and sustainable smart grids
Coelho, Sérgio; Dionizio, Anderson; Cunha, José; Monteiro, Vítor Duarte Fernandes; Afonso, João L.This paper explores the transformative role of solid-state transformers (SSTs) in enhancing the performance of smart grids and microgrids, focusing on their technological capabilities and contribution to sustainability. Renowned for their flexibility, adaptability, and scalability, SSTs are crucial for improving the resilience of electrical systems, particularly in dynamic infrastructures with multiple load and...
An active balancer of currents for bipolar DC power grids
Monteiro, Vítor Duarte Fernandes; Coelho, Sérgio; Amin, Saghir; Awais, Muhammad; Brito, Pedro; Afonso, João L.DC power grids (DCPGs) are gaining more significance, predominantly due to the natural DC operation of technologies such as renewables, energy storage systems, and electric vehicles. Particularly, thanks to power electronics, bipolar DCPGs are gaining more preponderance since they enable reducing power losses, increasing power density, and averting power quality problems of AC power grids. Also, by adding power...
Full-bridge vs. T-Type: A comprehensive comparison of three-phase power convert...
Soares, Tiago; Pereira, Pedro; Muhammad, Saghir Amin; Awais, Muhammad; Coelho, Sérgio; Afonso, João L.; Monteiro, Vítor Duarte FernandesElectric mobility has gained more attention within the transportation sector, where the development of innovative EV chargers must accomplish with the requirement of reduced charging times. Therefore, the implementation of more efficient and faster EV chargers is of utmost importance. This paper presents a comprehensive comparison between two topologies of three-phase AC-DC power converters: a full-bridge and a...
Examining the technological and environmental impact of solid-state transformer...
Coelho, Sérgio; Cunha, José; Monteiro, Vítor Duarte Fernandes; Afonso, João L.This paper assesses the impact of incorporating solid-state transformers (SST) into smart grids and microgrids, analyzing their benefits in both technological and environmental dimensions. Renowned for their flexibility and transformative capabilities, SST demonstrate the aptitude to enhance interoperability among diverse technologies. Notable features include fault tolerance mechanisms, the mitigation of power...
A novel DC-DC multi-level converter for interfacing an SST and a bipolar DC grid
Monteiro, Vítor Duarte Fernandes; Coelho, Sérgio; Afonso, João L.The pioneering models of future power grids are driving the implementation of innovative power electronics technologies aimed at power management. In this revolutionary framework, the applicability and architecture of a novel DC-DC multi-level converter (MLC) interfacing a solid-state transformer (SST) and forming a hybrid bipolar DC grid is proposed in this paper. The proposed DC-DC MLC has as worthy features ...
Economic and efficiency analysis of a new converter topology for multifunctiona...
Machado, Martim; Coelho, Sérgio; Monteiro, Vítor Duarte Fernandes; Afonso, João L.The paradigm of smart grids has launched a precedent on the methods used to develop the new electrical power grids, related to their efficiency and overall cost. With that assessment in mind, this paper proposes an overhaul on the typical topologies related to the power electronics converters that are used to connect key technologies within a smart grid (i.e., a renewable and an energy storage system). Instead ...