Browsing by Author "Rosado, J."
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- IEVCC - A Mesh Managed Network for Electric Vehicle ChargingPublication . Baptista, Pedro; Rosado, J.; Silva, Marco; Caldeira, Filipe; Cardoso, FilipeThe implementation and management of Electric Vehicle (EV) charging points in parking spaces (whether in multifamily condominiums or in private company parking lots) presents a challenge, since the available contracted power may be insufficient for the building devices needs and for EV chargers to work simultaneously. The available power is limited to a fixed value generally determined by the expected peak power consumption of the building. An increase in the contracted power leads to unwanted costs and, sometimes, this is not possible without a complete rework of the electrical installation at even higher costs. The available power is not fully used all the time, since not all the buildings devices are always working simultaneously. These spare power can be monopolized by a mesh network of chargers, taking advantage of the full contracted power without increasing costs. In this work we present a manager of a mesh network of chargers that can distribute the available power to an array of chargers based on several conditions, e.g. load balancing, priority of chargers or charging.
- Intelligent Electric Vehicle Charging ControllerPublication . Cardoso, Filipe; Rosado, J.; Silva, Marco; Teixeira, C. J. Coelho; Agreira, C. I. Faustino; Caldeira, Filipe; Baptista, Pedro; Barreto, Francisco; Pereirinha, Paulo G.For domestic consumers, electricity tariffs usually have two components: one is related to the maximum available current/total power (billed in C/day) and the other concerns to the energy consumption (C/kWh). The main switchboard current is usually limited, according to the contracted power level, by way of automatic switches. To avoid main switchboard tripping by current limit violation, Electric Vehicle (EV) owners may decide to increase their contracted power (and the energy bill) or to adopt charging strategies that limit the global consumption (EV plus house needs) to the contracted current/power. In this paper, an Intelligent Electric Vehicle Charging Controller (IEVCC), allowing to use the contracted power to the maximum extent, is presented. A set of user configurable parameters can be used to define the controller behavior, in order to prevent a full switch-off. Two versions are described: a single user version that can be used at private houses and a mesh version that can be used in multi apartment buildings, providing information about consumed energy, time of use, costs and past bills.
- IoT single board computer to replace a home serverPublication . Godinho, António; Cardoso, Filipe; Rosado, J.; Sá, FilipeHome servers are popular among computer enthusiasts for hosting various applications, including Linux OS with web servers, database solutions, and private cloud services, as well as for VPN, torrent, file-sharing, and streaming. Single Board Computers (SBCs), once used for small projects, have now evolved and can be used to control multiple devices in the IoT space. SBCs have become more powerful and can run many of the same applications as traditional home servers. In light of the energy crisis, this study will examine the feasibility of replacing a conventional home server with an SBC while maintaining service quality and evaluating performance and availability. The power consumption of both solutions will be compared.
- A Low Cost and Highly Parameterizable Energy MeterPublication . Rosado, J.; Cardoso, Filipe; Silva, MarcoThe popularity of the Internet of Things (IoT) and demand for smart devices, particularly in the smart home industry, has increased in recent years. As a result, there is a growing need for affordable and functional energy meters to measure electric energy consumption, mainly due to the rise of electric vehicle (EV) sales and energy prices in Europe. In this paper, we present the development of an energy meter that accurately measures voltage, current, active power, frequency, and power factor. The energy meter is designed to provide information to an intelligent EVSE (Electric Vehicle Supply Equipment), allowing users to "plug and forget." We describe the hardware and software of the latest energy monitor version, including an ESP8266 microcontroller, a PZEM-004TV3 energy meter, an OLED display, and a power supply circuit board. We also present some results of the energy meter’s use, highlighting its functionalities and benefits. The paper concludes with insights into a new version planned for the energy monitor. This paper will be of interest to researchers and industry professionals working in the IoT and smart device fields, as well as those interested in energy efficiency and EV charging infrastructure.
- Proposal of a technological cluster to support eLearning platformPublication . Cardoso, Filipe; Godinho, Filipe; Rosado, J.; Caldeira, Filipe; Sá, FilipeDue to the SARS-COV-2 pandemic, educational institutions are immediately faced with a new challenge to adapt, forcing the transition from face-to-face teaching to distance learning in a short period. Distance education supported by technology is a challenge for educational institutions based on binomial technology/teaching. This paper presents a proposal for an e-learning technology structure, supported by a cluster of servers capable of responding to the requirements of distance learning based on the premises of High Availability, High Performance, Load Balancing. The beginning of this study consisted of a literature review to find the various existing technologies, a way to combine them and create a system capable of providing the necessary functionalities, and whose performance could host all the users of an institution simultaneously. The implemented system results from this combination of technologies and allows its capacity to be scaled at any moment according to momentary needs. In technological terms, the solution was based on a free Linux distribution, the Ubuntu Server installed inside a cluster of servers with VMware ESXi, and a cluster of database nodes based on Gallera technology. The eLearning platform used in this study was Moodle because it is one of the resources most used by institutions. The aspects of teaching, provision of content and execution of evaluation tests, were explored. With the implementation of the presented scenario, it was possible to guarantee the High Availability and load balancing of the platform and guarantee a high performance of the whole solution.