Mário Gomes

Polytechnic Institute of Tomar · Electrical Engineering

Smart cities are aimed at connecting urban infrastructures to enhance the efficiency of their operation and services while taking sustainability goals into consideration. As a result of the intermittency associated with renewable generation, smart city systems such as smart grids and microgrids may not be able to ensure the security of supply. This...

Due to its highest gravimetric energy density, H2 has been regarded as the preferred clean-energy carrier, with potentially environmentally-friendly production through the solar-assisted WS. Since human activities generate enormous amounts of WW, H2 production from this new resource has gained attention as an emergent technology. This paper address...

The PVT technology combines solar PV and solar thermal in the same PVT panel. In this way, both electricity and heat are produced by the PVT panel. Compared to the PV technology and the solar heating technology the PVT technology is in the early market stage with only few small and weak industries active. Best practices for the PVT technology, whic...

Human activities generate enormous amounts of wastewater. The hydrogen production from this new resource has gained attention as an emergent technology. Incorporating photovoltaic energy production with different electrolysis systems which can treat wastewaters and produce hydrogen simultaneously will lead to an environmentally-friendly and sustain...

For quite some time, the work performed by engineers has often been viewed as purely technical and without social implications. This is not only common among people outside of engineering, but also among engineers themselves. The work of engineers in modern society has major implications and effects at the social, economic, and environmental levels...

FCT Organization

Multiple microgrids can operate when interconnected and form a cluster of microgrids, in which each individual system benefits from this cooperation during grid-connected and islanded modes. Therefore, the contents of this paper address the concept of microgrid clusters by providing a review of the literature research conducted towards the project...

The contents of this paper address the concept of net zero energy in industrial and commercial buildings, focusing on the definition which accounts for energy losses by converting each energy carrier used in the building to source energy. Therefore, this paper presents a sample of several source energy conversion factors commonly used in the United...

Multiple microgrids can operate when interconnected and form a cluster of microgrids, in which each individual system benefits from this cooperation during grid-connected and islanded mode. Therefore, the contents of this paper address the concept of microgrid clusters by providing a review of and insight into the literature research made towards t...

During islanded operation mode, microgrids should be able to cooperate with other neighbouring microgrids and an internal energy market may facilitate this cooperation. Therefore, this paper addresses the concept of microgrid clusters by providing a case study to evaluate the cooperation among five industrial microgrids operating in a cluster durin...

In this paper, some aspects of the performance of photovoltaic systems and wind generators are discussed. The performance of technologies for different types of wind generators is briefly explained, including the advantages and disadvantages of each type, and for different wind speeds. Technologies and techniques that improve the performance of dif...

To develop tools to operate industrial microgrids autonomously while exploiting locally PV production and storage capacity.

A microgrid embraces a low-voltage (LV) distribution grid with distributed energy resources (DER) and controllable loads. In the last years, there has been a growing awareness in exploiting microgrids to facilitate DER integration in electric power systems as well as to improve reliability and power quality in distribution grids. A microgrid can op...

This paper addresses the concept of net zero energy and net metering in efficient buildings in order to assist in the study and development of future microgrids for buildings with annual zero energy consumption. There are several definitions for zero energy buildings available in the literature with a distinct set of project goals and interests, bu...

In this work, some aspects of the performance of photovoltaic (PV) systems and wind generators are discussed. The performance of technologies of different types of wind generators is briefly explains, considering the advantages and disadvantages of each type, and for different wind speeds. Technologies that improve the performance of different PV s...

The content of this paper addresses the concept of net zero energy in buildings, focusing on the definition that accounts for energy losses by converting each energy type used by the building to source energy. It presents a sample of source energy conversion factors commonly used in the United States, Canada and in some European countries. In addit...

In almost all countries, electricity reform has been a part of wider policies towards a liberal market economy. The former vertically integrated electricity utilities were restructured and unbundled by a reform process that introduced competition into generation, wholesale, and retail segments of the industry. The transmission and distribution busi...

Over the last few years, the need for electricity has increased in households as new and different appliances are progressively introduced. This increased demand for electricity raises a concern to many developed and developing countries since it is a human’s responsibility to assure a sustainable future. Energy demand management can be an effectiv...

To develop protocols for efficient energy management in industrial microgrids taking special attention to the concept of zero net energy industries.

https://www.mdpi.com/2504-3900/2/23/1472

The content of this paper aims to assist in the development and implementation of microgrids by addressing the challenges and possible solutions for their protection systems. Therefore, an overview of some protection methods available in the literature that can be implemented to ensure a safe and reliable microgrid operation is presented, including...

The content of this paper addresses possible approaches that will eventually allow the development of microgrids for small and medium size industries on a massive scale. Therefore, it addresses in a comprehensive way, the most suitable communication technologies for microgrids in this type of enterprises. Several energy sources that can be implemen...

Several control schemes specifically designed to operate inverter-based industrial microgrids during voltage sags have been recently proposed. This paper first classifies these control schemes in three categories and then performs a comparative analysis of them. Representative control schemes of each category are selected, described and used to ide...

To design architectures of electrical microgrids for small and medium size industries including power components, PV technology, energy storage systems, and communication and metering infrastructures.

This paper analyses the electricity generation through a mini-hydro plant (MHP) and a photovoltaic (PV) system particularly sized for a location in Tomar (Portugal). A system based on this energy mix is adopted to produce hydrogen (H 2) and oxygen (O 2) by electrolysis of water, at high pressure, for energy storage purposes. Some features of the di...

Proceedings of 2.as Jornadas Ibero-Americanas: Geração Distribuida e Microredes Elétricas Inteligentes

MicroGrids represent a new paradigm for the operation of distribution systems and there are several advantages as well as challenges regarding their development. One of the advantages is related with the participation of MicroGrid agents in electricity markets and in the provision of ancillary services. This paper describes two optimization models...

This paper describes part of the research developed by the Power Systems Unit of INESC Porto in the scope of the MoreMicrogrids EU financed project (under the Contract No: PL019864). In this project, and apart from other issues, it was investigated how microgrid agents could participate in a more effective way in electricity markets. In this paper...

Advanced Architectures and Control Concepts for MORE MICROGRIDS (Contract No: PL019864), WORK PACKAGE D – Deliverable DD4, Final Version.

This paper describes an optimization model to be used by System Operators in order to validate the economic schedules obtained by Market Operators together with the injections from Bilateral Contracts. These studies will be performed off-line in the day before operation and the developed model is based on adjustment bids submitted by generators and...

This paper describes a mathematical model and the developed solution algorithm to solve an integrated active / reactive dispatch while retaining competitive aspects. The main drive for this research was the recognition that the introduction of competitive mechanisms lead to a certain extent to a decoupling between active and reactive power scheduli...

The restructuring of power systems has often originated the organization of power system operation planning in a set of chronological sequence of activities that are reasonably decoupled. This means that the Market Operator purely economic schedule together with bilateral contracts is conveyed to the System Operator to be validated from a technical...

This paper describes two new active/reactive dispatch models to be used by System Operators in order to assign reactive power and to validate the economic schedules prepared by Market Operators together with the injections related with Bilateral Contracts. When talking about electricity markets one usually refers to active power markets paying less...

Tese de doutoramento. Engenharia Electrotécnica e de Computadores. 2007. Faculdade de Engenharia. Universidade do Porto

This paper describes a mathematical formulation for the active/reactive dispatch in electricity markets, including a number of issues present in market models used in several countries. Traditional market approaches are implemented considering a sequence of activities namely in terms of active power dispatch and ancillary services. However, these t...

This paper presents a mathematical formulation for the active/reactive dispatch in electricity markets, recognizing that the typical sequential activities organized in terms of pool markets and the dispatch of ancillary services may lead to economic inefficiencies or technical difficulties. The developed model admits that it is known the purely eco...

Ancillary Services play an important role in power systems since they are crucial to ensure the security and quality of operation. However, this issue is sometimes forgotten and power systems tend to be analysed only from the point of view of electricity markets to schedule active power. In several countries, active and reactive dispatches were dec...

Modelos de mercado de energia elétrica

In the scope of the reregulation process of the electric sector, both competitive pool markets and contract mechanisms at the generation and commercialization levels have been emerging. At the wholesale level, and apart from pool structures and bilateral contracts, there are hybrid models in which these two types of structures coexist. In any case,...

Dissertação apresentada para obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores (área de especialização de Sistemas de Energia) na Faculdade de Engenharia da Universidade do Porto