Joao Abel Peças Lopes

Joao Abel Peças Lopes
Institute for Systems and Computer Engineering, Technology and Science (INESC TEC) | INESC TEC · Direction

PhD in Electrical Engineering, Aggreagation in Ele

About

310
Publications
97,921
Reads
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14,453
Citations
Citations since 2016
72 Research Items
7607 Citations
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201620172018201920202021202202004006008001,0001,200
201620172018201920202021202202004006008001,0001,200
Introduction
Full Professor (Professor Catedrático) at the Faculty of Engineering of Porto University. Associate Director of INESC TEC. Coordinator of the TEC4Energy initiative at INESC TEC. Member of the Board of the Smart Energy Lab. VP of the Portuguese Association for Electric Vehicles. Supervised more than 28 PhD Thesis. He is co-author or more than 400 publications and co-editor of the book "Electric Vehicles Integration into Modern Power Networks" from Springer. The book is one of the the top 50% most downloaded eBooks from Springer. Main domains of research: large scale integration of renewable power sources in power systems (namely wind generation), power system dynamics, microgrids, smartmetering and integration of electric vehicles in electrical grids. Nominated IEEE Fellow class 2016
Additional affiliations
January 1999 - April 2009
January 1996 - September 1999
Iowa State University
Position
  • Adjoint Professor
January 1989 - present
University of Porto
Position
  • Professor (Full)

Publications

Publications (310)
Article
Assessing the societal contributions of research is not simple, especially for research projects that produce outputs with low technology readiness level. This paper analyses the potential societal impacts of research resulting in technologies with low maturity, but with the potential to be further developed in the long-term. It uses the case of th...
Conference Paper
Portugal, like other nations of the European Union (EU), has developed a national roadmap for hydrogen deployment as a key element of the Portuguese energy transition towards carbon neutrality, generating synergies between the electric and gas systems. Such synergies must be further developed, where hydrogen appears as a renewable energy carrier ca...
Chapter
Electricity demand may vary significantly and consequently the generation side must be adapted to fully supply it. However, the increased penetration of variable renewable energy sources is changing the game by leading to an increase need of load response and load flexibility to face these changes from the generation side. Flexibility is highly rel...
Article
Full-text available
The Smart Transformer (ST) is being envisioned as the possible backbone of future distribution grids given the enhanced controllability it provides. Moreover, the ST offers DC-link connectivity, making it an attractive solution for the deployment of hybrid AC/DC distribution grids which offer important advantages for the deployment of Renewable Ene...
Article
Operating isolated power systems with increasing shares of renewable energy sources requires the integration of battery energy storage systems in order to assure enhanced frequency regulation capabilities. The control mode of power converters interfacing battery energy storage systems to the grid can be based on grid-forming type structures given i...
Article
Full-text available
Portugal has developed a national roadmap for hydrogen deployment as a key element of the Portuguese energy transition towards carbon neutrality, with a major contribution towards the electrification of society, generating synergies between the electric and gas systems. Considering the government goals for hydrogen injection within natural gas infr...
Article
Full-text available
The operation of isolated power systems with 100% converter-based generation requires the integration of battery energy storage systems (BESS) using grid-forming-type power converters. Under these operating conditions, load dynamics influences the network frequency and voltage following large voltage disturbances. In this sense, the inclusion of in...
Article
This paper aims to develop robust Power-Flow solvers able to efficiently handle illconditioned systems. In that sense, those methods based on the Continuous Newton’s philosophy look very promising, however, these methodologies still present some issues mainly related with the computational efficiency or the robustness properties. In order to overco...
Article
Full-text available
In this paper, minimizing the total power losses and enhancing the voltage profile is achieved using a proposed Multi-objective Chaotic Salp Swarm Algorithm (MCSSA) with fuzzy logic decision making. The proposed MCSSA is utilized to determine the optimal size and location of Photovoltaic (PV) in Radial Distribution System (RDS) to minimize the tota...
Article
The integration of distributed Battery Energy Storage Systems (BESS) at the Medium Voltage (MV) and Low Voltage (LV) networks increases the distribution grid flexibility to deal with high penetration of Renewable Energy Sources (RES). In addition, it also enables the deployment of key self-healing functionalities, which allow the islanded operation...
Article
This paper presents two innovative Fault-Ride-Through (FRT) strategies suited for Smart-Transformers (ST) supplying hybrid AC/DC distribution grids within a microgrid environment. The first strategy is suited for ST without a local energy storage, where its Medium Voltage (MV) inverter is operated in grid-tied mode. The proposed approach relies on...
Article
Large horsepower induction motors play a critical role in the operation of industrial facilities. In this respect, the distribution network operators dedicate a high priority to the operational safety of these motor loads. In this paper, the induction motor starting is modeled analytically and in a semi-static fashion. This model is imbedded in a c...
Article
Solid-state transformer-based smart transformer (ST) can provide the dc connectivity and advanced services to improve the grid performance and to increase the penetration of the power electronics interfaced resources (e.g., distributed generators and electric vehicle charging stations) in modern electricity distribution grids. Since the ST is a new...
Article
Full-text available
With the growing concern about decreasing CO 2 emissions, renewable energy sources are being vastly integrated in the energy systems worldwide. This will bring new challenges to the network operators, which will need to find sources of flexibility to cope with the variable-output nature of these technologies. Demand response and multi-energy system...
Article
Large horsepower induction motors play a critical role as industrial drives in production facilities. The operational safety of distribution networks during the starting transients of these motor loads is a critical concern for the operators. In this paper, an analytical and convex optimization model is derived representing the starting transients...
Preprint
Large horsepower induction motors play a critical role as industrial drives in production facilities. The operational safety of distribution networks during the starting transients of these motor loads is a critical concern for the operators. In this paper, an analytical and convex optimization model is derived representing the starting transients...
Preprint
Large horsepower induction motors play a critical role in the operation of industrial facilities. In this respect, the distribution network operators dedicate a high priority to the operational safety of these motor loads. In this paper, the induction motor starting is modeled analytically and in a semi-static fashion. This model is imbedded in a c...
Article
Full-text available
Smart Transformers (STs) are being envisioned as a key element for the controllability of distribution networks in a future context of Renewable Energy Source (RES), Energy Storage System (ESS) and Electric Vehicle (EV) massification. Additionally, STs enable the deployment of hybrid AC/DC networks, which offer important advantages in this context....
Article
Around the world, there is a great concern with the emission of greenhouse gases, creating great interest in turning the energy systems more sustainable. Multi-energy systems are considered as a potential solution to help to this cause and in recent years, it has gained much attention from both research and industry. In this paper, an optimization...
Article
Full-text available
This study presents a conceptual model addressing the establishment of connection requirements for power‐converter‐interfaced renewable generation in islanded power systems. The replacement of fossil‐fuel generation by time‐variable renewable sources implies important changes in the system operation philosophy with respect the dynamic security resu...
Article
The decarbonization of the economy, for which the contribution of power systems is significant, is a growing trend in Europe and in the world. In order to achieve the Paris Agreement's ambitious environmental goals, a substantial increase in the contribution of renewable sources to the energy generation mix is required. This trend brings about rele...
Article
This paper proposes a "grey-box" aggregated dynamic model for active distribution networks, taking into account a heterogeneous fleet of generation technologies alongside their expected behavior when taking into account the latest European grid codes requirements in terms of voltage support services. The main goal of the proposed model and underlyi...
Article
Smart Transformers (ST) are power-electronic based apparatuses that bring new opportunities for defining innovative operating strategies for Medium Voltage (MV) and Low Voltage (LV) distribution grids in future scenarios with increased shares of small-scale generation units. A distinctive advantage of ST is the possibility of connecting a storage d...
Article
Full-text available
Home energy management systems (HEMS) are important platforms to allow consumers the use of the flexibility in their consumption in order to optimize the total energy cost. The optimization procedure embedded in these systems takes advantage of the nature of the existing loads and the generation equipment while complying with user preferences such...
Article
Full-text available
This work consists in assessing a real islanded power system from a dynamic security point of view, to support the planned installation, in the near future, of a hydro power plant with pumped storage, aiming to increase the integration of renewable energy. The analysed hydro power plant will include a Pelton turbine as it is a high‐head hydro facil...
Chapter
This chapter presents the development of the microgrid concept as a solution to overcome some of the negative impacts of massive microgeneration deployment. The microgrid concept appears as an intelligent solution to enable large‐scale integration of distributed energy resources (DER) in low‐voltage (LV) networks without compromising the robustness...
Chapter
Within the smart grid (SG) paradigm, the microgrid (MG) concept has been pointed out as a pathway for the implementation of future smart distribution networks since it extends and decentralizes the distribution network monitoring and control capability and provides key self-healing capabilities to low voltage (LV) networks. The increased interest o...
Article
Full-text available
This paper describes the design of an electromagnetic interference (EMI) filter for the high-frequency link matrix converter (HFLMC). The proposed method aims to systematize the design process for pre-compliance with CISPR 11 Class B standard in the frequency range 150 kHz to 30 MHz. This approach can be extended to other current source converters...
Conference Paper
The amount of distributed generation (DG) the network can host depends on a number of parameters such as the characteristics of the generation units and their daily generation profiles, the characteristics of the network and its configuration, the hourly load profiles as well as national and regional grid code requirements. The high penetration of...
Article
Full-text available
Electric Vehicles (EVs) are increasing the interdependence of transportation policies and the electricity market dimension. In this paper, an Electricity Market Model with Electric Vehicles (EMMEV) was developed, exploiting an agent-based model that analyzes how carbon reduction policy in transportation may increase the number of Electric Vehicles...
Conference Paper
Full-text available
Energy management is a key tool that will enable consumers to optimize their energy use according to different objectives. Allow users to insert their energy use preferences combined with the effective configuration and control of existing devices (loads and microgeneration) is the basis, in this paper, to design adaptable energy optimization algor...
Article
Full-text available
In future power grids, a large integration of renewable energy sources is foreseen, which will impose serious technical challenges to system operators. To mitigate some of the problems that renewable energy sources may bring, new voltage and frequency control strategies must be developed. Given the expected evolution of technologies and information...
Preprint
Full-text available
Electric Vehicles (EVs) are increasing the interdependence of transportation policies and the electricity market. EMMEV (Electricity Market Model with Electric Vehicles) is an experimental agent-based model that analyses how carbon reduction policy in transportation may increase number of Electric Vehicles and how does that would influence on the e...
Conference Paper
The large scale integration of Distributed Energy Resources (DER) at the Low Voltage (LV) distribution network offers new opportunities for the improvement of power quality and network reliability. Currently, the occurrence of large disturbances at the transmission network causing severe voltage sags at the distribution level could lead to the disc...
Preprint
Full-text available
Electric Vehicles (EVs) are increasing the interdependence of transportation policies and the electricity market. EMMEV (Electricity Market Model with Electric Vehicles) is an experimental agent-based model that analyses how carbon reduction policy in transportation may increase number of Electric Vehicles and how does that would influence on the e...
Article
This paper addresses the dynamic stability analysis of an islanded power system regarding the installation of a reversible hydro power plant for increasing renewable energy integration. Being a high-head facility, the hydro power plant consists of separated pumps and turbines (Pelton type). In order to properly support the identification of hydro p...
Article
This work is within the scope of set of consultancy studies made for Portuguese islands. It focuses on the integration of Pumped Storage Power in isolated islands. The paper starts to address several power systems circumstances about two Portuguese islands on the energetic level. For each of these islands, an independent examination of the conditio...
Article
Full-text available
This paper presents a new modulation and control strategies for the high-frequency link matrix converter (HFLMC). The proposed method aims to achieve controllable power factor in the grid interface as well voltage and current regulation for a battery energy storage device. The matrix converter (MC) is a key element of the system, since performs a d...
Article
In this article, we present a holistic framework for the integration of electric vehicles (EVs) in electric power systems. Their charging management and control methodologies must be optimized to minimize the negative impact of the charging process on the grid and maximize the benefits that charging controllability may bring to their owners, energy...
Conference Paper
Full-text available
RESUMO A perspectiva de uma maior participação das fontes eólicas no Sistema Interligado Nacional aponta para a necessidade de incluir a previsão de curto prazo da geração eólica nos procedimentos da operação em tempo real e da programação diária da operação. No presente trabalho apresentam-se duas abordagens para previsão probabilística da geração...
Article
This paper presents a long-term impact evaluation algorithm to assess advanced under frequency load shedding (UFLS) schemes on distribution systems with intentional islanding of distributed generation (DG). The algorithm is based on a combined discrete-continuous simulation (CDCS) model which is utilized to verify the effect of the schemes on relia...
Article
Full-text available
This paper describes a new current control method that enhances the dynamic performance of a single-phase bidirectional AC-DC battery charger to provide a high-frequency link between the grid and electric vehicle. The single-stage structure and the bidirectional power flow make the matrix converter an attractive solution for electric vehicle (EV) b...
Article
Full-text available
This paper deals with integration of energy storage systems into electricity markets. We explain why the energy storage systems increase flexibility of both power systems and energy markets and why such flexibility is desirable, particularly when variable renewable energy sources are being used in existing power systems. As opposed to the existing...
Conference Paper
Full-text available
This paper presents an approach to design the transformer and the link inductor for the high-frequency link matrix converter. The proposed method aims to systematize the design process of the HF-link using analytic and software tools. The models for the characterization of the core and winding losses have been reviewed. Considerations about the pra...
Chapter
The emergence of the smart grid concept led to different proposals for the organization of distributed energy resources (DER), control processes, and management functionalities, instantiated in distinct architectures. Besides the usual scientific publications about the theme, a number of projects, namely, in the Framework Programs FP6 and FP7 and H...
Chapter
Full-text available
In the European Union (EU), the greenhouse emissions from the transportation sector increased around 36% since 1990, which degraded the environmental quality. This sector, owing to its oil dependency, is responsible for around a quarter of EU greenhouse emissions, and the road transportation represents about 20% of the total CO2 emissions in EU. Mo...