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The proliferation of residential photovoltaic (PV) prosumers leads to detrimental impacts on the low-voltage (LV) distribution network operation such as reverse power flow, voltage fluctuations and voltage imbalances. This is due to the fact that the strategies for the PV inverters are usually designed to obtain the maximum energy from the panels. The most recent approach to these issues involves new inverter-based solutions. This paper proposes a novel comprehensive control strategy for the power electronic converters associated with PV installations to improve the operational performance of a four-wire LV distribution network. The objectives are to try to balance the currents demanded by consumers and to compensate the reactive power demanded by them at the expense of the remaining converters’ capacity. The strategy is implemented in each consumer installation, constituting a decentralized or distributed control and allowing its practical implementation based on local measurements. The algorithms were tested, in a yearly simulation horizon, on a typical Portuguese LV network to verify the impact of the high integration of the renewable energy sources in the network and the effectiveness and applicability of the proposed approach.
Fermín Barrero-González; Victor Fernão Pires; José L. Sousa; João F. Martins; María Isabel Milanés-Montero; Eva González-Romera; Enrique Romero-Cadaval. Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support. Energies 2019, 12, 972 .
AMA StyleFermín Barrero-González, Victor Fernão Pires, José L. Sousa, João F. Martins, María Isabel Milanés-Montero, Eva González-Romera, Enrique Romero-Cadaval. Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support. Energies. 2019; 12 (6):972.
Chicago/Turabian StyleFermín Barrero-González; Victor Fernão Pires; José L. Sousa; João F. Martins; María Isabel Milanés-Montero; Eva González-Romera; Enrique Romero-Cadaval. 2019. "Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support." Energies 12, no. 6: 972.
The Portuguese Electricity Demand-Side Efficiency Promotion Plan (PPEC) is a voluntary financial mechanism, under which several entities, among them electric utilities, may submit proposals of measures aiming at the reduction of electricity consumption or load management. It is one of the alternative options followed by the Portuguese government to the Energy Efficiency Obligations (EEO) stated in Article 7 of the EU Energy Efficiency Directive. A brief review is presented of the state of the implementation of Article 7 in EU. PPEC is one of the schemes that provide financial support to the implementation of measures whose results contribute to the commitments made under the Portuguese National Energy Efficiency Action Plan (NEEAP), the framework under which the alternatives to the EEO were designed. In the first edition of the PPEC, only three energy services were addressed, while, in the most recent PPEC edition, the sixth, measures addressed nine energy services. In addition, the co-funding by participating consumers and other agents has increased, raising the investment in energy efficiency from actors other than the program administrator. PPEC, although a voluntary mechanism, has proven to be a very competitive one, involving an increasing number of economic agents, measures and addressed energy services.
Jose L. Sousa; António G. Martins. Portuguese Plan for Promoting Efficiency of Electricity End-Use: Policy, Methodology and Consumer Participation. Energies 2018, 11, 1137 .
AMA StyleJose L. Sousa, António G. Martins. Portuguese Plan for Promoting Efficiency of Electricity End-Use: Policy, Methodology and Consumer Participation. Energies. 2018; 11 (5):1137.
Chicago/Turabian StyleJose L. Sousa; António G. Martins. 2018. "Portuguese Plan for Promoting Efficiency of Electricity End-Use: Policy, Methodology and Consumer Participation." Energies 11, no. 5: 1137.
Photovoltaic systems (PV) are now playing an important role in low voltage (LV) grids. Due to this there are impacts in these grids that previously were not expected. Usually these systems are connected to the grid with the goal of transferring the maximum power generated by the solar panel to the grid. However, the power inverter can be controlled in order to also provide ancillary services (AS). In this context this paper presents a study of the impact of PV with AS in LV grids. In this study it will be proposed the injection of the active power in an unbalanced way, taking into consideration the characteristics of the grid. It will also be considered the PV plants providing a reactive power AS. The impact of these AS in a LV grid will be analyzed.
Jose L. Sousa; Claudio J. Brito; V. Fernao Pires. Impact of photovoltaic systems with ancillary services in low voltage grids. 2016 15th Biennial Baltic Electronics Conference (BEC) 2016, 183 -186.
AMA StyleJose L. Sousa, Claudio J. Brito, V. Fernao Pires. Impact of photovoltaic systems with ancillary services in low voltage grids. 2016 15th Biennial Baltic Electronics Conference (BEC). 2016; ():183-186.
Chicago/Turabian StyleJose L. Sousa; Claudio J. Brito; V. Fernao Pires. 2016. "Impact of photovoltaic systems with ancillary services in low voltage grids." 2016 15th Biennial Baltic Electronics Conference (BEC) , no. : 183-186.
José Luis Sousa; António Gomes Martins; Humberto Jorge. Dealing with the paradox of energy efficiency promotion by electric utilities. Energy 2013, 57, 251 -258.
AMA StyleJosé Luis Sousa, António Gomes Martins, Humberto Jorge. Dealing with the paradox of energy efficiency promotion by electric utilities. Energy. 2013; 57 ():251-258.
Chicago/Turabian StyleJosé Luis Sousa; António Gomes Martins; Humberto Jorge. 2013. "Dealing with the paradox of energy efficiency promotion by electric utilities." Energy 57, no. : 251-258.
José Luís Sousa; Antonio Gomes Martins; Humberto M. Jorge. World-wide non-mandatory involvement of electricity utilities in the promotion of energy efficiency and the Portuguese experience. Renewable and Sustainable Energy Reviews 2013, 22, 319 -331.
AMA StyleJosé Luís Sousa, Antonio Gomes Martins, Humberto M. Jorge. World-wide non-mandatory involvement of electricity utilities in the promotion of energy efficiency and the Portuguese experience. Renewable and Sustainable Energy Reviews. 2013; 22 ():319-331.
Chicago/Turabian StyleJosé Luís Sousa; Antonio Gomes Martins; Humberto M. Jorge. 2013. "World-wide non-mandatory involvement of electricity utilities in the promotion of energy efficiency and the Portuguese experience." Renewable and Sustainable Energy Reviews 22, no. : 319-331.
José Luís Sousa; Antonio Gomes Martins; Humberto M. Jorge. Societal objectives as drivers in the search for criteria weights when ranking energy efficiency measures. Energy Policy 2012, 48, 562 -575.
AMA StyleJosé Luís Sousa, Antonio Gomes Martins, Humberto M. Jorge. Societal objectives as drivers in the search for criteria weights when ranking energy efficiency measures. Energy Policy. 2012; 48 ():562-575.
Chicago/Turabian StyleJosé Luís Sousa; Antonio Gomes Martins; Humberto M. Jorge. 2012. "Societal objectives as drivers in the search for criteria weights when ranking energy efficiency measures." Energy Policy 48, no. : 562-575.
This paper describes a new laboratory that was developed to teach undergraduate students at School of Technology of Setúbal/Polytechnic Institute of Setúbal, Portugal, some of the main issues regarding the problem of energy efficiency. Achieving energy efficiency is important since is seen as a powerful and cost-effective tool for achieving a sustainable energy future. So, the need for teaching energy efficiency methodologies is today very important. However, the pedagogical approach where the students revisit previously studied material placed in a practical context is fundamental. Practical experience also increases the interest of students, since it allows connecting the theory to practice. Under this context, this laboratory provides to students experimental work. Several examples of experiments are presented and discussed. Since it is very important that everyone contributes to energy efficiency, this laboratory was also developed in order to receive ordinary people.
José Luís Sousa; Vitor Fernao Pires. A physical laboratory for energy efficiency education. 2010 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering (SIBIRCON) 2010, 412 -416.
AMA StyleJosé Luís Sousa, Vitor Fernao Pires. A physical laboratory for energy efficiency education. 2010 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering (SIBIRCON). 2010; ():412-416.
Chicago/Turabian StyleJosé Luís Sousa; Vitor Fernao Pires. 2010. "A physical laboratory for energy efficiency education." 2010 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering (SIBIRCON) , no. : 412-416.
The energy sector plays a vital role in achieving social and economic development through satisfying the energy needs of the different economic sectors. However, vast majority of power stations burn fossil fuels in order to produce energy. In this way, saving energy and using it efficiently is important. So, in this paper, it will be described a mobile and web-based student learning system for rational use of energy. This system was specially developed to teach undergraduate students at School of Technology of Setúbal / Polytechnic Institute of Setúbal. This system will provide to the students a tutorial, a set of exercises with several oriented questions, interactive animations, assessment tools, a chat room and a game for evaluation purposes. To provide a better mobility, this system has a module to be used with a mobile device.
Rui Neves Madeira; José Luís Sousa; Vitor Fernao Pires; Luís Esteves; O.P. Dias. A mobile and web-based student learning system. Procedia - Social and Behavioral Sciences 2009, 1, 2441 -2448.
AMA StyleRui Neves Madeira, José Luís Sousa, Vitor Fernao Pires, Luís Esteves, O.P. Dias. A mobile and web-based student learning system. Procedia - Social and Behavioral Sciences. 2009; 1 (1):2441-2448.
Chicago/Turabian StyleRui Neves Madeira; José Luís Sousa; Vitor Fernao Pires; Luís Esteves; O.P. Dias. 2009. "A mobile and web-based student learning system." Procedia - Social and Behavioral Sciences 1, no. 1: 2441-2448.
Energy efficiency offers a powerful and cost-effective tool for the achievement of a sustainable energy future. It is therefore never too early to start teaching children about the importance of saving energy. So, in this paper it will be presented a web-based support for Rational Use of Electric Energy Awareness. This tool was specially developed for teaching middle school students. Several resources such as lessons, experiences and games are available. The system is composed of a web tool module that is available through a web server, but also by an off-line module that works as an e-book being easily carried by students.
José Luís Sousa; Rui Neves Madeira; Vitor Fernao Pires. Web-based support for rational use of energy awareness. 2008 34th Annual Conference of IEEE Industrial Electronics 2008, 3556 -3561.
AMA StyleJosé Luís Sousa, Rui Neves Madeira, Vitor Fernao Pires. Web-based support for rational use of energy awareness. 2008 34th Annual Conference of IEEE Industrial Electronics. 2008; ():3556-3561.
Chicago/Turabian StyleJosé Luís Sousa; Rui Neves Madeira; Vitor Fernao Pires. 2008. "Web-based support for rational use of energy awareness." 2008 34th Annual Conference of IEEE Industrial Electronics , no. : 3556-3561.
The paper aims at the presentation of a methodology for energy planning in urban historical centres, using the historical centre of Coimbra, an old Portuguese city, for illustrating purposes. The paper starts with a general perspective of the problems associated with planning activities in historical centres. It describes a methodological approach and general procedures used in the formulation of a mid-term energy plan and presents its main prospective items – identification of objectives and recommended measures, and evaluation of measures’ impacts. It also draws a picture of the standard steps to be given and procedures to be adopted in similar plans. It then presents the formulation of the mid-term energy plan for the historical centre of Coimbra. Difficulties found and anticipated are listed and directions for circumventing them and for future methodology improvements are also presented.
Antonio Gomes Martins; Rui Figueiredo; Dulce Coelho; José Luı́s De Sousa. Energy planning in urban historical centres A methodological approach with a case-study. Energy Policy 1998, 26, 1153 -1165.
AMA StyleAntonio Gomes Martins, Rui Figueiredo, Dulce Coelho, José Luı́s De Sousa. Energy planning in urban historical centres A methodological approach with a case-study. Energy Policy. 1998; 26 (15):1153-1165.
Chicago/Turabian StyleAntonio Gomes Martins; Rui Figueiredo; Dulce Coelho; José Luı́s De Sousa. 1998. "Energy planning in urban historical centres A methodological approach with a case-study." Energy Policy 26, no. 15: 1153-1165.