Laboratório de Integração de Sistemas de Energias Renováveis

Featured projects (1)

The TradeRES project will develop and test innovative electricity market designs that can meet society’s needs of a (near) 100% renewable power system. A long-term sustainable market design needs to provide efficient operational and investment incentives for an electricity system that is characterized by a high share of variable renewable energy sources (VREs) by increasing integration with other energy sectors, e.g. transport and hydrogen, and by increasing participation of flexible electricity demand from households to industrial consumers. Furthermore, this market design needs to provide security of supply by ensuring sufficient controllable electricity generation capacity whilst being economically efficient. Finally, despite the variability of solar and wind energy, the market risks should be allocated in an efficient and socially accepted way. This should also safeguard that consumers are not exposed to extreme swings in their energy expenses. In this sense, this project aims at finding market designs that are economically efficient in the above setting. To achieve these goals the project will use an iterative methodology and involve the key players from the energy sector in order to achieve and test the most suitable market designs. The project TradeRES – Tools for the Design and Modelling of New Markets and Negotiation Mechanisms for a ~100% Renewable European Power System, is funded by the EU framework programme for research and innovation Horizon 2020 under the call H2020-LC-SC3-2019-ES-SCC.

Featured research (6)

Driven by climate change concerns, Europe has taken significant initiatives toward the decarbonization of its energy system. The European Commission (EC) has set targets for 2030 to achieve at least 40% reduction in greenhouse gas emissions with respect to the 1990 baseline level and cover at least 32% of the total energy consumption in the European Union (EU) through renewable energy sources, predominantly wind and solar generation. However, these technologies are inherently characterized by high variability, limited predictability and controllability, and lack of inertia, significantly increasing the balancing requirements of the system with respect to historical levels. The flexibility burden is currently carried by flexible fossil-fueled conventional generators (mainly gas), which are required to produce significantly less energy (as low operating cost and CO<sub>2</sub>-free renewable and nuclear generation are prioritized in the merit order) and operate part loaded with frequent startup and shut-down cycles, with devastating effects on their cost efficiency.
This article aims to assess and understand the impact of large-scale integration of the solar photovoltaic (PV) technology in the Iberian electricity market. This impact was evaluated using the projections of the Portuguese solar deployment capacity established in the National Energy and Climate Plan (NECP) 2030 and a multi-agent electricity market simulator designated as MATREM (for Multi-Agent Trading in Electricity Market). Comparing with the values obtained for 2016, the results suggest that the installed capacities projected in the PNEC allow to reduce the average price on the day-ahead spot market by 8.10 €/MWh, reaching 45.52 €/MWh. Considering only the period when solar production is expected (i.e., excluding the night hours), the average price obtained for 2030 is 46.76 €/MWh. With the current installations costs values of solar PV and the values obtained in this work, the results suggest that it is reasonable for a solar power producer to select a market-based remuneration. Thus, in addition to the environmental benefits, the large-scale integration of solar PV technology can have a positive socio-economic impact.
RESUMO: A compreensão e exploração da complementaridade da produção eólica e solar fotovoltaica (PV), podem representar uma oportunidade técnica e economicamente sustentável para aumentar a penetração destas fontes de energia renováveis (FER) nos sistemas electroprodutores. Em Portugal, atualmente já se encontra legislado o conceito de centrais híbridas, onde a complementaridade entre as diferentes FER é crucial para permitir alavancar os níveis de penetração destas tecnologias, incrementando igualmente a rentabilidade dos investimentos podendo auxiliar no cumprimento dos objetivos previstos no Plano Nacional de Energia e Clima 2030 relativamente à capacidade instalada. Neste trabalho é realizada uma avaliação do potencial das centrais híbridas (eólica + PV) em Portugal, considerando o sobreequipamento dos parques eólicos (PEs) atuais usando tecnologia solar PV, permitindo explorar a complementaridade da produção entre estas duas tecnologias e beneficiando das infraestruturas existentes (e.g., subestação). Por comparação, é igualmente avaliado o impacto de adicionar mais capacidade eólica em cada PE atual. Os resultados demonstram que devido às condições atmosféricas predominantes, Portugal apresenta um elevado potencial para adoção do conceito de centrais híbridas em larga-escala. ABSTRACT: Understanding and exploring the complementarity of wind and solar photovoltaic (PV) generation can represent a sustainable opportunity to increase the penetration of these renewable energy sources (RES) into power systems. The implementation of hybrid power plants is already legislated in Portugal, where the complementarity between the different RES is a key aspect that may allow to increase the levels of penetration of these technologies helping to meet the objectives established in the 2030 national energy and climate plan. In this work, an assessment of the potential of hybrid power plants (using wind and solar PV technologies) in Portugal is performed, considering the progressive installation of solar PV technology in the vicinity of the current wind parks locations (overplanting) aiming to explore the complementarity of generation between these two technologies and benefiting from the existing infrastructures (e.g., substation). By comparison, the impact of adding more wind capacity to each current wind park is also analysed. Results showed that Portugal has privileged weather conditions that allow to explore in large-scale the hybrid power plants concept.
Power system operators traditionally use a static transmission line rating method to ensure the electric grid operates under a pre-defined limit temperature of the conductors. This method normally assesses the maximal power capacity of each line using conservative constant weather conditions that usually underestimate the real transmission capacity of overhead power lines. Dynamic line rating (DLR) analysis represent a safe and cost-efficient way to deal with existing congested networks and allowing further integration of current/future renewable generation in many regions.This work applies a DLR tool to identify the power lines’ additional theoretical capacity obtained by using this methodology for two Portuguese regions with distinct conditions regarding i) weather, ii) topography and iii) wind and solar power resource. The capacity values obtained are presented, and a comparison with the traditional values obtained from the static methodology used by the Portuguese system operator is established. Results show that the dynamic approach enables significant gains in the line rating for both regions and its use can be extended to regions with high solar resource since the induced cooling effect is also observed in those regions.
Understanding the spatiotemporal complementarity of wind and solar power generation and their combined capability to meet the demand of electricity is a crucial step towards increasing their share in power systems without neglecting neither the security of supply nor the overall cost efficiency of the power system operation. This work proposes a methodology to exploit the complementarity of the wind and solar primary resources and electricity demand in planning the expansion of electric power systems. Scenarios that exploit the strategic combined deployment of wind and solar power against scenarios based only on the development of an individual renewable power source are compared and analysed. For each scenario of the power system development, the characterization of the additional power capacity, typical daily profile, extreme values, and energy deficit are assessed. The method is applied to a Portuguese case study and results show that coupled scenarios based on the strategic combined development of wind and solar generation provide a more sustainable way to increase the share of variable renewables into the power system (up to 68% for an annual energy exceedance of 10% for the renewable generation) when compared to scenarios based on an individual renewable power source. Combined development also enables to reduce the overall variability and extreme values of a power system net load. Open access at:

Lab head

Ana I. Estanqueiro
  • Unidade de Energias Renováveis e Eficiência Energética
About Ana I. Estanqueiro
  • Ana Estanqueiro received her Elect.Eng. degree from the TUL/1986 where she did her MSc/1991 and PhD/1997 in Mech.Eng. She is Sen.Scientist at LNEG and invited Prof at FCUL (Energy Networks, Wind Energy). The research interests are the grid integration of wind energy and the (planning and operational) methodologies for large system integration of variable renewables. She was Chair of the IEA Wind/06-08, is Pres. of the PT IECCTE88-WT, delegate to IEA-Wind, Rep. to SetPlan EII -Wind and EERA-ESI. Currently, she leads the Renewable Energy and Energy Systems Integration R&D Unit at LNEG.

Members (11)

Fernando Lopes
  • Senior Researcher
Teresa Simões Esteves
  • Laboratório Nacional de Energia e Geologia
Hugo Algarvio
  • Laboratório Nacional de Energia e Geologia
António M. Couto
  • Laboratório Nacional de Energia e Geologia
Jorge Facão
  • Laboratório Nacional de Energia e Geologia
Carlos Rodrigues
  • Laboratório Nacional de Energia e Geologia
Joaquim Duque
  • Laboratório Nacional de Energia e Geologia
David Pereira Loureiro
  • Laboratório Nacional de Energia e Geologia
joao correia
joao correia
  • Not confirmed yet

Alumni (5)

Luis Rodrigues Jr
  • Laboratório Nacional de Energia e Geologia
Duarte Santos
Duarte Santos
Madalena Lacerda
  • Laboratório Nacional de Energia e Geologia