Browsing by Author "Castro, Rui"
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- Autonomous hydrogen systems: control strategyPublication . Martins, João F.; Viana, Susana; Joyce, A; Pires, Armando; Rangel, C. M.; Sotomayor, João; Castro, RuiThis paper describes the control strategy for a Stand-Alone Energy System Supported by Totally Renewable Hydrogen Production. The basic control strategy considers the pressurized hydrogen gas storage as the energy buffer. The basic logic is that the exceeding renewable energy (solar and wind) is used to accumulate hydrogen, while the fuel cell uses this hydrogen to produce electrical energy within insufficient solar/wind energy. The system is completely autonomous, conceived for off-grid operation. It is composed by solar panels and a wind turbine as primary energy converters, hydrogen tanks as energy buffer and a fuel-cell and an electrolyzer as secondary energy converters.
- How to prepare a power system for 12% wind energy penetration: The Portuguese Case StudyPublication . Estanqueiro, Ana; Castro, Rui; Ricardo, João; Pinto, Medeiros; Rodrigues, Reis; Lopes, J. PeçasThe 2001/77/CE Renewable Energies European Directive together with Kyoto Protocol ratification supported by a Government vision and strong objective on the reduction of external oil dependence put Portugal in the front line to achieve one of the highest wind energy penetrations within ten years time. This paper gives a summarized overview of the Portuguese technical approaches and methodologies followed in order to plan and accomodate the ambitious wind power goals to 2010/2013, preserving the overall quality of the power system.
- How to Prepare a Power System for 15% Wind Energy Penetration: the Portuguese Case StudyPublication . Estanqueiro, Ana; Castro, Rui; Flores, Pedro; Ricardo, João; Pinto, Medeiro; Rodrigues, Reis; Lopes, J. PeçasThe 2001/77/CE Renewable Energies European Directive together with Kyoto Protocol ratification supported by a government vision and strong objective on the reduction of external oil dependence put Portugal in the front line to achieve one of the highest wind energy penetrations within 10 years$1 (B time. This paper gives a summarized overview of the Portuguese technical approaches and methodologies followed in order to plan and accommodate the ambitious wind power goals to 2010/2013, preserving the overall quality of the power system.
- Including a wind energy conversion system model in electromagnetic transients programPublication . Reis, Francisco A.G.S; Estanqueiro, Ana; Castro, Rui; Jesus, J.M. FerreiraDue to the increasing penetration of wind energy, it is necessary to posses design tools that are able to simulate the impact of these installation in distribution grids. Electromagnetic transients programs are suited to deal with these problems, but a detailed wind energy converter model which is able to carry the transient behaviour of this system is also required. In this paper, an interface between two available software package, EMTP and INDUSAT, containing the digital implementation of these features, is presented. This tool will enable the assessment of the influence that both voltage flickering and power oscillations may have in the performance of distribution networks in face of dispersed wind production. A simple case-study is discussed and the main conclusions are commented.
- Influence of Increasing Renewable Power Penetration on the Long-Term Iberian Electricity Market PricesPublication . Leal, Pedro; Castro, Rui; Lopes, FernandoABSTRACT: n recent years, there has been a significant increase in investment in renewable energy sources, leading to the decarbonization of the electricity sector. Accordingly, a key concern is the influence of this process on future electricity market prices, which are expected to decrease with the increasing generation of renewable power. This is important for both current and future investors, as it can affect profitability. To address these concerns, a long-term analysis is proposed here to examine the influence of the future electricity mix on Iberian electricity prices in 2030. In this study, we employed artificial intelligence forecasting models that incorporated the main electricity price-driven components of MIBEL, providing accurate predictions for the real operation of the market. These can be extrapolated into the future to predict electricity prices in a scenario with high renewable power penetration. The results, obtained considering a framework featuring an increase in the penetration of renewables into MIBEL of up to 80% in 2030, showed that electricity prices are expected to decrease by around 50% in 2030 when compared to 2019, and there will be a new pattern of electricity prices throughout the year due to the uneven distribution of renewable electricity. The study's findings are relevant for ongoing research on the unique challenges of energy markets with high levels of renewable generation.
- MISTRAL: A tool to evaluate the impact of wind parks on electric distribution systemsPublication . Silva, F. Marques da; Estanqueiro, Ana; Castro, Rui; Jesus, J.M. Ferreira; Saraiva, J. A. Gil
- Modelling machine interaction in a wind park with regard to stability and regulation: present status of NATO SfS Po-MISTRALPublication . Castro, Rui; Estanqueiro, Ana; Saraiva, J. A. Gil; Gomes, Luís; Jesus, J.M. Ferreira
- Modelling the integration of wind parks onto weak gridsPublication . Estanqueiro, Ana; Jesus, J.M. Ferreira; Castro, Rui; Saraiva, J. A. Gil
- Nato SfS Project Po-Mistral: Status of the experimental validation phasePublication . Castro, Rui; Estanqueiro, Ana; Saraiva, J. A. Gil; Gomes, Luís; Jesus, J.M. Ferreira
- On the effect of the utility grid characteristics in a wind park power output fluctuationsPublication . Estanqueiro, Ana; Aguiar, Ricardo; Saraiva, J. A. Gil; Castro, Rui; Jesus, J.M. Ferreira