DSpace Collection:http://hdl.handle.net/10174/144142024-03-28T20:12:20Z2024-03-28T20:12:20ZProgresses in the development of an integrated forecasting model of solar radiation and photovoltaic power output without using onsite measurementsPereira, SaraCanhoto, PauloSalgado, RuiOozeki, Takashihttp://hdl.handle.net/10174/356772023-11-22T09:56:41Z2023-02-01T00:00:00ZTitle: Progresses in the development of an integrated forecasting model of solar radiation and photovoltaic power output without using onsite measurements
Authors: Pereira, Sara; Canhoto, Paulo; Salgado, Rui; Oozeki, Takashi
Abstract: Renewable resources, and consequently the generated energy, are especially variable, which makes finding an accurate balance between electricity generation and consumption at any moment challenging in the absence of reliable large capacity energy storage systems. Thus, having an accurate forecasting of the generated energy allows for a more efficient management of the electric grid comprising various energy sources. This work presents the study of all fundamental models necessary for the forecasting of
photovoltaic power output when there is no measuring instrumentation on site, namely: weather forecasting model, direct normal irradiance forecast improvement model, transposition model, photovoltaic module temperature and power output model and inverter model. The weather forecasting model used in this work is the numerical weather prediction model of the European Centre for Medium-range Weather Forecasts which produces forecasts twice a day with temporal resolution of 1 hour and 0.125° of horizontal resolution in a global grid. Methods for temporal and spatial downscaling are applied to obtain 10-minute values of the forecasted variables for the desired location. The forecasts of direct normal irradiance (DNI) show higher errors (157.16 W/m2 of mean absolute error - MAE - for
forecast day 1) than global horizontal irradiance (GHI, MAE of 63.63 W/m2) and thus a corrective algorithm based on artificial neural networks (ANN) was developed to improve these forecasts achieving an MAE of 130.94 W/m2 for forecast day 1. The transposition model converts DNI and diffuse horizontal irradiance (DIF) into irradiance on the tilted plane (GTI). This is done by using transposition coefficients on the direct, diffuse and reflected component of solar irradiance. In this work some of the most employed analytic models for the determination of the diffuse transposition coefficient are compared, being the modified Bugler model selected. In the case of
photovoltaic power plants, which are composed of various rows of panels, there is sometimes obscuring of the sun by the front rows over the second and subsequent rows affecting the beam radiation received by these. There is also obscuring of the sky dome affecting the diffuse radiation and obscuring of the reflected radiation from the ground between rows. In this work a transposition model for rows other than the first based on the works of Varga and Mayer (2021) and Tschopp et al. (2022) was developed and is now being
evaluated. The photovoltaic power output is very dependent not only on the irradiance on the solar panels but also on their temperature. Thus, a model to determine the temperature of the panel is essential when there are no measurements available. Most models used in the literature are steady-state and empirical which means they can be biased towards a specific technology or location. Besides comparing the most commonly used empirical models, a physical transient model for the determination of the photovoltaic panel temperature was developed. The integration of these models with various non-empirical power output models was evaluated. Finally, the efficiency of the power inverter is considered to obtain the power output supplied to the electric grid.2023-02-01T00:00:00ZHydrogen geological storage and interactions in porous media of subsurface geologyPereira, PedroCarneiro, JúlioCanhoto, PauloPedro, JorgeAbdoulghafour, Halidihttp://hdl.handle.net/10174/356762023-11-22T09:55:04Z2023-02-01T00:00:00ZTitle: Hydrogen geological storage and interactions in porous media of subsurface geology
Authors: Pereira, Pedro; Carneiro, Júlio; Canhoto, Paulo; Pedro, Jorge; Abdoulghafour, Halidi
Abstract: The national and European hydrogen strategies rely on producing vast amounts of green hydrogen, part of which will have to be stored in geological formations. While storage in salt cavities is a mature technology, the porous media is prone with challenges. Funded by FCT, H2GeoStore project will address impacts on hydrogen storage efficiency and seal integrity in saline aquifer reservoirs. H2GeoStore outcomes aim providing relevant insights for future projects towards the climate and energy goals.2023-02-01T00:00:00ZGeochronological data for the Pre-Mesozoic basement located west of the Porto-Tomar Fault: geodynamic implicationsBento dos Santos, TelmoChichorro, MartimCarvalho, DiogoCachapuz, PedroSolá, RitaDantas, E.Romão, JoséMoreira, NoelDias da Silva, ÍcaroClavijo, EmílioDiez-Montes, AlejandroValverde, P.Santos, R.V.Linnemann, Ulfhttp://hdl.handle.net/10174/353522023-07-24T14:25:47Z2023-06-30T23:00:00ZTitle: Geochronological data for the Pre-Mesozoic basement located west of the Porto-Tomar Fault: geodynamic implications
Authors: Bento dos Santos, Telmo; Chichorro, Martim; Carvalho, Diogo; Cachapuz, Pedro; Solá, Rita; Dantas, E.; Romão, José; Moreira, Noel; Dias da Silva, Ícaro; Clavijo, Emílio; Diez-Montes, Alejandro; Valverde, P.; Santos, R.V.; Linnemann, Ulf
Abstract: Geochronological data from the pre-Mesozoic basement of the Lusitanian Basement (West of the Porto-Tomar Fault) was obtained. Results show a predominant Cadomian/Pan-African and Eburnean inheritance/source, placing this sector as a peri-Gondwanan domain. However, two major differences can be seen in the data: samples with a clear absence in Mesoproterozoic ages vs. samples with a clear presence of these ages and Silurian-Devonian ages. If the former show clear signs of affinity with the Ossa-Morena Zone, the latter are similar to the South Portuguese Zone, being one of the samples, probably deposited in the Middle-Upper Devonian, interpreted as having a mixed source.2023-06-30T23:00:00ZOrganic petrography applied to the study of thermal maturation of black shales and implications to Cu mineralization in Ossa Morena ZoneLaranjeira, VanessaRibeiro, JoanaMoreira, NoelNogueira, PedroFlores, Deolindahttp://hdl.handle.net/10174/353512023-07-24T14:24:54Z2023-06-30T23:00:00ZTitle: Organic petrography applied to the study of thermal maturation of black shales and implications to Cu mineralization in Ossa Morena Zone
Authors: Laranjeira, Vanessa; Ribeiro, Joana; Moreira, Noel; Nogueira, Pedro; Flores, Deolinda
Abstract: A refletância da matéria orgânica é um parâmetro petrográfico robusto na determinação da maturação térmica de rochas permitindo estimar paleotemperaturas e avaliar a evolução térmica associada aos processos que afetaram estas rochas. Este trabalho tem como objetivo determinar a maturação térmica de xistos negros espacialmente associados a mineralizações de Cu na Faixa Metalogénica de Sousel-Barrancos (Zona Ossa Morena). Os resultados da refletância da matéria orgânica destas rochas permitiram estimar paleotemperaturas de até cerca de 350°C e identificar um padrão irregular de maturação associado à circulação de fluidos hidrotermais característicos da instalação de veios mineralizados de Cu em Miguel Vacas.2023-06-30T23:00:00Z