Modeling And Control Of A Three-phase Isolated Grid-connected Converter For Photovoltaic Applications

This paper describes the modeling and control of a three-phase grid-connected converter fed by a photovoltaic array. The converter is composed of an isolated DC-DC converter and a three-phase DC-AC voltage source inverter The converters are modeled in order to obtain small-signal transfer functions that are used in the design of three closed-loop controllers: for the output voltage of the PV array, the DC link voltage and the output currents. Simulated and experimental results are presented.223215228Barbosa, P.G., Rolim, L.G.B., Watanabe, E.H., Hanitsch, R., Control strategy for grid-connected DC-AC converters with load power factor correction (1998) IEE Proceedings: Generation, Transmission and Distribution, 145 (5), pp. 487-491Buso, S., Mattavelli, P., (2006) Digital Control in Power Electronics, Morgan & Claypool Publishers.De Souza, K.C.A., Coelho, R.F., Martins, D.C., Proposta de um sistema fotovoltaico de dois est́agios conectado ̀a rede eĺetrica comercial, Re-vista Eletr̂onica de Pot̂encia (SOBRAEP) (2007) Brazilian Journal of Power Electronics, 12 (2), pp. 129-136Erickson, R.W., Maksimovic, D., (2001) Fundamentals of Power Electronics, , Kluwer Academic PublishersFranklin, G.F., Powell, J.D., Emami-Naeini, A., (1995) Feedback Control of Dynamic SystemsKubo, M.M., Villalva, M.G., Maraf̃ao, F.P., Rup-Pert, F.E., Ańalise e projeto de PLL de desempenho melhorado baseado em filtro passa-baixas chebyshev inverso (2006) 16th Brazilian Conference on Automatic Control, CBA.KC200GT High Efficiency Multicrystal Photovoltaic Module (Datasheet)., , Kyocera (n.d.)Maraf̃ao, F.P., Deckmann, S.M., Pomilio, J.A., MacHado, R.Q., A software-based PLL model: Analysis and applications (2004) Congresso Brasileiro de Autoḿatica, CBA, Brazilian Conference of Control and AutomationMaraf̃ao, F.P., Deckmann, S.M., Pomilio, J.A., Machado, R.Q., Metodologia de projeto e ańalise de algoritmos de sincronismo PLL, Revista da Sociedade Brasileira de Eletr̂onica de Pot̂encia (SOBRAEP) (2005) Brazilian Journal of Power Electronics, 10, p. 1Middlebrook, R., Small-signal modeling of pulse-width modulated switched-mode power converters (1988) Proceedings of the IEEE, 76 (4), pp. 343-354Middlebrook, R.D., Cuk, S., A general unified approach to modelling switching converter power stage (1976) IEEE Power Electronics Specialists Conference, pp. 18-34Oppenheim, A.V.E., Schafer, R., (1989) Discrete-Time Signal ProcessingVillalva, M.G., Gazoli, J.R., Ruppert, F.E., Comprehensive approach to modeling and simulation of photovoltaic arrays (2009) IEEE Transactions on Power Electronics, 25 (5), pp. 1198-1208Villalva, M.G., Gazoli, J.R., Ruppert, F.E., Modeling and circuit-based simulation of photovoltaic arrays, Revista Eletr̂onica de Pot̂encia (SO-BRAEP) (2009) Brazilian Journal of Power ElectronicsVillalva, M.G., Ruppert, F.E., Buck converter with variable input voltage for photovoltaic applications (2007) Congresso Brasileiro de Eletr̂onica de Pot̂encia (COBEP)Villalva, M.G., Ruppert, F.E., Dynamic analysis of the input-controlled buck converter fed by a photovoltaic array, revista controle & automa̧c̃ao - Sociedade brasileira de autoḿatica (2008) Brazilian Journal of Control and Automation, 19 (4), pp. 463-474Villalva, M.G., Ruppert, F.E., Input-controlled buck converter for photovoltaic applications: Modeling and design (2008) 4th IET Conference on Power Electronics, Machines and Drives. PEMD, pp. 505-50

ESSÊNCIAS BRASILEIRAS E SUA CONSERVAÇÃO GENÉTICA NO INSTITUTO FLORESTAL DE SÃO PAULO

exploração intensa e desordenada de espécies nativas do Brasil, para atender àdemandade madeirada população do país, particularmente do estado de São Paulo, vem ocasionando a extinção de espécies florestais não só de valor comercial, como social e científico. Em decorrência disto, as mesmas começam a apresentar um sério comprometimento de seu potencial genético. [...

The Brazilian Developments On The Regional Atmospheric Modeling System (brams 5.2): An Integrated Environmental Model Tuned For Tropical Areas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)We present a new version of the Brazilian developments on the Regional Atmospheric Modeling System (BRAMS), in which different previous versions for weather, chemistry, and carbon cycle were unified in a single integrated modeling system software. This new version also has a new set of state-of-the-art physical parameterizations and greater computational parallel and memory usage efficiency. The description of the main model features includes several examples illustrating the quality of the transport scheme for scalars, radiative fluxes on surface, and model simulation of rainfall systems over South America at different spatial resolutions using a scale aware convective parameterization. Additionally, the simulation of the diurnal cycle of the convection and carbon dioxide concentration over the Amazon Basin, as well as carbon dioxide fluxes from biogenic processes over a large portion of South America, are shown. Atmospheric chemistry examples show the model performance in simulating near-surface carbon monoxide and ozone in the Amazon Basin and the megacity of Rio de Janeiro. For tracer transport and dispersion, the model capabilities to simulate the volcanic ash 3-D redistribution associated with the eruption of a Chilean volcano are demonstrated. The gain of computational efficiency is described in some detail. BRAMS has been applied for research and operational forecasting mainly in South America. Model results from the operational weather forecast of BRAMS on 5km grid spacing in the Center for Weather Forecasting and Climate Studies, INPE/Brazil, since 2013 are used to quantify the model skill of near-surface variables and rainfall. The scores show the reliability of BRAMS for the tropical and subtropical areas of South America. Requirements for keeping this modeling system competitive regarding both its functionalities and skills are discussed. Finally, we highlight the relevant contribution of this work to building a South American community of model developers. © Author(s) 2017.1011892222014/01563-1, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2014/01564-8, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2015/10206-0, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo306340/2011-9, Conselho Nacional de Desenvolvimento Científico e TecnológicoFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq