Estudo comparativo da confiabilidade de estimativas de irradiação solar para o sudeste brasileiro obtidas a partir de dados de satélite e por interpolação/extrapolação de dados de superfície

Martins, Fernando Ramos; Pereira, Enio Bueno

doi:10.1590/s0102-261x2011000200005

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…One of the benefits of energy generation from the sun is accessibility in remote places, where the costs of implementing a conventional network are unfeasible, in the case of numerous rural properties (Martins & Pereira, 2011).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Photovoltaic Energy System Applied to a Drip Irrigation System

Haupenthal¹,

Siqueira²,

Tokura³

et al. 2018

JAS

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This work aimed to evaluate the performance of a drip irrigation system with photovoltaic energy directly connected to the water pumping system through the irrigation uniformity coefficients using the statistical quality control, with the control chart of Shewhart. The experiment was conducted at the State University of West Parana (UNIOESTE), campus of Cascavel, in the Project CASA (Center of Alternative Energy System Analysis), during six days of open sky. The irrigation system contained four lines with 18 drippers each, collecting the flow of each dripper for five minutes, along with the parameters of temperature and solar radiation. In the energy part, the current and the voltage generated by the panel were analyzed. The main results allowed to evaluate that the flows of the drippers showed changes directly proportional to the decrease or increase of the radiation. Even with the changes in radiation levels during the collection period, the system obtained excellent process capability according to the analyzes of the distribution uniformities. It was also concluded that there was a significant relationship between the coefficients (CUC, DUC and CV) with the process capacity of the flow data. The control plot was adequate to diagnose the treatments. Statistical control proved to be effective for the determination of process variability, thus recommending the use of a drip irrigation system with a solar photovoltaic system directly connected to the pump on open sky days with few clouds due to the lower variability in relation to the graph of control and greater uniformity of water distribution.

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Section: Introductionmentioning

confidence: 99%

Evaluation of a Photovoltaic Energy System Applied to a Drip Irrigation System

Haupenthal¹,

Siqueira²,

Tokura³

et al. 2018

JAS

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“…O conhecimento do comportamento de OCA é necessário em diversas áreas da atividade humana. A seleção e o cultivo de culturas agrícolas, a otimização do conforto ambiental e a eficiência energética de habitações são exemplos relevantes da aplicação desse conhecimento (Martins e Pereira, 2011). Para exemplificar a importância de OCA no BRS, calculou-se as médias de OCA e R n para o intervalo compreendido entre as 6h e 18h, e posteriormente determinou-se a fração R n /OCA, cujo valor obtido foi de 0,68, próximo aos encontrados por Shuttleworth (1988), Giambelluca et al (1997) e Galvão e Fisch (2000) para a região da floresta Amazônica.…”

Section: Resultsunclassified

Balanço de radiação no Pantanal Sul Mato-grossense durante a estação seca

Mesquita

Filho

Karam

et al. 2013

Rev. bras. meteorol.

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Recebido Outubro de 2011 -Aceito Agosto de 2012 RESUMOEste trabalho apresenta a análise das componentes do balanço de radiação à superfície sobre o Pantanal Sul Mato-grossense, a partir de medidas experimentais coletadas durante a estação seca, em setembro de 1999. Neste período, as componentes do balanço de radiação mostraram um ciclo diurno bem definido, associado à densidade de fluxo radiativo de onda curta de 850 Wm -2 ao meio dia. O albedo médio apresentou um comportamento quase especular, com valor mínimo de 0,16±0,02 para ângulos zenitais pequenos. Os valores de emissividade da superfície pantaneira, corrigida para temperatura radiativa de um corpo cinza, variaram entre 0,94 e 0,96. A partir das medidas diretas das densidades dos fluxos radiativos de ondas curtas e longas atmosféricas determinou-se os parâmetros ótimos empregados nas formulações propostas por Monteith e Unsworth (2008), Swinbank (1963) e Brutsaert (1975. Palavras-chave: Balanço de radiação, Experimento Interdisciplinar do Pantanal, albedo, parametrizações radiométricas. ABSTRACT: BUDGET RADIATION ON PANTANAL WETLAND IN MATO GROSSO DO SUL STATE DURING THE DRY SEASONThis work analyses the surface radiation budget components observed over the Pantanal wetland located in the south part of Mato Grosso do Sul State, on September,1999 during the dry season. For this period, these components showed a well defined diurnal cycle, with the shortwave radiation fluxes showing a maximum of 850 Wm -2 at noon. The albedo presents a specular behavior with minimum equal to 0.16±0.02 for small zenithal angle. The land surface emissivity, corrected to a gray body radiative temperature, shows values between 0.94 and 0.96. Direct measurements of shortwave and long-wave density radiative fluxes were used to adjust the optimum parameters on the proposed Monteith and Unsworth (2008), Swinbank (1963) and Brutsaert (1975) formulations.

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“…In order to know the solar energy generation potential in a given location, accurate information is needed regarding the available solar resource (Martins and Pereira, 2011). Such information is also important for the management of the solar systems in operation since it is used in applications such as Maximum Power Point Tracking (MPPT) (Chikh and Chandra, 2015;Scolari et al, 2017) and control of hybrid power generation systems (Mohamed and Mohammed, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The most reliable way to measure solar irradiance is through pyranometers (Martins and Pereira, 2011). However, this sensor requires periodic calibrations and, depending on the photovoltaic system, can be expensive.…”

Section: Introductionmentioning

confidence: 99%

Irradiance Estimation Using Kalman Filter for State-space Systems with Unknown Inputs

Madureira

Chagas

Jesus

2019

Anais Do 14º Simpósio Brasileiro De Automação Inteligente

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This work presents a method for solar irradiance estimation based on Kalman filter for systems subject to unknown inputs. A system composed of a photovoltaic panel, a dc-dc converter and a load was modeled as state space subject to unknown input. The results of the simulated case studies presents a normalized root mean square error (nRMSE) between 0.93% and 14.23% for irradiance estimates, the latter value corresponding to a case that considers adverse situations in applications. In addition, the proposed methodology also estimates the output voltage (nRMSE between 5.66% and 13.15%) and output current (nRMSE between 0.65% and 12.46%) of photovoltaic panels. All these estimates are based on the measurement of a single voltage sensor at the dc-dc converter output. Thus, the KFUI based irradiance estimation is a low cost alternative to the use of pyranometers and has good perspectives for new works on filtering and control of photovoltaic systems.

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Estudo comparativo da confiabilidade de estimativas de irradiação solar para o sudeste brasileiro obtidas a partir de dados de satélite e por interpolação/extrapolação de dados de superfície

Cited by 19 publications

References 4 publications

Evaluation of a Photovoltaic Energy System Applied to a Drip Irrigation System

Evaluation of a Photovoltaic Energy System Applied to a Drip Irrigation System

Balanço de radiação no Pantanal Sul Mato-grossense durante a estação seca

Irradiance Estimation Using Kalman Filter for State-space Systems with Unknown Inputs

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