Yang D.,National University of Singapore |
Jirutitijaroen P.,National University of Singapore |
Walsh W.M.,Solar Energy Research Institute of Singapore
Solar Energy | Year: 2012
We apply time series analysis to forecast next hour solar irradiance including cloud cover effects. Three forecasting methods are proposed using different types of meteorological data as input parameters, namely, global horizontal irradiance (GHI), diffuse horizontal irradiance (DHI), direct normal irradiance (DNI) and cloud cover. The first method directly uses GHI to forecast next hour GHI through additive seasonal decomposition followed by an Auto-Regressive Integrated Moving Average (ARIMA) model. The second method forecasts DHI and DNI separately using additive seasonal decomposition followed by an ARIMA model and then combines the two forecasts to predict GHI using an atmospheric model. The third method considers cloud cover effects. An ARIMA model is used to predict cloud transients. GHI at different zenith angles and under different cloud cover conditions is constructed using nonlinear regression, i.e., we create a look-up table of GHI regression models for different cloud cover conditions. All three methods are tested using data from two weather stations in the USA: Miami and Orlando. It is found that forecasts using cloud cover information can improve the forecast accuracy. © 2012 Elsevier Ltd.
News Article | November 28, 2016
SHANGHAI, Nov. 28, 2016 /PRNewswire/ -- Upsolar (Singapore) Pte. Ltd., a subsidiary of Upsolar, a leading provider of solar PV modules and services, Koine a design company specializing in floating technology, and Upsolar's local installation partner CW, recently deployed a floating PV system at Tengeh Reservoir in Singapore. The system is part of the joint project overseen by the Solar Energy Research Institute of Singapore (SERIS) and spearheaded by the Singapore Economic Development Board (EDB) and PUB, Singapore's National Water Agency, as part of Singapore's green initiatives to assess the viability of using floating PV systems. Upsolar is one of eight other companies selected to install its solar panels that will eventually produce close to 100kW of electricity when connected to the national grid. Powered by Upsolar's UP-M320P which has one of the highest outputs in their product range, the system could allow 20 average households to completely run on green energy. The panels are mounted on a floating structure designed by Koine Multimedia, and the installation was conducted by CW Group in October 2016. The joint project will provide valuable insights into the cost, benefits and challenges of floating PV systems where SERIS will analyze the solar PV system, and PUB will study the effects on the surrounding water environment. "Upsolar is proud and excited to be part of a project that could open up new opportunities for floating PV," said Roy Li, Managing Director of APAC Region at Upsolar Group. "The land constraints in Singapore is a huge challenge for solar photovoltaic installations, but we are confident that floating PV can be the solution and would be very happy to be involved in future projects." Upsolar is a leading international developer and producer of high quality solar PV modules at competitive prices, ensuring secure long-term investments for our customers around the world. By utilizing a fabless, asset-light business model and top-tier module components, Upsolar is able to stay ahead of the demand curve and offer innovative, tailored PV technologies to meet customers' varying performance and aesthetic needs. For more information visit www.upsolar.com.
News Article | March 24, 2016
REC to ramp up Singapore output, collaborate on R&D with SERIS REC Solar has revealed plans to invest roughly S$200m ($145.9m) to expand production in Singapore, in addition to a commitment of S$50m to collaborate on PV module R&D with the Solar Energy Research Institute of Singapore (SERIS).
Wong J.,Solar Energy Research Institute of Singapore |
Green M.A.,University of New South Wales
Physical Review B - Condensed Matter and Materials Physics | Year: 2012
The electronic and optoelectronic reciprocity relations for solar cells in their differential forms are extended to account for series-resistance effects. They are expressed in terms of the terminal current and voltage at any device-operating point. Three new reciprocity relations are derived for the carrier collection efficiency density, current transport efficiency, and the current conversion efficiency, whose definition and use are discussed. The potential usefulness of these relations in electroluminescence imaging, spectral response measurements, and solar cell modeling is outlined. © 2012 American Physical Society.
News Article | April 18, 2016
REC Solar is switching all of its manufacturing/production capacity at its manufacturing plant in Tuas, Singapore, over to its half-cut PERC cell technology, according to recent reports. The company’s TwinPeak series of solar photovoltaic (PV) modules features the aforementioned technology. The production conversion will run around SG$200 million (~$182 million), and will be accompanied by SG$50 million (~$45 million) in new research and development funding to be utilized with the Singapore-based R&D center SERIS (Solar Energy Research Institute of Singapore) over the next half decade or so. This new research and development funding will be utilized primarily in the development of a new, novel 350 Watt (W) solar PV module over this half-decade period of time. REC Solar is reportedly expecting the new solar PV module design to generate up to 1.35 times the electricity as a comparably sized standard solar PV multi-crystalline module — while keeping costs comparable. This marks the first time that a major solar PV manufacturer has switched all of its production capacity to half-cut and PERC cell technologies. To provide some further background here, as we reported back in November, the Norwegian company is expecting its global module sales to climb roughly 10% in 2016 (as compared to 2015). The CEO of REC Solar, Steve O’Neil, commented at the time: “Continuously declining PV system costs are one of several key drivers for the industry. We are also expecting a strong agreement at the UN Climate Change conference, reflecting the ambitious targets on emissions and renewable energies set by around 150 countries worldwide in advance. This should further increase solar’s momentum, which we will continue to leverage. Besides expanding our module capacity to 1.7 GW by (the) end of 2016, we are exploring new business models and penetrating new emerging markets.” It’s also worth noting here that the company rose to become the third-largest solar PV supplier in the US residential market last year. Drive an electric car? Complete one of our short surveys for our next electric car report. Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
Peters I.M.,Solar Energy Research Institute of Singapore
Optics Express | Year: 2014
Fundamental limits for path lengths of light in isotropic absorbers are calculated. The method of calculation is based on accounting for occupied states in optical phase space. Light trapping techniques, such as scattering or diffraction, are represented by the way how the available states are occupied. One finding of the presented investigation is that the path length limit is independent of the light trapping mechanism and only depends on the conditions for light incidence to, and escape from the absorber. A further finding is that the maximum path length is obtained for every light trapping mechanisms which results in a complete filling of the available states in phase space. For stationary solar cells, the Yablonovitch limit of 4dn2, with n the refractive index of the absorber, is a very good approximation of this limit. © 2014 Optical Society of America.
Hameiri Z.,Solar Energy Research Institute of Singapore |
Chaturvedi P.,Solar Energy Research Institute of Singapore
Applied Physics Letters | Year: 2013
A contactless method to extract spatially resolved electrical parameters of silicon wafers and silicon solar cells is introduced. The method is based on photoluminescence imaging and can be applied throughout the solar cell fabrication process, even before junction formation. To validate the method, the parameters obtained by it are compared to the ones obtained by the well-established Suns-Voc measurement. Good agreement is obtained. © 2013 American Institute of Physics.
Chen F.,Solar Energy Research Institute of Singapore |
Wittkopf S.K.,Solar Energy Research Institute of Singapore
Energy and Buildings | Year: 2012
Calorimetric measurement systems are commonly used to determine the thermal transmittance or U-value of fenestration specimens, particularly for complex systems with additional external shadings, embedded photovoltaic cells or non-homogeneous patterns. In the past, measurements were mainly performed under winter conditions, where heating of buildings is required, but for tropical climates or summer conditions, where cooling of the building is required, very few thermal transmittance data are available, as most of the calorimetric systems were optimized for the winter conditions only. This paper presents a calorimetric hot box (CHB) for summer conditions complying with international standards, but with advanced measurement methodology and uncertainty analysis model. It includes the measurement results of double glazing units and comparison with simulation results obtained with WINDOW and THERM software. The comparison revealed a difference of less than 5% which can be considered negligible as it falls within the accepted uncertainty. Further results from measurements of complex fenestration systems with semi-transparent thin-film photovoltaics embedded into laminated and double glazing units are also presented. Hence, the presented system and method can pave the way for thermal performance validation of standard and complex fenestration systems necessary for energy efficient buildings in the tropics. © 2012 Elsevier B.V.
Wong J.,Solar Energy Research Institute of Singapore
IEEE Transactions on Electron Devices | Year: 2013
Recently proposed perturbation analysis and reciprocity relations in photovoltaic conversion are demonstrated in 2-D simulations. The main parameters discussed are the current-conversion efficiency, which enables accurate calculation of the sensitivity of maximum power to different recombination parameters, and its derived local series resistance, whose weighted average is exactly equal to the series resistance obtained by the double illumination method. Both parameters can be displayed as spatial maps to visually aid multidimensional computer simulations. Finally, the suitability of mapping the local series resistance from luminescence images is discussed with the help of simulated examples. The experimental and computational procedures to generate these maps are among the easiest proposed so far in the literature and require no ad hoc assumptions. © 1963-2012 IEEE.
Wong J.,Solar Energy Research Institute of Singapore
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2013
Solar cell designs with complex metallization geometries such as metal wrap through (MWT), interdigitated-back-contact (IBC) cells, and metal grids with non-ideal features like finger breaks, finger striations and non-uniform contact resistance, are not amenable to simple series resistance (Rs) analysis based on small unit cells. In order to accurately simulate these cells, we developed a program that captures the cell metallization geometry from rastered images/CAD files, and efficiently meshes the cell plane for finite element analysis, yielding standard data such as the I-V curve, voltage and Rs distribution. The program also features a powerful post processor that predicts the rate of change in efficiency with respect to incremental changes in the metallization pattern, opening up the possibility of intelligent computer aided design procedures. © 2013 IEEE.