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Chopde A.,Vishwakarma Institute of Technology | Chopde A.,Indian Institute of Technology Bombay | Magare D.,Indian Institute of Technology Bombay | Patil M.,Indian Institute of Technology Bombay | And 2 more authors.
Applied Thermal Engineering

A dynamic thermal model for a photovoltaic (PV) module has been developed, considering all possible mechanisms of heat transfer between the module and its environment. The particle swarm optimisation (PSO) technique is applied for extraction of model parameters from experimental data. The model is then used to predict the PV module temperature variation with time on different days of the year. It is shown that the predicted temperature tracks the experimentally measured temperature very closely for a variety of atmospheric conditions at the location of installation. © 2016 Elsevier Ltd. All rights reserved. Source

Chakraborty S.,Indian School of Mines | Kumar R.,National Institute of Solar Energy
World Journal of Engineering

The power output of Photo-voltaic modules is generally rated at STC (Standard Test Condition), 1000W/m2 irradiance, 25oC temperature and 1.5G Air Mass. But in actual field condition the situation is different from STC. Output of PV module is a function of Irradiance, ambient temperature, wind speed and module temperature. It is well established that power output of PV module decreases with increase of module temperature. So it is important to know the temperature of PV module to determine the reduction in power output due to temperature. Module temperature can be determined if irradiance at that instant and NOCT value of that module is known. This work presents the variation in NOCT value with respect to rated power output of PV module and comparison of NOCT values for same rated power mono and multi crystalline Si modules from various manufacturers. According to this study NOCT value increases with the wattage of PV module. For same rated power modules, NOCT value of mono crystalline Si is more than multi crystalline Si. Source

Nikhil P.G.,National Institute of Solar Energy | Subhakar D.,Vellore Institute of Technology
2015 International Conference on Control, Communication and Computing India, ICCC 2015

A simulation algorithm to estimate the total energy generated from a grid connected PV facility at any given location and for a given capacity is developed. The proposed simulation model combines the analytical methods with long term performance at hourly interval, and there by evaluating the optimum distribution units based on the cost function. The goodness of the simulation is validated using cumulative generation data from a 2 MW PV power plant. The novelty of the approach is established by sorting out the best commercial PV modules available in the market based on maximum electricity units generated per unit area, with reference to their name plate specifications. Further, the application of the simulation algorithm is demonstrated by evaluating the sizing requirement of a 1 MW scale grid connected PV power facility for Vellore district of Tamilnadu. The simulation algorithm also attempts to explore the effect of Nominal operating Cell Temperature (NOCT) on the plant capacity factor. Conclusions of this paper are good references for the sizing of grid connected roof top PV power plants, as well as to decisively choose the module specifications. © 2015 IEEE. Source

Priya S.S.,Karunya University | Sastry O.S.,National Institute of Solar Energy | Bora B.,National Institute of Solar Energy | Kumar A.,Tezpur University
2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015

The performance of PV module is compared through measuring I-V characteristics at STC. But usually in the real outdoors the PV module behaves differently. To estimate the power and energy rating under different climatic conditions, I-V curves are extrapolated by applying corrections. In this paper we have examined I-V curve's correction procedure as per IEC 60891 for different temperature and irradiance conditions of three thin film PV technologies viz. CIGS, CdTe, Micro-morph, and a comparison is made with measured data in real outdoor conditions. Deviations from estimated and measured output for three different correction procedures are compared. The correction procedure 3 gives the best results as compared to procedure 1 & procedure 2. © 2015 IEEE. Source

Rajput P.,Indian Institute of Technology Delhi | Tiwari G.N.,Indian Institute of Technology Delhi | Bora B.,National Institute of Solar Energy | Sastry O.S.,National Institute of Solar Energy
2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015

This paper presents the analysis of visual and electrical degradation of 22 years field aged mono crystalline silicon PV module in composite climate of India. The visual degradation data is correlated with the electrical performance degradation data. Average power degradation rate for the studied PV module is more than 1% per year. The discoloration of back-sheet, bus-bar, cell inter connect ribbon, string interconnect ribbon and solar cell are found to be obvious in all the modules, however the percentage of defects are different. © 2015 IEEE. Source

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