Informatics Publishing Limited

S. S. Hasan ¹, D. Banerjee ¹, B. Ravindra ¹, K. Sankarasubramanian ¹, K. E. Rangarajan ¹

Affiliations
1 Indian Institute of Astrophysics, Bengaluru 560 034, IN

Abstract

The National Large Solar Telescope (NLST) aims primarily to carry out observations of the solar atmosphere with high spatial, spectral and temporal resolution. A comprehensive site characterization programme, that commenced in 2007, has identified an excellent site in the Ladakh region at the Pangong lake, India. With an innovative optical design, NLST is an on-axis Gregorian telescope with a low number of optical elements to reduce the number of reflections and yield a high throughput with low polarization. In addition, it uses high-order adaptive optics to produce close to diffraction limited performance. To control atmospheric and thermal perturbations of the observations, the telescope will function with a fully open dome, to achieve its full potential atop a 25 m tower. The post-focus instruments include broadband and tuneable Fabry-Perot narrow band imaging instruments and a high-resolution spectropolarimeter.

Keywords

Adaptive Optics, High Angular Resolution, Magnetic Fields, Solar Telescope.

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Vikas Pratap Singh ¹, Vivek Vijay ¹, B. Ravindra ¹, D. K. Chaturvedi ², Rajashekhar P. Mandi ³

Affiliations
1 Indian Institute of Technology Jodhpur, Old Residency Road, Jodhpur - 342 011, Rajathan, IN
2 Dayalbagh Educational Institute, Dayalbagh, Agra – 282005, Uttar Predesh, IN
3 Central Power Research Institute, Bangalore - 560 080, IN

Abstract

The main objective of this paper is to review the state of the art of IIT Jodhpur Rooftop installed 110 kW PV systems. This is done analyzing the operational data of 110 kW PV systems (43.30 kW located in Block 1 and 58.08 kW in Block 2). Performance analysis depends on three basic term of solar PV. How much energy do they produce? What level of performance is associated to their production? Which are the key parameters that most influence their quality? During the year 2011, the PV systems in Jodhpur, India have produced a mean annual energy of 1290.64 kWh/kWp in block-1 and 1290.64 kWh/kWp in Block-2. As a whole, the location of Solar PV system is the main reason of energy variability and system output. The overall mean Performance Ratio is 75% in both Blocks. Solar power variability depends on the two variables, deterministic and stochastic variable. In last few years researcher work on finding deterministic variable such as system losses (module efficiency, DC cable losses, inverter losses and AC cable losses) but these deterministic variables are not enough to give accurate forecasting so with the help of combined effect of these both variable give accurate plant performance and reliable solar power forecasting for solar power scheduling and dispatchability.

Keywords

PV System description, Roof of academic blocks, Performance analysis of solar PV, Performance ratio, Deterministic variables and Stochastic variables

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