Outdoor Monitoring – India SEC Dhiraj Magare

Aim: Modeling the effects of environmental parameters on photovoltaic (PV) module performance

To analyze the PV module performance one can study the effect of seasonal variation on three different PV technologies (i.e. a-Si (amorphous silicon), HIT (Hetero-junction with Intrinsic Thin layer) and mc-Si (multi crystalline silicon)) installed at National Institute of Solar Energy (NISE), Gurgaon shown in Fig. 1. The study has been quantified using performance indices i.e. useful fraction (UF), average photon energy (APE), mis-match factor (MMF) and performance ratio (PR).

Figure1

Figure 1: Photograph of the PV module outdoor test bed.

Seasonal variations in APE, UF and MMF parameters showed that a-Si modules are more affected by seasonal spectral variations compared to other two PV technologies modules shown in Fig. 2. This study is useful to understand relative performance of specific PV technology which will dominate in a particular season.

Figure 2: APE variation with UF, and MMF variation of a-Si, HIT and mc-Si PV technologies for year 2010.

Figure 2: APE variation with UF, and MMF variation of a-Si, HIT and mc-Si PV technologies for year 2010.

The present site specific thermal model, considering module temperature and module efficiency and other environmental parameters such as; ambient temperature, irradiance, wind speed and direction. The validation of the model has been done by predicting module temperature of installed PV modules at NISE. The RMSE has been varying in the range from 5.22 to 6.04 (refer Fig. 3).

Figure 3: Percentage (%) of error in site specific thermal model of wind direction parallel to PV module surface for a-Si, HIT and mc-Si PV technologies.

Figure 3: Percentage (%) of error in site specific thermal model of wind direction parallel to PV module surface for a-Si, HIT and mc-Si PV technologies.

Contact for further information: Dr. Rajesh Gupta: rajeshgupta@iitb.ac.in; Dr. O.S. Sastry: sastry284@yahoo.in ; Dhiraj Magare: dhiraj.magare@iitb.ac.in