Renewable Energy

At present mono crystalline silicon solar cells are more established and mostly used to generate electricity rather than using thin films crystalline silicon solar cells, amorphous silicon solar cells, because they attain less efficiency. Improvement in efficiency of mono crystalline silicon solar cells is very much relevant today from the point of view of cost reduction. Some of the very promising approaches for efficiency improvement for conventional silicon solar cells manufactured with screen printing technology are modification in the existing screen printing, Al BSF process, selective emitter, back surface passivation, HIT cells, multilayer Anti-reflection coating and other technologies etc. These technologies boost the efficiency of a solar cell by 1-2%. This paper discussed and investigated for improving efficiency in mono crystalline silicon solar cells with uniform texturization, multilayer ARC, front grid optimization, metallization and increasing aspect ratio which decreases shadow effect and also lowers the series resistance, in the manufacturing process of mono crystalline silicon solar cells.

Harmonic currents or voltages are generated from a non-linear load when it is connected to the mains supply. The problems caused by harmonic include overheating of cables, especially the neutral conductor, overheating and vibration in induction motors and increased losses in transformers. In this paper, the details analysis of harmonics effect on a 1KVA transformer is analyzed. A frequency oscillator source is used for generating the harmonics signal on the transformer. The total harmonic distortion, crest factor and K-factor are analyzed by using a Fluke-435 power analyzer.

The need to generate pollution free energy has triggered the effect towards the usage of wind energy interconnection with the grid. Thus, the wind power plants l interfaced with the grid causes the power quality problems such as a harmonics, voltage sag etc., Active power filters are the powerful tool for mitigation of harmonics. This proposed work describes the methodology for improving power quality of the grid system interfaced with renewable energy. The inverter used this methodology can also be used as a power converter for injecting power from RES to grid along with harmonic compensation. This concept is validated through dynamic simulation using MATLAB/Simulink Power system toolbox.