Concentration Photo-Voltaic Rotating Mechanism with Commutation Inverter Amr Elzawawy Abdelrahman Farghly Tarek Negm Abdelrahman Zitoon Abdelrahman Ismael amr.elzawawy @yahoo.com eng_abdelrahman.farghly @yahoo.com tareknegm4eng @yahoo.com abdelrahman_Zitoon @yahoo.com abdelrahmanismail2010 @gmail.com Department of Electrical Engineering University of Alexandria Alexandria, Egypt Abstract – Photo-Voltaic (PV) power generation is one of the smart choices for efficient utilization of solar energy. Considering that the efficiency and cost of PV cells cannot be significantly improved, a relatively cheap concentrator replaces part of the expensive solar cells that can be used. We use a new method in solar energy that concentrates the light in Photo-Voltaic and increases the efficiency and decreases the cost. Moreover the system can be used to convert DC power from solar cells to AC by commutation without any electronic component. Index Terms – commutation, concentration, spin PV. I. INTRODUCTION Solar power is one of the most accessible forms of available renewable energy, and it can be adapted to fit anyone’s specific needs. The source of it i.e. sunlight, allows Photo-Voltaic (PV) modules to produce electricity and perform useful work, such as running electrical loads or getting energy back into the utility grid. Photovoltaic systems comprise photovoltaic cells which convert sunlight into electricity. Inside each cell there are layers of a semi-conducting material. Light falling on the cell creates an electric field across the layers, causing electricity to flow. The intensity of the light determines the amount of electrical power each cell can generate. Most solar cells are produced from silicon, which is non‐toxic and is found in abundance in the earth's crust. Typical photovoltaic cell efficiency is about 15%, which means it can convert 1/6 of solar energy into electricity.[1] Converting solar energy into electrical energy by PV installations is the most recognized way to use solar energy [2]. Solar energy is the richest renewable energy on Earth. It is pollutant-free, widely scattered, and inexhaustible. However, there are drawbacks such as low density, dispersed, unstable, and discontinuous charactrictics. Currently methods for solar energy conversion mainly include solar hydrogen production, solar thermal power generation, and PV power generation. Compared with solar thermal power generation, PV power generation can realize direct photoelectrical conversion, leaving out the intermediate energy conversion step. Thus, its generating efficiency is not restrained by the Carnot efficiency. Moreover, because of its less demand for solar radiation intensity, PV power generation has more extensive applicability and is the best choice for the distributed energy Supply, such as in a small-scale households [3]. Two urgent problems need to be addressed in solar PV application, that is, the high cost of PV power generation and the relatively low photoelectric conversion efficiency. Currently, the industrial production of crystalline silicon solar cell conversion efficiency is approximately 16% to 17%, the highest being only about 22%. II. CONCENTRATION Concentrating photovoltaic systems (CPV) utilize low cost optical elements such as Fresnel lens or mini- reflecting mirrors to concentrate the solar intensity from 200 to 1000 suns.[4] Increasing efficiency to more than 30% is the major advantage for CPV system, besides, low material consumption and small space for the design are also good characteristics of CPV.[5] A portion of the energy is converted to electricity, while the remaining must be removed as waste heat. Solar cell cooling system must be an integrated part of the CPV design. III. CONSTRUCTION OF SETUP The proposed design has a new feature, that is rotation mechanism carrying solar cells. Amorphous Silicon sized 37 X 22 mm cells (Fig.1) are used with 6.0V as open circuit voltage per cell and 5 mA as short citcuit per cell.