Abstract
Concentrator photovoltaic modules are a promising technology for highly efficient solar energy conversion. This system presents several advantages due to additional degrees of freedom that has been provided by the spectral separation such as cost and mass reduction, increase in the incident solar flux on PV cells and performances. This paper has proposed a unique photovoltaic solar cell system that consists of semi-Fresnel lens convergent structure and a novel two axis sun tracking module to enhance the efficiency of solar cell by using less cell area and energy losses. The grooves of this lens are calculated according to the refraction and convergent angles of the light easy for perpendicular incidence angle. The update time interval during tracking causes misalignment of the lens’ optical axis versus the sunrays. Then an inventive sun-tracking method is introduced to adjust the module so that the incident rays are always perpendicular to the module’s surface. As a result, all rays will be refracted with the predetermined angles. This way the focus area is reduced and smaller cells can be used. We also mentioned different module connections in order to provide compensation method during losses, for networks and power systems. Experimental results show that using semi-Fresnel lens, along with the sun-tracking method increases the efficiency of PV panel.
Highlights
PV concentrator systems reduce the area of photovoltaic cells required, increase the solar radiation intensity on the photovoltaic cells and can lead to a reduction in total system cost, if the costs of the concentrator and tracking assembly are less than that of the area of photovoltaic cells displaced. they are mainly composed of silicon, which is a widespread material in nature, the process and the final product is expensive
This paper has proposed a unique photovoltaic solar cell system that consists of semi-Fresnel lens convergent structure and a novel two axis sun tracking module to enhance the efficiency of solar cell by using less cell area and energy losses
Experimental results show that using semi-Fresnel lens, along with the sun-tracking method increases the efficiency of PV panel
Summary
PV concentrator systems reduce the area of photovoltaic cells required, increase the solar radiation intensity on the photovoltaic cells and can lead to a reduction in total system cost, if the costs of the concentrator and tracking assembly are less than that of the area of photovoltaic cells displaced. Using a Fresnel lens and with the help of progresses in semiconductors, each wavelength can be concentrated on a different material to be absorbed effectively This will increase the solar system’s efficiency. The proposed model works by calculating the groove angles of Fresnel lens based on the refraction and convergent angles of the orthogonal incident ray. To provide this situation in practice, we suggest a sun-tracking method which tracks the sun and adjusts the module so that the incidence angle is always 90 degrees This way, all incoming rays are concentrated to a line resulting in producing a 2-cm light strip. This will reduce the needed solar cell area resulting in lower cost and lower loss of energy. Test results show that the designed model effectively increases the efficiency of the PV system, reducing its cost and loss of energy [7]
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