Muhammad Rehan Afzal2025-12-182025-12-182019https://escholar.umt.edu.pk/handle/123456789/16839The Concentrated Photovoltaic (CPV) systems are typically based on the Fresnel lens, refractive Secondary Optical Elements (SOEs), and Multi Junction Solar Cells (MJSCs). The CPV System is an excellent approach to minimize the cost of Photovoltaic (PV) technology. In this work, a detailed optical modeling is applied to analyze the performance of four Fresnel lens based CPV systems equipped with different SOEs while considering the sub cells current density generation. This modeling allows to establishing the sub cell current limitation and the Spectral Matching Ratio (SMR), values in each case. The following refractive SOEs have been used for simulating the CPV units: (i) Refractive Truncated Pyramid (RTP) (ii) Dielectric Cross Compound Parabolic Concentrator (DCCPC), (iii) Trumpet and (iv) Spherical Domed. The SOE is used in CPV Systems with Fresnel lens to increase the optical efficiency by catching refracted sun light which missed by the receiver, better the tracking tolerance (acceptance angle) and enhance the flux uniformity on the MJSC. Four different SOEs are designed, analyzed and compared under same Fresnel lens based on their optical performances and manufacturing cost. Keywords: Solar Energy, Photovoltaic, Concentrated Photovoltaic System, Solar Concentrators, Solar Tracking System.enThesis