الفهرس 
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Abstract
The aim of this thesis , is to design a photovoltaic power system ( PVPS ) to be inter connected with the utility grid ( UG ) : focusing on the interface bet wean the PVPS and UG . This thesis consists of seven chapters . these chapters . these chapters can be summarized as follows :- Chapter one is an introduction about photovoltaic history , photovoltaic , basics , utility inter active systems and power conditioning omits ( PCU ). In chapter two , the PVPS has been designed into two steps , the first is estimation of the hourly radiation on the tilted surfaces from the hourly radiation incident on a horizontal surfaces. the second septic estimation of the optimum PVPS components chapter three has presented the mathematical model of solar cell equivalent circuits. Chapter four de scribes the design of the PCU for PVPS to be inter connected with the UG . molding of the inverter with different types of switching techniques has been discussed. In chapter five , a NN controller for maximum power point tracking which extracts maximum available solar power from PV arrays under variable conditions of radiation and temperature has been discussed. Chapter six presents a complete analysis for estimating the energy cost figure ( ECF ) and the reliability of the PVPS when using each type of the selected solar modules. Chapter seven includes both the final conclusions out line for this thesis and the future work.