Optimal Design of Solar Water Pumping Systems

This thesis presents a detailed study of photovoltaic water pumping systems. Each component in the system is studied separately and stands on its types and design approaches. After this through study of these parts, the best one from each of them is chosen to achieve a simple and efficient system. Then a complete modeling and simulation for the whole system is done using the commercial software MATLAB. The simulation is used to study the performance of photovoltaic pumping system uses PM DC motor and positive displacement pump, tmder different environmental conditions. Also, this thesis studies the effect of parasitic resistances and diode ideality factor on characterization parameters of photovoltaic modules. Which are bhelpful for module manufactures for improving the manufacturing process. Besides the system contains a control system to keep the module operates at its maximum power point (Maximum power point tracker MPPT) to improve the system efficiency and decrease its cost. Thesis presents a review for different algorithms used in the control system and a comparison between the performance analyses of them. As well as, thesis investigates the effect of changing cell temperature and solar irradiance on the choice and design of different topologies of DC-DC converter commonly used in photovoltaic systems. The study shows that, the buck-boost and the c’uk converter are capable of achieving the optimal operation regardless of the load value. And for a permanent operation in continuous conduction mode the filter inductance for all converter topologies must be greater than the maximum value of boundary inductance. Also in order to limit the ripple in the output voltage below a certain value, the filter capacitance must be larger than the maximum value of boundary capacitance.This study is applied on atmospheric conditions in EGYPT.