Design And Simulated Implementation For Maximum Power Point Tracking In Photovoltaic System

Nowadays, energy demand keeps growing. Industrialized countries still consume most of the energy. Because of rapid economic growth and population expansion, the consumption will also grow substantially in developing countries. The demand of non-renewable fossil fuels continues to rise, reflecting a sharp rise in the price. These problems forced people to change the energy structure, and look for new alternative energy sources. Since solar energy has many advantages such as economy and clean, technologies for its development and utilization have been developed rapidly. As such, photovoltaic power generation becomes an important area of research. Maximum power point tracking (MPPT) is the most effective way to solve the efficiency of solar cells.This thesis first introduces the features and application of photovoltaic power generation,explaines the research background and significance of the maximum power point tracking, and indicates that the MPPT technology is an effective way to improve the efficiency of photovoltaic cells. Then, this thesis analyzes the working principle of the photovoltaic cells and the equivalent circuit, presents the theoretical mathematical model of the photovoltaic cells, and transform them into engineering mathematical model. In the following, this thesis constructs a photovoltaic cell engineering simulation model, and uses the software of Matlab to do the simulation for receiving the output characteristic curves of photovoltaic cells. By analyzing the Boost hardware circuit and finding out the realization theory of MPPT, this thesis proposes the MPPT simulation model according to the engineering simulation model of the photovoltaic cells. After analyzing the advantage and disadvantage of MPPT of commonly used method of tracking (constant voltage method, the incremental conductance method, and the method of observation disturbance) the thesis improves the problems in disturbance observation and concludes that the real time occupies empties compared to adjust the algorithm.The algorithm is used in the simulation. and the results show that this algorithm can effectively increase the output power of photovoltaic cells and improve the system dynamic and steady-state performance as well. Finally, this thesie designs a preliminary hardware circuit for maximum power point tracking.