Research On The Key Technology Of Independent Photovoltaic Power Generation System Based On Super Capacitor Energy Storage

As the global energy crisis,the greenhouse effect,environmental pollution,the development of renewable energy becomes a requirement as a way to solve such problems. As a typical renewable energy,solar energy has great development potentials due to its abundant, inexhaustible and no pollution to the environment. Solar photovoltaic power generation is the main use form.In this paper, the research focuses on independent photovoltaic power generation system based on super capacitor energy storage,and the comprehensive analysis on the system of various components is completed. The maximum power point tracking and super capacitor energy storage are studied.First of all, this paper introduces the composition and classification of photovoltaic power generation system,and the independent photovoltaic power generation system structure and key technology are proposed. Secondly, this paper introduces the working principle of the photovoltaic cells,and its modeling and simulation analysis are carried out. The basis study of photovoltaic battery MPPT control method is also developed in this paper. Meanwhile,this paper proposes a variable step disturbance observation method based on the principle of maximum power tracking and the resulting comparison of several common MPPT methods. Based on the Boost circuit,the MPPT control system is built,the simulation results show that the variable step perturbation algorithm has better effect in the tracking speed and accuracy.In the case of changing environmental conditions,the system exhibits good stability.Finally, this paper introduces the principle and advantage of the super capacitor energy storage,also,super capacitor equivalent circuit model is established.This research focus on the bidirectional DC/DC converter and the small signal mathematical model,and voltage outer ring current inner2-ring control method is proposed.The MATLAB simulation of the super capacitor energy storage system is used to verify the double loop control of the super capacitor charge and discharge with a validity and reliability.