Research On Maximum Power Point Tracking Technology Of Solar Photovoltaic Power Generation System

With the rapid development of human civilization and the continuous progress of society,fossil energy based traditional energy sources can no longer meet the growing needs of mankind.Vigorously developing and utilizing new energy is the effective way to protect the environment for human survival and achieve sustainable development.Solar energy is the direct use of solar energy for its rich resources,clean and renewable,non pollution and many other advantages.Therefore,solar PV maximum power point tracker can be added to PV panel battery and load to improve solar energy utilization.In this paper,the maximum power point tracking problem of photovoltaic panels is studied.This paper first analyzes the composition and basic types of solar photovoltaic power generation system,and the problems of grid connected photovoltaic system.The basic principle of photovoltaic cell and its characteristics are studied,and its mathematical model is set up to study the influence of the output voltage and current of the photovoltaic cell on the maximum power point of the photovoltaic cell under the conditions of the external environment.The three classical maximum power point tracking methods and principles,as well as fuzzy control,are studied and compared,and their advantages and disadvantages are obtained.Aiming at the problems of slow tracking speed,instability and low output power,a method combining fuzzy control with PID control is proposed.A fuzzy PID controller is designed,and the tracking performance of MPP under disturbance observation method,traditional fuzzy control method and fuzzy PID control method is compared and analyzed.The simulation results show that,when the environment conditions change,the disturbance observation method is complicated,and the tracking speed is slow and the stability is poor.From the simulation results of traditional fuzzy control,it can be seen that although the velocity of the disturbance observation method has a certain improvement,the waveform is not stable;based on the fuzzy PID control,it is not stable.When the external conditions change,the method of making is changed.Obviously,the tracking speed is faster than that of the first two,the system oscillation is small(the system is more stable),and the output power is larger.