Research On MPPT Of Photovoltaic Power Generation System Based On Fuzzy Control

In today's society,environmental pollution and energy scarcity have been plaguing humanity.In order to eliminate the contradiction between economic development and environmental pollution,new energy sources must be studied to ease the current energy and environmental crisis.Solar energy is a clean and renewable energy source.People have invested a lot of energy in researching and developing solar energy.With continuous exploration and development of photovoltaic power generation,the photovoltaic power generation industry has also achieved good results.However,there are many difficulties in the research process of photovoltaic power generation.Problems such as low solar energy conversion efficiency and photovoltaic cell output easily affected by external factors still need to be solved.The photovoltaic power generation system MPPT technology is an important means to improve the efficiency of the photovoltaic system.This thesis first elaborates the research background and significance of the topic,and discuss the photovoltaic power generation system,including its working principle and classification.The principle of the photovoltaic cell is described,and a simulation model of the photovoltaic cell is constructed.The output curve of the simulation is analyzed and the influence of temperature and light intensity changes on the output of the photovoltaic cell is explored.Secondly,after studying the BUCK circuit and the BOOST circuit and understanding the characteristics of the photovoltaic system,choose the BOOST circuit as the main loop of the photovoltaic MPPT system.Some common MPPT methods for photovoltaic power generation systems are described,and the advantages and disadvantages of MPPT methods such as perturbation observation(P&O),constant voltage method,and conductance increment method are analyzed.Finally,MPPT technology as an important means to achieve the MPPT of photovoltaic systems,under the premise of the analysis of common MPPT control methods.Aiming at the shortcomings of the P&O method in tracking the maximum power point of photovoltaic power generation,an improved method was proposed,namely,photovoltaic power generation system MPPT based on fuzzy disturbance control,and an improved MPPT simulation model of photovoltaic system wasdesigned.Different MPPT technologies have different effects on the efficiency of the photovoltaic system.In Matlab/Simulink,the P&O method and the fuzzy perturbation-controlled photovoltaic power generation system MPPT are compared and analyzed.The results show that when the environmental parameters(temperature and light intensity)of the photovoltaic power generation MPPT system based on fuzzy disturbance control change,the response time of the improved system after tracking the maximum power of the photovoltaic power generation system is about 0.13 s,which is more than that based on the disturbance observation method.The response time of photovoltaic power generation MPPT system is reduced by half,and the fluctuation is smaller and the stability is better,thus verifying the superiority and feasibility of this algorithm.The improved MPPT method enables the system to track the maximum power of the photovoltaic system faster and more steadily,which is conducive to improving the efficiency of photovoltaic power generation.