Application Research Of Improved Power Prediction Variable Step Perturbation Observation Method In MPPT Of Photovoltaic System

Countries around the world have carried out excessive exploitation and consumption of chemical fossil fuels,which has made energy and environmental pollution problems increasingly serious.Therefore,renewable energy has been proposed and widely used.Among them,solar energy is one of the most widely used renewable energy sources,which has received a lot of attention.This thesis mainly has some improvements in the shortcomings of solar MPPT technology,and finally verify the simulation verification,the improved part is mainly proposed for the MPPT algorithm to improve the translometing long disturbance observation method for improved power prediction,and the theory is verified by simulation,and then the improved MPPT algorithm is tested to verify the effectiveness of the research content in this thesis.First of all,this thesis studies and analyzes the background and significance of related topics in detail,and analyzes and elaborates the main research content and the current research status at home and abroad such as photovoltaic power generation MPPT control.Next,the working principle of solar power generation is analyzed and the mathematical model of photovoltaic cells is established through the results of the analysis,and its feasibility can be verified by simulation.After that,the main focus of the analysis is on various DC/DC conversion circuits,and the working principle and topology are studied in detail.A detailed analysis is performed for the MPPT commonly used transform circuit,the Buck-Boost circuit can achieve the maximum power point tracking of photovoltaic MPPT,which can provide a basis for the next step.Secondly,a detailed analysis and study of the maximum power tracking control method in solar energy,and its principle and commonly used control methods were studied and compared.Then,according to the problem of the existing method,an MPPT algorithm for improved power prediction will be improved,and the simulation research mainly studies two aspects that duty cycle,output voltage,according to the analysis verification for these aspects.The effectiveness of improved algorithms.Finally,experimental analysis of the MPPT overall controller,first designed for the controller,where the main control chip uses the model STMS32G474.The design of the MPPT controller includes hardware and software parts,and the two parts are designed separately,and then experimentally verified the improved MPPT algorithm that this article should be proposed.The thesis has 50 figures,2 tables and 60 references.