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Research On Multi-peak MPPT Algorithm And Inverter For Photovoltaic System

Posted on:2018-10-03Degree:MasterType:Thesis
Country:ChinaCandidate:R Y DangFull Text:PDF
GTID:2322330536488033Subject:Engineering
Abstract/Summary:PDF Full Text Request
With economic development and population growth,fossil energy further depleted,energy crisis has become an increasingly concerned issue,and solar energy has become the world recognized as an ideal alternative energy.The use of solar energy resources is a worldwide problem,for the high population density of China is related to national sustainable development issues.High efficiency and high reliability of photovoltaic power generation is an important utilization and key technology of clean energy.This paper focuses on the maximum power tracking in photovoltaic power generation system,and analyzes the photovoltaic cell model,output characteristics,and maximum power tracking algorithm and two-stage off-grid PV inverter.Firstly,the principle and mathematical model of photovoltaic cells are analyzed,the simulation model is established on the basis of mathematical model.The influence of light intensity and ambient temperature on the output characteristics of PV cells and the effect of nonuniform illumination on PV series and parallel branches are discussed.This paper analyzes the maximum power tracking algorithm applicable to single-peak and multi-peak output characteristics.On the basis of summarizing the advantages and disadvantages of various algorithms,a multi-interval maximum power tracking algorithm is proposed.The dual-input five-level dual-buck inverter was selected for PV inverter,and its operating mode and modulation strategy were analyzed.In this paper,the voltage stress and power loss of the power conversion device are analyzed in detail.The new PV conversion platform is characterized by high reliability and high efficiency.The control strategies of the two converters in the platform are optimized and the system simulation is carried out to verify the effectiveness of the proposed method.At last,a prototype of 1kW is designed and developed.The prototype is controlled by DSP TMS320F28335.And achieve a stable output of 115 V / 400 Hz ac power.The experimental results show that the proposed control method is correct and feasible,and improves the conversion efficiency of PV conversion platform.
Keywords/Search Tags:photovoltaic power generation, photovoltaic array, partial shade, maximum power point tracking, multi-level inverter
PDF Full Text Request
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