| With the transformation of the world from an industrialized society to a low-carbon society,solar energy has been widely used in various field due to its characteristics of wide distribution,clean and renewable.How to utilize solar energy efficiently has always been a hot research topic for scholars.As one of the key technologies to improve solar energy utilization,maximum power point tracking(MPPT)technology has become an important issue in the research of photovoltaic industry.In order to improve the overall conversion efficiency of photovoltaic power generation system,this paper introduces a distributed MPPT photovoltaic system,and analyzes the structure and working principle of the system.According to the structure characteristics of the system,a DC / DC converter is selected as the main circuit topology of the system to achieve maximum power point tracking,which introduces the main research work of this subject.This paper will focus on the following aspects:Firstly,the research background,significance and research status of solar power generation are introduced.Based on the introduction of photovoltaic modules and their output characteristics,the principle of MPPT and the advantages and disadvantages of several common MPPT methods are analyzed.In view of these advantages and disadvantages,a new MPPT control strategy is proposed in this paper.Secondly,the overall control block diagram of the system,the working principle of the main circuit topology,the soft switch strategy realization scheme,device selection and parameter calculation are introduced in detail.The circuit schematic diagram and the design principle of the control circuit are given as well.Then the new MPPT control strategy is analyzed and introduced.The closed-loop regulator is designed according to the closed-loop structure and its mathematical model of the system.On the basis of theoretical analysis,the system is realized digitally,and the main function of each function module is briefly described through the program flow chart.Finally,the simulation and experimental verification of the system are carried out.According to the theoretical analysis and research of the system design scheme,the simulation model is built under the platform of MATLAB-Simulink,and the simulation is carried out.The experimental research is carried out on the hardware platform of the DC/DC converter,and the main circuit topology and MPPT control strategy proposed in this paper are verified by experiments.The correctness of this theoretical analysis and the feasibility of the scheme are fully verified via the simulation research and experimental results. |
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