Modeling And Output Optimization Of Solar Arrays

With the development of technology,energy consumption is gradually increasing and Energy issues have become a global issue.Solar energy has made outstanding contributions to the development of new energy,and has been widely applied and promoted.Solar energy encounters many problems during its use,such as solar manufacturing process problems,shadow shading problems,and power optimization problems.This paper studies and analyzes solar array modeling,large array shadow shading experiments,and DC-DC power optimizers.In this paper,the current common PV model is researched and analyzed.The structure and principle of the PV model are studied in depth.The deficiencies of the current model are improved and a new PV model-segment linearization macro model is established.In order to verify the availability,correctness,and accuracy of the macro model,a simulation experiment was performed between the macro model and the single tube model in the PSIM simulation software.In order to further reflect the advantages of the macro model,a series-parallel photovoltaic array simulation model is established in the paper.The simulation time proves that the macro model can reduce the calculation amount,shorten the simulation time and improve the work efficiency.The paper selects three typical array topologies for shading experiments.The shading mode is divided into two modes:horizontal shading and vertical shading.The two modes are simulated in PSIM software.The simulation circuit consists of 1296 PV modules.Comparing the simulation data of the three topologies in the two modes,it is found that the shadow mode has an influence on the photovoltaic output,and it also proves that the array topology has a certain influence on the power output.The shadow mode affects the power output.In order to improve the output power,the four-switch Buck-Boost topology is selected as the research object,and the power optimizer is designed.In the relevant chapters,the paper analyzes the working principle of the optimizer,control strategy,and performs small signal modeling and loop compensation.The power optimizer has two duty cycles,and the control mode is flexible.Due to the problem of dual-loop control duty cycle conflict,the paper selects a single control loop dual duty cycle mode.Finally,the paper analyzes the hardware design,builds the experimental platform,and tests the power output of the PV array with maximum power point,which verifies the feasibility of the paper.