Research On Static Reconstruction Method Based On TCT Structure Photovoltaic Array

Energy is the basic driving force for human society and economic development.Among many renewable energies,photovoltaic is one of the most promising renewable energies.However,partial shadows pose a huge challenge to the stability and efficiency of photovoltaic power generation systems.The reconstruction of the photovoltaic array can balance the distribution of the shaded photovoltaic modules in the entire array,increase the average output power of the photovoltaic array,and effectively alleviate the impact of the hot spot effect on the photovoltaic array.In order to further reduce losses and increase output power,the photovoltaic array can be reconstructed.A dynamic reconstruction method is fast and flexible,but it has disadvantages such as complex hardware circuit and high cost,which restricts its application in practical engineering.Therefore,a static reconstruction method has more research significance.This paper studies the static reconstruction method of the TCT(Total Cross Tied)structure photovoltaic array,and proposes the ICL(Interpolation&Column Loop)static reconstruction method.The research content includes the following parts:First,the mathematical model of PV module is established,and the influence of irradiance and temperature on the output characteristics of PV module is analyzed.By adjusting the light irradiance to simulate different partial shadow shading situations,the reasons for the multi-peak effect caused by partial shadows are summarized,which lays the foundation for the reconstruction of photovoltaic arrays under partial shadow conditions.Secondly,under typical partial shadow conditions,the four-structure photovoltaic arrays of SP(Series&Parallel),TCT,BL(Bridge-Linked)and HC(Honey Comb)are simulated to obtain their output characteristics and analyze the structure of different arrays.Therefore,it is determined that the TCT structure is the most suitable photovoltaic array structure for reconstruction under partial shadow conditions.Based on the existing Zig-Zag zigzag and OEC(Odd Even Configuration)two static reconstruction methods,Combining the advantages of the two methods,a new ICL static reconstruction method is proposed.Finally,the proposed ICL static reconstruction method is verified through three aspects:theoretical verification,simulation analysis and actual experiment.The results show that the ICL static reconstruction method proposed in this paper improves the matching degree between the rows of the TCT structure photovoltaic array by changing the physical position of the photovoltaic module in the array,so that the average output power of the photovoltaic array after the reconstruction is improved,reduce the number of peaks of its output characteristics,which proves the superiority and feasibility of the ICL reconstruction algorithm.Moreover,this method has the advantages of simple principle,easy implementation,low cost,etc.,which can provide a good reference for the selection of array structure and reconstruction method during the construction of solar photovoltaic power plants.