Research On The Mechanism Of Mutual Feeding Between Desert Wind-Sand Movement And Solar Power Generation Technology

Under the background that countries around the world are actively adjusting their energy structure in response to the global energy crisis,in view of the growing development status of desert photovoltaic power plants,the following two aspects of research content are proposed.First,the large-scale establishment of solar photovoltaic power stations in desert areas has a differentiation mechanism for local desert wind-sand movement.Second,photovoltaic modules are erected in the form of arrays and run in a sandy desert environment.When the wind-sand move across the photovoltaic array,the impact on the output performance of the modules at different relative positions is different.This is to discuss the interaction mechanism between the desert climate characteristic product—wind-sand movement and the output performance of each component of the photovoltaic array when photovoltaic power plants are built on a large scale in the desert area.The above-mentioned problems are studied by three research methods: field measurement,numerical simulation and wind tunnel test.(1)Taking the internal wind speed change law of a photovoltaic power station in Kubuqi desert as the test object,the changes of wind speed at three characteristic heights of the photovoltaic array with the two main directions of the array expansion in different monitoring ranges were measured and analyzed.The results show that the laying of photovoltaic arrays has a significant impact on the wind speed near the ground,especially reflected in the upward air movement of the photovoltaic modules in the north-south direction.(2)Based on the field measurement results,a numerical simulation analysis was performed on the distribution of the wind-sand two-phase flow inside the photovoltaic array with the incoming flow direction from the north to the south of the photovoltaic array.Through the analysis of the flow field distribution on the cross section of the relative position between the interior of the photovoltaic array and the non-disturbed area under constant wind-sand movement conditions,the differentiation effect of the laying of the photovoltaic array on the near-surface wind-sand movement in the desert is explored.The results show that the shape resistance generated at the edge of the air flow through the photovoltaic module affects the fluid motion state,resulting in a large difference in the flow field distribution between the center symmetry plane of the module and the edge section.(3)Five photovoltaic array models that increase row by row are established to compare and analyze the influence of the vertical expansion of photovoltaic modules on the movement of wind-sand.The results show that with the expansion of the longitudinal arrangement of the photovoltaic array,the maximum value of the negative pressure zone gradually shifts from the position of the street near the ground to the top of the photovoltaic module.The maximum velocity of the basin has a tendency to gradually decrease,and the coverage and extension of the low-velocity zone and the return zone gradually increase.The distribution of sand-dust on the ground has a tendency to gather towards the center.The densest distribution of sand-dust on the surface of photovoltaic modules occurs in the first row of the array,and the sparsest distribution occurs in the adjacent sub-row modules.(4)A wind tunnel test experiment was carried out on the output loss rate of photovoltaic modules before and after wind-sand crossing the photovoltaic array,and the accumulation of dust on the ground was observed to explore the effect of the vertical expansion of the photovoltaic array on the migration of sand-dust and the impact on its own output performance.The results show that the action mechanism of wind-sand movement on the modules is different from that of natural sedimentation and other forms of dust accumulation,and the output power of each row of photovoltaic modules after the wind-sand movement in the environment has different degrees of attenuation.Through the above research,the two-way impact of the large-scale establishment of photovoltaic power stations in desert areas on photovoltaic power output and desertification control in desert areas is analyzed.Exploring the mechanism of action between the two will provide a reference for the further development of desert photovoltaic power stations and the promotion of the organic combination of photovoltaic power stations and the desert environment.