| Because of the increasingly serious energy crisis and environmental problems,people pay more attention to the use and development of solar energy.The desert area in northwest China has the advantages of sufficient illumination conditions,abundant solar energy resources and less shielding,so it is an advantageous area for the construction of large-scale photovoltaic power stations.However,this will also bring various problems,such as the deposition of a large amount of dust on the photovoltaic panels,resulting in the reduction of the photovoltaic cell’s power generation efficiency.Therefore,it is particularly important to analyze the influence degree and mechanism of atmospheric dust removal on photovoltaic panel power generation efficiency.However,most of the existing researches are outdoor experiments and only consider the influence of a single factor on the temperature of photovoltaic panels,while in the actual environment,a number of complex and uncontrollable factors simultaneously affect the photovoltaic panel generation efficiency.Therefore,in this paper,the influence of dust accumulation,wind speed,irradiance and other factors on the temperature of photovoltaic glass panel will be studied by using an indoor experimental platform,and the change of photovoltaic panel output characteristics will be studied through numerical simulation.The main research contents of this paper are as follows:Firstly,the influence of dust accumulation,wind speed and incident light irradiance on the temperature of photovoltaic glass panel was studied by using an indoor experimental platform.The results show that:(1)In the absence of wind speed,the temperature on the upper surface of the glass plate is higher than that on the lower surface,and the temperature on the dusty glass panel is significantly higher than that on the clean glass panel.(2)With the increase of wind speed,the glass panel temperature tends to be flatter and decreases exponentially.At the same time,the final temperature of the clean glass panel is close to the ambient temperature,while the dusty glass panel temperature is still higher than the ambient temperature.(3)With the increase of irradiation intensity,the temperature of the glass panel also increases,and the temperature of the dusty glass panel is higher than that of the clean glass panel.These experimental results show that dust accumulation has a warming effect on photovoltaic panels.The calculation results based on optical theory further show that dust accumulation has the effect of increasing the temperature of photovoltaic panels.Secondly,the influence of vitreous particles with different particle sizes and deposition masses on the temperature of photovoltaic glass panel was studied,and the irradiance of transmitted light was investigated when the particles were deposited on the surface of the glass panel.The results show that:(1)The glass panel temperature decreases with the increase of particle size,but increases with the increase of deposition mass.(2)The transmission irradiance of the glass panel increases with the increase of particle size and decreases with the increase of deposition mass,but it is far less than the incident irradiance.Finally,the real temperature prediction model of PV cell obtained by field data fitting was substituted into the PV cell simulation model,and the simulation system was built in MATLAB.The effects of incident light irradiance,ambient temperature,wind speed and dust glass panel transmittance on the output characteristics of photovoltaic cells were studied.The relevant results of this paper are of great significance to accurately understand the influence mechanism of atmospheric dust removal on photovoltaic power generation system in desertification environment. |
