Study Of Photovoltaic Panels’ Dust Accumulation Characteristics And Efficient Dust Removal Method

With the further development of economic globalization, the energy consumption is in accelerating growth, the competition of non-renewable energy resources is fierce. Gradually, the development of clean energy, such as photovoltaic(PV), is attracting more and more attentions. To improve the performance of PV system, many efforts have been contributed to the installation optimization, system performance optimization and new photoelectric material development, etc. However, few studies considered the influence of the properties of PV module itself on dust deposition and efficiency degradation, the deposite may decrease the transmittance of solar cell glazing and cause a significant degradation of solar conversion efficiency of PV modules, which results in additional costs from normal performance.The PV panels under consideration are selected from the 20-kW PV power plant installed on the rooftop of urban building in Hangzhou. This experimental work aimed to test the photovoltaic panels’ output power reducing values due to the dust accumulated on their surfaces, and revealed the necessity to clean photovoltaic panels’ dust. This thesis analyzed the dust’s removal principle, designed the dust removal mechanism, and verified the theoretical work with simulation and experiments. The main research contents are as follows:1 The dust settlement and accumulation on the surface of photovoltaic panels in the urban environment was analized.2 The power generation under the the effect of dust accumulation was investigated. The reductions of power output as Percentage power reduction were recorded, compared and established the power generation effiency with respect to the factor of dust accumulation.According to the technical indicators, conversion efficiency and economic factors to implement a suitable cleaning system. Consequently, it shows the optimal cleaning interval time is 6 days.3 The physical properties of dust accumulation ware analyzed. Using the dust reaction equation, the trajectory of discrete phase were solve, which then was adopted to discuss the speed of dust.4 A special suction structure was designed to implement a suitable cleaning system. The suction mouth and bend pipe components were simulated, using the Lagrangian discrete phase method to demonstrate the curve of velocity distribution, pressure distribution and particles of different size of dust. Then, the optimal pressure in the suction mouth was given.5 The dust removal setup for cleaning the PV surface was design. With the fixed right pressure, the wind velocities at different measuring point in suction mouth were recorded. The experimental results verified the theoretical work.