Views:352 Author:Site Editor Publish Time: 2021-08-17 Origin:Site
Energy and environmental issues have become one of the focuses of global attention. Compared with traditional petrochemical energy, solar energy has become one of the main forms of new energy with the advantages of inexhaustible, clean and pollution-free. The two main forms of solar power generation are photovoltaic power generation and thermal power generation. In the research of solar photovoltaic power generation system, in addition to the key technologies such as panel material and conversion efficiency, inverter efficiency, maximum power point tracking and off-grid control, panel dust accumulation is also a problem that cannot be ignored.
The accumulation of dust on the photovoltaic panel will reduce the transmittance of solar radiation, resulting in a decrease in the output power of the photovoltaic panel. In addition, because the dust absorbs solar radiation to heat up and has corrosive chemical components, dust accumulation will also form a certain degree of heat preservation and corrosion on the photovoltaic panel, which will aggravate the reduction of its photoelectric conversion efficiency. In order to alleviate this problem, this article will analyze the influencing factors of panel dust accumulation and a new solar panel cleaning technology, and finally put forward opinions and suggestions on future research directions.
The main source of dust in solar PV panels is atmospheric dust. It is a kind of suspended particles in the atmosphere, which comes from the surface particles produced by atmospheric deposition, urban traffic, construction, industry, topsoil and so on. It is mainly divided into natural sources and human sources. The natural sources are mainly soil, dust and rock, which are split into fine particles by weathering and transported to the atmosphere by the aerodynamic system. Human sources mainly refer to industrial dust, construction dust, traffic dust, etc.
In addition, the source and composition of atmospheric dust vary greatly due to the geographical location, climatic conditions, seasons and human activities. For example, the atmospheric dust in desert area mainly comes from sand, laterite and sand particles, while in urban environment contains a large amount of limestone from building materials, carbides from automobile exhaust and fabric fibers.
At present, most of the built solar photovoltaic power systems are not equipped with special dust cleaning facilities, which mainly rely on natural effects such as rainfall and wind to remove the dust. Some small-scale solar photovoltaic stations, especially in the household solar energy system, the householder often sprays water or sweeps dust randomly, so the cleaning effect is not good.
Although the electric curtain dust removal technology is relatively mature and has been applied to small-area solar photovoltaic panels, if it is applied to ground photovoltaic power systems, it will encounter problems such as increased panel costs, reduced conversion efficiency, and secondary dust accumulation. Therefore, the cleaning technology of the solar panel needs to be broken in terms of principles, methods and new technologies.