A unique strategy to solve the problem of ash accumulation in photovoltaic panels

A unique strategy to solve the problem of ash accumulation in photovoltaic panels

Polaris Solar Photovoltaic Network
Keywords: photovoltaic power generation solar panels photovoltaic power plants

Ash accumulation

In the practice of some photovoltaic engineering, due to the neglect of the ash accumulation on the surface of the photovoltaic panel, the surface of the photovoltaic panel is not cleaned by others, and naturally, the surface of the photovoltaic panel is sometimes deposited with a thick layer of dust attached to the photovoltaic. The surface of the board reduces the light transmittance. According to the dust test of a 1MW-scale power station, it is found that the photovoltaic power generation efficiency is 7.6% in the state of dust accumulation, the photovoltaic power generation efficiency is 9.3% in the state without dust accumulation, and the efficiency difference is 1.7%. It can be seen that the ash accumulation has a significant impact on the photovoltaic power generation efficiency. When the dust accumulates to a certain extent, not only the current power generation is affected, but also the acid-alkaline dust adheres to the photovoltaic panel and will also corrode the glass cover plate, which will cause irreversible damage to the photovoltaic panel and reduce the conversion efficiency of the photovoltaic module for a long time. .

Common solution strategy

According to relevant research, PV power plant operators generally attach importance to the impact of ash on the performance of PV power plants, and have taken certain measures to deal with them. For example, large-scale ground power stations in the west generally adopt the “photo-complementary” mode to install sprinklers under photovoltaic panels. The photovoltaic panels are sprayed regularly, and the water used for cleaning the photovoltaic panels is used to irrigate the plants, and the plants are used to raise animals to form a perfect ecological industrial chain. For example, in the roof power station in the eastern region, the operation and maintenance personnel will be regularly arranged to wipe or flush the photovoltaic modules to ensure that the photovoltaic panels have a good operating state.

Of course, there are also equipment developments, such as automatic ash cleaning devices, spraying ionic membranes on photovoltaic modules, and reducing dust attachment. However, such technologies require a R&D to mass production process, and the current high price cannot be a conventional solution.

In the conventional solution, the water in the west and the manpower in the east are relatively high-cost resources. How to find a balance between power generation efficiency improvement and cost control is a concern of PV power plant operators.

Unique solution strategy

Software is not only the "eye" of photovoltaic power plants, it helps operators to see problems, but also the "brain" of photovoltaic power plants, helping operators to think about how to solve problems, or the "alarms" of photovoltaic power stations, always reminding specific operation and maintenance personnel to deal with them in time. problem.

According to the long-term research of relevant institutions, a reasonable alarm threshold is set for the research of photovoltaic panel efficiency of ash deposition, and the degree of ash accumulation of photovoltaic panels is alarmed by the reduction of photovoltaic panel conversion efficiency, and the specific operation and maintenance personnel of the power station are reminded to clean the photovoltaic panels. At the same time, for each cleaning alarm and cleaning result are recorded and recorded in the month, quarter and year as a whole, so the economic benefits brought by the work to the photovoltaic power station and the cost paid for it to achieve the best balance point.

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