NEWS



22

2022

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11

The impact of dust pollution on the power generation of photovoltaic power plants

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In 2020, a photo of egrets flying together has attracted great attention in the photovoltaic circle. Just because birds poured a lot of guano on photovoltaic panels.

In March 2021, sand and dust swept through many cities in northern China.

The northwest region has China's abundant solar energy resources, with a dry climate, little rainfall and long direct sunlight time. However, frequent sand and dust weather brings great trouble to solar power generation.

Various problems can be seen, distributed roof projects, pollution sources are wide-ranging, scattered, and there are many types of pollution.

Ash pollution has a great impact on photovoltaic power generation.

Dust pollution classification

1. Natural dust

Sand, dust, etc

2. Oily dust.

Commonly found in chemical plants and machine processing plants.

3. Metal dust.

It is difficult to remove natural dust after long-term accumulation, and it is common in steel mills and mechanical processing.

4. Organic dust.

It is difficult to clean for a long time, and the glass surface of the component forms corrosion, which is common in lumber mills, textile mills, and bird habitats.

5. Mineral dust.

Low adhesion, mixing with rain and natural dust will increase the difficulty of cleaning, common in stone factories and cement factories, long-term accumulation mixed with rainwater will produce compaction and calcification. The presence of acids or alkaline substances can corrode component frames and component glass.

Effects of dust pollution

1. The light transmittance is reduced, and the dust accumulation of the part will block the sunlight, resulting in a decrease in the solar radiation energy received by the part cell.

2. Reflectivity rises, acid or alkaline ash will cause corrosion of component glass, even if the corroded glass is not covered by dust, it will cause the groove reflection after corrosion by part of the solar radiation.

3. The hot spot effect caused by the ash accumulation belt increases the local glass temperature. At the same time, impurities and sodium salts in the ash accumulation belt can damage the coating at high temperatures, forming an irreversible rainbow belt. Even if the dirt accumulation band is washed clean, the light transmittance of this area decreases.

4. The ash accumulation band leads to a decrease in the resistance of the glass surface at the lower edge, an increase in the leakage current of distributed photovoltaic power generation from the glass surface to the aluminum frame, and a high PID attenuation of the lower cell sheet.