What is the power loss caused by dust occlusion? Many people have done professional research on this issue. Before, I also discussed this issue with many owners. I had a very good general manager of the power station and did a comparative experiment. I am fortunate to have their comparative experimental data, I hope to give you some help.
Note: This result is only for one experiment of the sample power station. Different power plants have different conditions and the results will be different. This result is not widely representative!
1. Basic situation of the sample power station
Located in a large ground power station near Hohhot, Inner Mongolia, the local air quality is good, there is no smog effect, and there is less dust and sand.
2, cleaning instructions
This cleaning is a daily cleaning, cleaning after non-dust storms, and there is no thick dust on the PV modules.
3, experimental design
In order to eliminate other interference factors and fully verify the impact of dust occlusion on the sample PV power plant, several sets of comparative tests were designed. The comparison will be affected by the following factors:
1) Impact of solar energy resources
Due to the long time required to clean the sample photovoltaic power plant, the solar energy resources will change before and after cleaning. In order to eliminate the influence of changes in solar energy resources, the cleaning power generation unit and the unwashed power generation unit are used for comparison of the same time period (the same solar energy resources);
2) Influence of power generation unit differences
Due to different power generation units, the PV modules and other equipment and construction quality will be different. Even under the same solar energy resources, the power generation of different power generation units will be different. In order to eliminate the influence of the difference between the power generation units, the difference before cleaning and the difference after cleaning are compared and analyzed.
3) Influence of inverter differences
The sample power plant uses the same type of PV modules, but uses four types of inverters. In order to eliminate the effects of inverter differences, the four types of inverters were compared separately.
The comparison scheme is designed as follows.
Table 1 Sample PV dust shielding test design
4. Experimental results
The comparison results of the four inverters are as follows.
Table 2 Experimental results of inverter 1 (unit: kWh/day)
Table 3 Experimental results of inverter 2 (unit: kWh/day)
Table 4 Experimental results of inverter 3 (unit: kWh/day)
Table 5 Experimental results of inverter 4 (unit: kWh/day)
The comparison results of the four inverters are summarized below.
Table 6 Comparison of experimental results of different inverters
The effects of dust are judged by comparing the results of the four inverters. For the sample power station selected in this experiment, the power generation loss was about 3.79% before and after cleaning.
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