People stand in large bodies of water and feel cool. This is because large bodies of water absorb the heat of the air and evaporate, causing the temperature of the air to drop, giving us cool, cool air. Similarly, the temperature of the micro-climate environment of aquatic photovoltaic power plants will also be lower than the surrounding ground.
It is well known that the peak power of silicon photovoltaic modules decreases with increasing temperature (directly affects the efficiency), that is, the peak power loss rate of silicon photovoltaic modules is about 0.3% for every 1°C increase in temperature. Therefore, the amount of electricity generated by the hydro photovoltaic power station will benefit from the decrease in the ambient temperature caused by evaporation of water.
This station model uses 15° fixed brackets. In this paper, the temperature calculation method is the synthesizer measurement method and the empirical formula method. Since the conversion factor in the instrumental measurement in this region could not be obtained, 0.96 was taken according to experience. At the same time, the thermal conductivity coefficient of the PV module backplane and the cell was also not taken into consideration. Get the following conclusions:
The first-degree theoretical power generation hours of 15° fixed brackets without considering the reduction of the ambient temperature caused by evaporation of water are 1269hr; after consideration, it is 1302.3hr, and the increase of power generation is about 2.62%.
Because of the method used in this article, there are the following limitations:
1. Due to the lack of analysis of the water vapor gradient in the calculation method (corresponding to the difference in the temperature of each height of the photovoltaic module), the calculation result is not accurate;
2. As mentioned above, the thermal conductivity coefficient of the backsheet and the solar cell of the photovoltaic module is not taken into consideration, that is, the actual temperature of the solar cell may be inconsistent;
3. The empirical formula lacks the variables related to wind speed and radiation, and its calculation accuracy is poor.
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