When the actual installed capacity of the photovoltaic power station is constant, the power generation of the photovoltaic system is determined by the radiation intensity of the sun, and the amount of solar radiation has a positive correlation with the power generation. The radiation intensity and spectral characteristics of the sun change with the meteorological conditions. So, what are the factors that affect the power generation of solar photovoltaic power plants?

1. Solar resources

When the actual installed capacity of the photovoltaic power station is constant, the power generation of the photovoltaic system is determined by the radiation intensity of the sun, and the amount of solar radiation has a positive correlation with the power generation. The radiation intensity and spectral characteristics of the sun change with the meteorological conditions.

2. Solar panel installation method

The radiation amount of the inclined surface at different installation angles in the same area is different. The radiation amount of the inclined surface can be increased by adjusting the inclination of the panel (the bracket adopts a fixed and adjustable type) or installs a tracking device (the bracket adopts a tracking type).

3. Solar inverter capacity ratio

The inverter capacity ratio refers to the ratio of the rated power of the inverter to the capacity of the PV modules it carries.

Since the power generation of the photovoltaic module is transmitted to the inverter, there will be many links in the middle, which will cause reduction, and the inverter, box transformer and other equipment cannot reach full load most of the time. Therefore, the capacity of the photovoltaic module should be slightly larger than Inverter rated capacity. According to experience, in areas with better solar energy resources, photovoltaic modules: inverter = 1.2:1 is an optimal design ratio.

4. Solar panel series and parallel matching

The series connection of modules will cause current loss due to the current difference of the modules, and the parallel connection of the modules will cause voltage loss due to the voltage difference of the strings.

5. Solar panel occlusion

Solar panel shielding includes dust shielding, snow shielding, weeds, trees, Solar panels and other buildings, etc. shielding will reduce the amount of radiation received by the Solar panel, affect the heat dissipation of the Solar panel, and cause the output power of the Solar panel to drop, and may also cause heat. spot.

6. Solar panel temperature characteristics

As the temperature of the crystalline silicon cell increases, the open circuit voltage decreases. In the range of 20-100 °C, the voltage of each cell decreases by about 2mV for every 1 °C increase; while the current increases slightly with the increase of temperature. In general, the power of solar cells decreases with increasing temperature, and the typical power temperature coefficient is -0.35%/℃, that is, for every 1℃ increase in battery temperature, the power decreases by 0.35%.

7. Solar panel power attenuation

The attenuation of module power refers to the phenomenon that the output power of the module gradually decreases with the increase of illumination time. Solar panel attenuation is related to the properties of the Solar panel itself. The attenuation phenomenon can be roughly divided into three categories: sudden power attenuation of Solar panels caused by destructive factors; initial light-induced attenuation of Solar panels; aging attenuation of Solar panels.

8. Equipment operation stability

Equipment failure and shutdown in the photovoltaic power generation system directly affect the power generation capacity of the power station. For example, if the AC equipment above the inverter fails and shuts down, the loss of electricity will be huge. In addition, the device is running but not running at its optimum performance, which can also cause power loss.

9. Routine maintenance

Routine maintenance and overhaul is a must for the power station. Arranging the overhaul plan can reduce the loss of electricity. The power station should reasonably set the maintenance time according to its own situation, and at the same time, it should improve the work efficiency of the maintenance and reduce the power generation loss due to the normal maintenance and maintenance of the power station.

10. Grid Consumption

Due to grid consumption, grid dispatching in some regions requires photovoltaic power plants to operate with limited power.

Summarize

Factors affecting the power generation of photovoltaic power plants include solar energy resources, module installation method, inverter capacity ratio, module series-parallel matching, module shading, module temperature characteristics, module power attenuation, equipment operation and maintenance stability, routine maintenance and grid consumption. These factors all affect the power generation capacity of the power station to varying degrees.