What are the factors affect the photovoltaic power station capacity?

In long life cycle of photovoltaic power station, power generation has been investors focused on top priority. So, what are the factors affect the photovoltaic power generation? 1. Solar energy resources in the photovoltaic power station under the condition of actual capacity must, photovoltaic system

in the long life cycle of photovoltaic power station, power generation is the key of the investors. So, what are the factors affect the photovoltaic power station power generation? 1. Solar energy resources in the photovoltaic power station actual installed capacity of a certain case, the output of pv system is decided by the intensity of solar radiation ( Solar radiation and is closely relative to capacity) 。 The sun's radiation intensity and spectral characteristics will change as the change of weather conditions. 2. Component installation method in the same area, cant Angle leads to different components of radiation is different. Therefore, by adjusting the Angle panels ( Stents with fixed adjustable) Or increase the tracking device ( Stents using tracking) To increase the radiation on the inclined plane. 3. Inverter capacity than inverter capacity than it is to point to the rated power of the inverter and the ratio of the capacity of the pv module. As a result of the pv module generating capacity in the process of transmission to the inverter will be reduced in many aspects, and the inverter in most of the time can't run at full capacity, so the capacity of the pv modules should be slightly greater than the rated capacity of inverter. According to experience, photovoltaic modules: inverter = 1. 2:1 is the optimum design for the solar energy resources better area ratio. In active matching case, due to the influence of inverter power rating, in the components during the actual power higher than the rated power inverter, the system will work with inverter power rating. When the actual power of the component is smaller than the rated power of the inverter, the system will be based on the actual power of the component. 4. Parts of the series and parallel matching when components in series, because the current element is bad, will cause the current loss. When series-parallel, because the voltage difference between the string and will cause the voltage loss. CNCA / CTS00X - 2014 'grid photovoltaic power station technical specification for performance testing and quality evaluation, Draft) Requirements, component mismatch in series and parallel mismatch loss of not more than 2%. 5. Components keep out receiving radiation shielding will reduce the components, and affect components of cooling, thus resulting in a decline in the power output of the components, and could lead to a hot spot. As shown in the figure below, shielding components including dust, snow, grass, trees, the shielding panels and other buildings. 6. Parts of the temperature rise, as the crystalline silicon cells reduce the open circuit voltage. In the twenty - 1 ℃, 100 ℃ range, every each battery voltage to reduce 2 mv. However, as the temperature rises, the current increases slightly. Generally speaking, the solar battery power and decreased with the increase of temperature, temperature coefficient of a typical power - 0. 35% / C, that is, the battery temperature rise per 1 ℃, power reduction 0. 35%. 7. Component of power attenuation component power attenuation refers to the components of output power of light increases with time and gradually reduce the phenomenon. Component attenuation is related to the characteristics of the component itself. Attenuation phenomena can be roughly divided into three categories: suddenly element of power attenuation caused by destructive factors; Components of the initial light to decay; Component aging decay. According to the CNCA/CTS00X - 2014 'grid photovoltaic power station technical specification for performance testing and quality evaluation. Polysilicon components falling rate no more than two a year. 5%; Two years of not more than 3. 2%; Monocrystalline silicon components falling within one year should not exceed 3. Should not be more than 4 0% in two years. 2%.