Research method and formula principle of photovoltaic power generation

Research methods of photovoltaic power generation: the first category: based on the research of historical meteorological data and photovoltaic power generation data, the statistical method is used to analyze and model; The second category: based on satellite cloud image data and ground monitoring data, the real-time solar radiation prediction method is calculated through satellite and radar image processing; The third category: forecasting methods based on numerical weather forecast.

Principle: The main principle of photovoltaic power generation is the photoelectric effect of semiconductor. When a photon irradiates a metal, its energy can be completely absorbed by an electron in the metal. The energy absorbed by electrons is large enough to overcome the coulomb force work inside metal atoms and escape from the metal surface to become photoelectrons. Silicon atoms have four outer electrons. If pure silicon is doped with atoms with five outer electrons, such as phosphorus atoms, it becomes an N-type semiconductor. If pure silicon is doped with atoms with three outer electrons, such as boron atoms, a P-type semiconductor is formed. When P-type and N-type are combined, the contact surface will form a potential difference, which will become a solar cell. When the sun shines on the pn junction, the current flows from the P-type side to the N-type side, forming a current.