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The World Energy Commission (WEC) predicts that oil will be exhausted after 43 years, and natural gas will be exhausted after 66 years, and the coal with the largest amount of resources will only be exploited in 169 years. Although some people disagree on these figures, it is said that new reserves are still being discovered, but fossil energy is drying up and energy shortage has emerged as an indisputable fact. With the growth of the global population, the increase of energy consumption, the severe environmental problems and the exhaustion of fossil energy, the development and utilization of renewable energy, such as solar energy, wind energy and biomass energy, are accelerating.

Solar energy utilization, especially solar photovoltaic power generation, has been highly valued worldwide. The developed western countries, such as Germany, the United States and Japan, have made great progress in the development of photovoltaic industry, and have made remarkable progress in the research, industry and application of solar cells, which have set a model for the development of renewable energy utilization in all countries.

In recent years, the solar energy industry in China has developed rapidly, among which the solar photovoltaic power generation technology has attracted much attention. The industrialization and market development of the solar photovoltaic power generation technology have laid a good foundation after nearly twenty years' efforts. The grid power generation industry has not been widely promoted, and land has become one of the limiting factors for large scale photovoltaic power stations. If the domestic PV market can be launched on a large scale, the cost of PV generation is expected to be further reduced.

There are two ways of solar photovoltaic power generation, one is to rely on the traditional battery to store the energy, that is, the solar photovoltaic independent system is also called the solar grid system, the other is the solar photovoltaic grid system. The local power grid can actually be regarded as a huge energy storage system, and the sun will be the sun. The power generated by the power generation system is transported to the power grid for the use of other loads, and when the electricity is needed, the electric power is obtained from the power grid, and the power grid will play the role of the battery.