Primary energy can be further divided into two categories: renewable and non-renewable energy. Renewable energy includes solar energy, hydro energy, wind energy, biomass energy, wave energy, tidal energy, ocean thermal energy, geothermal energy and so on.
Traditional energy is limited both in the world and in China. China's primary energy reserves are far lower than the world average, accounting for about 10 percent of the world's total.
Solar energy is a kind of inexhaustible renewable energy, which is clean enough, absolutely safe, relatively widespread, long service life, no maintenance, rich resources, great economic potential and so on.
It plays an important role in long-term energy strategy. Compared with a common thermal power system, the advantages of a solar PV system are mainly reflected in the composition of the solar PV system and the role of each part.
(1) No fatigue risk.
(2) Safe and reliable, no noise, no pollution emission, absolutely clean (no pollution).
(3) It is not limited by the geographical distribution of resources, and can make use of the advantages of the building roof. For example, the region without electricity and with complex terrain.
(4) The solar pv system types can generate and supply electricity locally without consuming fuel and setting up transmission lines.
(5) High energy quality.
(6) Easy to be accepted by users.
(7) Short construction period and short energy acquisition time.
With the rapid development of global economy and the progress of human beings, people have put forward higher and higher requirements for energy. The development of new energy has become an urgent task that human beings face at present.
New energy should meet two conditions at the same time. First, it should be abundant and will not be exhausted. Second, it is safe and clean, and will not threaten human beings and destroy the environment.
New energy sources found now are devided into solar energy, wind energy, fuel cells. The sun shines on the Earth, and the energy is very huge. The solar energy shines on the earth for about 40 minutes, which is enough to supply the global human energy consumption for a year.
It can be said that solar energy is truly inexhaustible energy. And solar power generation is absolutely clean without public hazards. So solar PV system power generation is the ideal energy which is widely used and promising .
The development potential of solar PV system is huge. It is one of the most sustainable renewable energy technologies. At present, although China's solar PV power generation technology has become increasingly mature, it is necessary to make solar power generation be truly utilized to provide the driving force for the long-term development of solar PV systems.