At present, solar photovoltaic power generation systems are mainly used in the following three major aspects.

(1) To provide power for the occasions without power, mainly for the life and production of residents in the areas without power, microwave relay stations and mobile phone base stations to provide power.

(2) Solar daily electronic products, such as all kinds of solar chargers, solar street lights and solar lawn lights, etc.

(3) grid-connected power generation, that is, connected to the national grid. China’s grid-connected photovoltaic power generation has been very mature. Since 2013, the state has introduced a series of policies to promote photovoltaic power generation, encouraging the construction of photovoltaic power generation facilities in industrial and commercial areas, households and public buildings where conditions permit.

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2. Advantages of solar power generation

Through the comparative analysis of several common new energy sources such as biomass energy, water energy, wind energy and solar energy, it can be clearly seen that solar power generation has the following unique advantages.

(1) Photovoltaic power generation has economic advantages.

The economy of solar energy can be seen from two aspects: first, the solar energy is inexhaustible, and when receiving the solar energy does not levy any “tax”, can be used anywhere; Second, at the current level of technological development, some solar energy has become economical. With the development of science and technology and the breakthrough of human development and utilization of solar energy technology, the economic utilization of solar energy will be more obvious. If the 20th century was the century of oil, the 21st century will be the century of renewable energy (solar).

From the perspective of the construction cost of solar photovoltaic power station, with the large-scale application and promotion of solar photovoltaic power generation, especially the maturity of the upstream crystalline silicon industry and photovoltaic power generation technology, and the composite development and utilization of roof, exterior wall and other platforms, the construction cost of solar photovoltaic power generation per kilowatt is getting lower and lower, which has the same economic advantages compared with other renewable energy sources. And with the implementation of the national parity policy, its popularity will be more and more widespread.

(2) led solar outdoor lightsenergy is an inexhaustible renewable energy source.

According to the calculation, the total amount of led solar outdoor lightsenergy reaching the earth’s surface in a year is equivalent to about 1.892×10^24 tons of standard coal, which is 10,000 times the proven reserves of the world’s main energy. The lifespan of the sun is at least 4 billion years, relative to human history, the led solar outdoor lightsenergy can continue to supply the earth can be said to be unlimited, which determines that the development and utilization of solar energy will be the most effective way to solve the shortage of conventional energy.

(3) No pollution to the environment.

Solar energy, like clean energy such as wind power and tidal power, is an ideal alternative energy source because it produces almost no pollution and has unlimited reserves. Traditional fossil fuels (coal, oil and natural gas) discharge a large number of toxic and harmful substances in the process of use, which will cause serious pollution to water, soil and atmosphere, form greenhouse effect and acid rain, and seriously endanger human living environment and health. Therefore, it is urgent to develop new and relatively clean alternative energy, and solar energy is an ideal clean energy. Is the world’s increasing attention.

From the point of view of the current carbon emission rate (g/kW·h) of various power generation methods, the upstream link is not calculated: 275g/kW·h for coal power generation, 204g/kW·h for oil power generation, 181g/kW·h for natural gas power generation, 20g/kW·h for wind power generation, and solar photovoltaic power generation is close to zero emission. And, in the process of power generation, there is no waste residue, waste, waste water, exhaust gas discharge, no noise, no harmful substances to human health, will not pollute the environment. Photovoltaic power generation is pollution-free

(4) The energy conversion link is the least.

From the aspect of energy conversion, lights solar photovoltaic power generation is the direct conversion of solar radiation energy into electric energy. Among all the renewable energy utilization, solar photovoltaic power generation has the least conversion links and the most direct utilization. Generally speaking, in the energy flow of the whole ecological environment, with the increase of the conversion link and the extension of the conversion chain, the energy loss will be geometrically increased, and the construction, operation cost and instability of the whole system will be greatly increased at the same time. At present, the practical level of photovoltaic conversion efficiency of crystalline silicon solar cells is 15%-20%, and the highest level in the laboratory has reached 35%.

(5) The most economical and environmentally friendly.

From the perspective of resource conditions, especially land occupation, bioenergy and wind energy are relatively strict, while lights solar energy utilization is very flexible. If the land area of solar photovoltaic power generation is 1, wind power is 8-10 times that of solar power, and biomass energy is 100 times that of lights solar power. In the case of hydropower, the construction of a large dam often requires flooding tens to hundreds of square kilometers of land. By contrast, solar outdoor lighting power generation does not need to take up more land, rooftops and walls can become places for solar energy photovoltaic power generation, but also can take advantage of the vast desert of our country, by building the solar energy photovoltaic power generation bases in the desert, directly reduce the desert area of direct solar outdoor lighting radiation to the surface, effectively reduce the surface temperature, and reduce evaporation. In turn, it makes the survival and growth of plants possible to a considerable extent, stabilizes and reduces the dune, and demands the clean and renewable energy needed from nature.

(6) Free to use and no transport required.

By means of specialized technology and equipment, the solar energy can be converted into heat or electricity, which can be used on the spot without transportation for the benefit of mankind. And the use of solar energy, an inexhaustible source of energy, is free. Although the solar outdoor lighting radiation is not uniform due to the difference of latitude and climate conditions, compared with other energy sources, solar energy is universal in most areas of the earth and can be used on the spot. This provides a bright prospect for countries and regions lacking in conventional energy to solve energy problems