Do you know the advantages and disadvantages of solar photovoltaic power generation?

First of all, solar photovoltaic power generation is to use the light born v effect a process of convert sunlight to electricity, is a method of human efficient direct use of solar energy. Since the 1950 s began to produce the first piece of solar cell, to now

in the first place, the solar photovoltaic power generation is a process of solar energy into electricity by photovoltaic effect. This is the high efficiency, a method of the direct use of solar energy. Since the 1950 s made the first solar battery, solar cell mass manufacturing and installation does not take too long time. Solar battery technology is still in the period of rapid development. Since this is a conversion process, it involves the transformation process of evaluation. We usually use the photoelectric conversion efficiency of solar cell parameters to evaluate the transformation process, namely the ratio of electricity to the input light. International standard measuring method ( Ground use, empty battery is another measure) Is in the AM1. 5 unit of measure under the condition of lighting area of solar cell power output, its value is equal to the conversion efficiency. At present, the lab is the highest level in more than 42%. Factory production line level at 20%, is expected in the second half of the production level will be improved greatly. In ordinary polycrystalline silicon solar cell components, for example, size is about 1. 6 m x 0. 9 m. If the rated power is 260 w, that is, when the irradiation power density is 1000 watts per square meter and its spectral distribution in AM1. The five standards within the error range, the environment temperature is 25 degrees Celsius, the output power of 260 w in actual use conditions, the maximum output power will be affected by light conditions, temperature, wind speed, the influence of factors such as the installation conditions. Usually, the maximum output power does not exceed the rated power 1. Three times. The actual output power depends on the load connected to the output impedance, this is the meaning of the maximum power tracking. Where there is light, can generate electricity. This is the basic working principle of solar cells, as well as their biggest advantage. Power generation process does not need to consume any traditional materials, does not produce noise, exhaust gas and waste, no pollution. As for the pollution problems in the process of the solar cell production, there has been much discussion, but no further details. For the shortcomings, more accurately the current technology is limited. The most critical is the instability of output power, because the light is absorbed by the atmosphere of the earth's sun, the earth's orbit and rotation lead to changes in the location of the light on the ground, to change the output power accordingly. There are many ways to stable production, but at present the production cost of solar cells is still high, which makes the method is not economic. Therefore, at present, the instability of the photovoltaic power output measures must be through the energy storage ( Grid, battery, etc. ) Into the stability of the available power. ) 。 We believe that the solar cells will eventually become a kind of very cheap semiconductor devices, and the stability problem can be resolved in the absence of energy storage. As to the problem of intermittent, we all have a 'fantasy', namely the global solar power grid, namely install enough solar cells around the earth, the super solar pv power station can be for the human to produce enough power in the world. It will come true! The second limitation is caused by relatively low conversion efficiency, it requires the installation of large area, and not like nuclear power miniaturization and miniaturization. With the development of technology, the problem will be improved to a certain extent, but even if the conversion efficiency of 100%, there are 1000 watts per square meter or more. Enrichment, of course, the battery will be more efficient.