There are two ways of solar power generation, one is light - heat - electricity conversion, the other is the optical - electrical direct conversion.
(1) light - heat - electric conversion method through the use of solar radiation generated by thermal power, usually by the solar collector will absorb the heat into the refrigerant refrigerant, and then drive the turbine power generation. The latter process is the light-heat transfer process; the latter process is the heat-to-electrical conversion process, as is the case with ordinary thermal power generation. The drawback of solar thermal power generation is that the efficiency is low and the cost is high, Power station 5 to 10 times a 1000MW solar thermal power plant needs to invest 20 to 25 billion US dollars, an average of 1kW investment of 2,000 to 2,500 US dollars. Therefore, at present only small-scale application to special occasions, and large-scale use in the economy is very cost-effective, can not compete with ordinary thermal power plants or nuclear power plants.
(2) light - electric direct conversion method This method is the use of photoelectric effect, the solar radiation can be directly converted into electrical energy, optical - electrical conversion of the basic device is the solar cell. Solar cells are a device that converts solar energy directly into electrical energy due to the photovoltaic effect. It is a semiconductor photodiode. When the sun shines on the photodiode, the photodiode turns the solar energy into electricity. Current. When many batteries in series or in parallel can become a relatively large output power of the solar cell array. Solar cells are a promising new power supply, with permanent, cleanliness and flexibility of the three major advantages of solar cells long life, as long as the sun exists, solar cells can be an investment and long-term use; and thermal power, nuclear power generation Compared to solar cells will not cause environmental pollution; solar cells can be large and small simultaneously, large to millions of kilowatts of medium-sized power plants, small to only one for the use of solar cells, which is unmatched by other power