Two ways of solar photovoltaic power generation

There are two ways of solar power generation: one is light-heat-electricity conversion, and the other is light-electricity direct conversion. (1) The light-heat-electric conversion method generates electricity by utilizing the thermal energy generated by solar radiation. Generally, the solar collector converts the absorbed thermal energy into the steam of the working medium, and then drives the steam turbine to generate electricity. The former process is a light-to-heat conversion process; the latter process is a heat-to-electricity conversion process, which is the same as ordinary thermal power generation. The disadvantage of solar thermal power generation is that the efficiency is very low and the cost is high. It is estimated that its investment is at least higher than that of ordinary thermal power generation. The power station is 5 to 10 times more expensive. A 1000MW solar thermal power station requires an investment of 2 billion to 2.5 billion US dollars, and the average investment of 1kW is 2000 to 2500 US dollars. Therefore, at present, it can only be applied to special occasions on a small scale, and large-scale utilization is very uneconomical and cannot compete with ordinary thermal power plants or nuclear power plants. (2) Light-to-electricity direct conversion method This method uses the photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device of light-to-electricity conversion is solar cells. A solar cell is a device that directly converts sunlight energy into electrical energy due to the photovoltaic effect. It is a semiconductor photodiode. When the sun shines on the photodiode, the photodiode will convert the sun's light energy into electrical energy and generate electricity. current. When many cells are connected in series or in parallel, it can become a solar cell array with relatively large output power. Solar cells are a promising new type of power source with three major advantages: permanence, cleanliness and flexibility. Solar cells have a long service life. As long as the sun exists, solar cells can be used for a long time with one investment; and thermal power, nuclear power generation. In contrast, solar cells do not cause environmental pollution; solar cells can be large, medium and small, ranging from a medium-sized power station of 1 million kilowatts to a solar battery pack that can only be used by one household, which is unmatched by other power sources. The sunlight is used as energy, and solar radiation is received through solar cell modules during the day, the light energy is converted into electrical energy, and the battery is continuously charged under the management of the controller. When in use, the controller releases the electrical energy in the battery according to the set program. Supply power to electrical equipment. Install an inverter with a protective device to supply power to AC equipment. Company: Shanghai CHZ Changhui Lighting Technology Co., Ltd. Website: www.chz-lighting.com