Principles of solar power generation
2021-11-10
Sunlight shines on the semiconductor p-n junction to form new hole-electron pairs. Under the action of the p-n junction electric field, holes flow from the p-zone to the n-zone, and electrons flow from the n-zone to the p-zone, and a current is formed after the circuit is turned on. This is the working principle of photovoltaic effect solar cells.
Solar power generation There are two methods of solar power generation, one is the light-heat-electric conversion method, and the other is the light-electric direct conversion method.
(1) The light-heat-electric conversion method uses solar radiation to generate electricity. Generally, a solar collector converts the absorbed heat into vapor of the working fluid, and then drives a steam turbine to generate electricity. The former process is a light-heat conversion process; the latter process is a heat-electric conversion process.
Solar power generation There are two methods of solar power generation, one is the light-heat-electric conversion method, and the other is the light-electric direct conversion method.
(1) The light-heat-electric conversion method uses solar radiation to generate electricity. Generally, a solar collector converts the absorbed heat into vapor of the working fluid, and then drives a steam turbine to generate electricity. The former process is a light-heat conversion process; the latter process is a heat-electric conversion process.
(2) The light-electricity direct conversion method uses the photoelectric effect to directly convert solar radiant energy into electrical energy. The basic device of the light-electricity conversion is the solar cell. 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 turn the sun’s light energy into electrical energy to produce Current. When many batteries are connected in series or in parallel, a square array of solar cells with relatively large output power can be formed.
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