The use of solar panels is increasing, and the support of the state is increasing. When consumers choose to install solar panels, we must understand the price and the principle of solar panel power generation. Here, we will introduce it to you. What is the principle of solar panel power system?
The sun shines on the semiconductor p-n junction to form a new hole-electron pair. Under the action of the p-n junction electric field, the hole flows from the n region to the p region, and the electron flows from the p region to the n region, and the current is formed after the circuit is turned on. This is the principle of photoelectric effect solar panels.
First, solar power generation Solar power generation has two ways, one is the light-heat-electric conversion method, and the other is the light-electric direct conversion method.
(1) The light-heat-dynamic-electrical conversion mode generates electricity by using thermal energy generated by solar radiation. Generally, the solar collector collects the absorbed heat energy into the working medium vapor, and then drives the steam turbine to generate electricity. The former process is the light-to-heat conversion process; the latter process is the heat-to-dynamic conversion to the final 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, and its cost is at least It is 5 to 10 times more expensive than ordinary thermal power stations.
(2) Light-to-electric direct conversion method This method uses photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device for photoelectric-electrical conversion is solar cells. A solar cell is 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 light into electrical energy. Current. When many batteries are connected in series or in parallel, they can become a square of solar cells with relatively large output power. Solar cells are a new type of power source with potential for development. They have the advantages of eternality, cleanliness and sensitivity. The long life of solar cells requires only the presence of the sun, and solar cells can be temporarily used for investment; compared with thermal power generation. Solar cells will not cause environmental pollution.
Photovoltaic power generation system is composed of solar cell array, battery pack, charge and discharge controller, inverter, AC power distribution cabinet, sun tracking control system and other equipment. Photovoltaic power generation systems are divided into independent photovoltaic power generation systems, grid-connected photovoltaic power generation systems and distributed photovoltaic power generation systems.