1. Solar power system - Solar light power generation
Solar power is a power generation method that does not require a thermal process to convert light energy directly into electricity. Including photovoltaic power generation, photochemical power generation, photoinductive power generation, photobiological power generation. Photovoltaic power generation is a direct power generation method that uses solar level semiconductor electronic equipment to effectively absorb solar radiation energy and convert it into electric energy. It is the mainstream of solar power generation today. The photochemistry development has electrochemical photovoltaic cell, photoelectric solar cell, photoshu photovoltaic cell, the actual application is photovoltaic cell.
Solar power generation system is mainly composed of solar cells, batteries, controllers and inverters. The solar cell is the core part of the solar power generation system, and the quality and cost of the solar panel directly determine the quality and cost of the whole system. Solar cells are mainly divided into crystalline silicon cells and thin film cells. Electrons include monocrystalline silicon cells, polycrystalline silicon cells, mainly amorphous silicon solar cells, copper ingot solar cells, bromine solar cells.The photoelectric conversion efficiency of monocrystalline silicon solar cells is about 15% and up to 23%, which is the highest among solar cells, but the manufacturing cost is high. Monocrystalline silicon solar cells generally have a life span of 15 years and 25 years. Polycrystalline silicon solar cells have a photoelectric conversion efficiency of 14% ~ 16%. Compared with monocrystalline silicon solar cells, the production cost is lower, so it has been greatly developed. However, polycrystalline silicon solar cells have a shorter life span than monocrystalline silicon solar cells.
Through water or other working medium and devices will be the solar radiation energy into electric power generation method called solar power generation. There are two ways to do this: first convert solar energy into heat, and then convert heat into electricity. One is to convert solar energy directly into electricity. For example, the development of temperature difference of semiconductor or metal materials, the development of thermoelectric and thermoelectric ions of vacuum devices, the thermoelectric conversion of alkali metals, and the development of magnetic fluids. Another method is to generate electricity by turning on solar energy (such as a steam turbine) to drive a generator. This is similar to existing thermal power generation, but the heat comes from solar energy rather than fuel. There are many types of solar power generation, including tower system, trough system, disk system, solar cell, and solar tower thermal power generation. The first three are concentrated solar power generation systems and the last two are non-concentrated solar power generation systems. Some developed countries regard solar power generation technology as the focus of national research and development, and have established dozens of demonstration power stations of various kinds of solar power generation, reaching the practical application level of grid-connected power generation.
At present, the promising solar power generation system can be divided into trough parabolic focus system, solar tower focus system and disk parabolic focus system. The three technically and economically possible forms are 30~ 80MW parabolic solar power technology (parabola). The 30~ 200MW integral focuses on central receiving solar power generation technology (called central receiving). The 7.5-25 kW credits are focused on parabolic solar power generation technologies (parabolic disks).
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