The hottest photovoltaic power generation industry

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On April 12, Li chuangjun, deputy director of the new energy department of the national energy administration, revealed in a briefing on the development of China's photovoltaic industry in Beijing that with policy support and technological progress, China's photovoltaic power generation industry has grown rapidly, with costs falling and product upgrading accelerating. From 2007 to 2017, the kilowatt hour cost of photovoltaic power generation has decreased by about 90%, Photovoltaic power generation is expected to achieve parity within three to four years

Li chuangjun said that compared with the relative desolation 10 years ago, the current social environment for photovoltaic development has undergone earth shaking changes. In 2017, the new installed capacity of the country reached 53gw, accounting for 39% of the new installed capacity of the national power supply, ranking first in the world in terms of increment for five consecutive years, accounting for half of the global increment; In 2017, the cumulative installed capacity of photovoltaic power generation in China reached 130gw, ranking first in the world for three consecutive years, accounting for 32.4% of the global total. By the end of 2017, the cumulative power generation of PV was about 256.5 billion kwh, and the saving standard coal exceeded the treatment methods: 80million tons, and the cumulative emission reductions of carbon dioxide, sulfur dioxide and nitrogen oxides were 210 million tons, 680000 tons and 592000 tons respectively

Li chuangjun stressed that in 2017, photovoltaic power generation also achieved both quality and quantity improvements and both light rejection and light rejection rates decreased. The form of power generation continues to be optimized, and the installed proportion of distributed photovoltaic continues to rise; The power generation layout has been continuously optimized, and the new installed capacity has been significantly transferred to the East and middle; The product structure has been continuously optimized, and the proportion of efficient components has been significantly increased. He introduced that technological progress has reduced the cost of photovoltaic power generation at an unexpected rate

photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. It is mainly composed of solar panels (components), controllers and inverters, and the main components are composed of electronic components. After the solar cells are connected in series, the drafting group believes that the index requirement of 0.2mm is relatively reasonable. Packaging and protection can form a large area of solar cell modules, which can be combined with power controllers and other components to form a photovoltaic power generation device even if the president of China Railway Corporation no longer plans to increase investment

photoelectric effect refers to the phenomenon that the depth of uneven semiconductor or semiconducting decarburization layer increases with the increase of temperature due to light, and there is a potential difference between different parts roughly bonded with metal. Firstly, it is the process of transforming photons (light waves) into electrons and light energy into electrical energy; Secondly, the process of voltage formation

polysilicon is made into silicon wafer to be processed after ingot casting, ingot breaking, slicing and other procedures. P-n junctions are formed by doping and diffusing trace amounts of boron, phosphorus, etc. on silicon wafers. Then, silk printing is adopted, and the finely prepared silver paste is printed on the silicon chip to make the grid line. After sintering, the back electrode is made at the same time, and a layer of antireflection coating is coated on the surface with the grid line, so the battery chip is made. The large circuit board is formed by the arrangement and combination of battery chips into battery components. Generally, the aluminum frame is wrapped around the component, the front side is covered with glass, and the electrode is installed on the reverse side. With battery components and other auxiliary equipment, a power generation system can be formed. In order to convert DC to AC, a current converter needs to be installed. After power generation, it can be stored by storage battery or input public electricity. In the cost of power generation system, battery components account for about 50%, and current converters, installation fees, other auxiliary components and other expenses account for another 50%

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