Recently, the “Seminar on efficient and reliable operation of domestic power stations and photovoltaic materials technology†held by the Qinghai Provincial Development and Reform Commission jointly with the China Renewable Energy Society and DuPont Company was held in Xining. The problems in the construction, operation, and quality control of large-scale photovoltaic power plants, solutions and safeguard measures caused a heated discussion among the guests. As we all know, if photovoltaic power generation is to achieve effective competition in the main power market, it is necessary to reduce the cost of electricity. The cost of electricity is mainly affected by initial investment, solar energy resources, and system power generation. Among them, the amount of power generation is limited by fixed irradiation conditions, the quality of photovoltaic modules determines the amount of power generation, and thus determines the cost of electricity. The largest share of PV modules as the initial investment, the higher the quality of PV modules and the longer the service life, the higher the power generation and the lower the cost of electricity. Zhang Juncai, deputy general manager of China Power Investment Yellow River Hydropower Co., Ltd. believes that materials are the fundamental guarantee for the service life of photovoltaic modules. At the same time, materials also have a great impact on reducing system annual efficiency decay. Advanced materials can improve the efficiency of photovoltaic modules. Zhang Juncai shared a set of data from the CLP Golmud Phase I PV power plant. The 200MW PV power plant uses components from 6 suppliers. After 9 months of operation, the company conducted a test on all components. The results show that the component powers of the six suppliers are all negative deviations with an average deviation power of up to -13.63 W. The average power loss is 7 W/block. The photovoltaic components of these manufacturers all exhibit yellowing, cracking, bubbles, and delamination to varying degrees, indicating that there are problems with the quality of the PV module materials, resulting in power loss of the modules. This results in a reduction in the amount of photovoltaic power generated, and the net result is an increase in the actual cost of electricity. “According to 4.3 hours of average daily hours in Golmud, 80% of the overall efficiency, a 7W reduction in the power of a photovoltaic module will result in a 300MW solar power plant generating about 13.5 million kWh less per year.†Zhang Juncai believes that for the severe weather conditions in the western region, we must select high-quality materials, components, and systems in the early stage to avoid quality problems and reduce the cost of electricity and increase the return on investment. Zhang Shengzhong, chief engineer of the New Energy Division of TBEA, has a profound view on the quality control of key components in the PV power plant system during the selection process. He said, “In the market environment where cost competitiveness is sought to reduce costs, the There are more and more quality problems and more and more hidden.For example, the strength of aluminum alloy frame materials decreases, which directly causes the frame of the photovoltaic panel to fall off or tear when the strong wind occurs, and the EVA film is prematurely aged and yellow, which affects the components. Light rate, thus affecting the power generation of photovoltaic power plants; the sealing performance of the junction box is reduced, resulting in oxidation and corrosion of the metal live parts in the junction box. The increase in contact resistance not only affects the electrical conductivity, but also leads to heat generation; due to the defective mechanical properties of the components, The photovoltaic power plants that have been built with double-glass thin-film modules currently suffer from large-area ruptures due to the influence of temperature on the components, which poses hidden dangers for the operation of the power station. “For investors, the occurrence of these problems will have the consequences of damaged power generation, increased maintenance, increased operating costs, and reduced investment income. Therefore, quality control in the selection process of components is particularly important. Quality is the supply and demand. The bottom line that both parties should maintain." Zheng Xianzhi, president of DuPont Electronics and Communications Division Greater China, believes that many practitioners use materials that have not been validated by the actual performance, causing many problems in photovoltaic modules and systems. The service life of the system has a significant impact on the return on investment of photovoltaic projects, in which material is the key. Therefore, only insisting on the use of high-quality, time-tested materials is the key to truly ensuring the return on investment and the sustainable development of the photovoltaic industry. After more than two years of in-depth adjustment period in the photovoltaic industry, we are pleased to see that more and more photovoltaic manufacturers have shifted from the pursuit of speed and scale to the pursuit of quality. More and more PV module manufacturers and developers have begun to use high-quality materials to establish long-term competitive advantages. Many downstream power station developers are also actively summing up the experiences and lessons plagued by quality problems in early-stage investment projects and establishing more detailed Enterprise technical quality standards to ensure the quality of the project. Through the specification of key material lists to eliminate the occurrence of potential quality problems, to greatly reduce the operation and maintenance costs and investment risks of more than 25 years. The cost pressure can be completely solved by the improvement of the module efficiency and the extension of the service life. The issue of external distributed generation and grid connection involves the reform of the power system, and it is difficult to solve it fundamentally.
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