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Quality is fundamental - the industry joined hands to explore the way of photovoltaic development

on August 13, 2013, the "domestic power station efficient and reliable operation and photovoltaic material technology seminar" jointly organized by Qinghai Provincial Development and Reform Commission, China Renewable Energy Society and DuPont was held in Xining. The problems, solutions and safeguard measures in the construction, operation and quality control of large-scale photovoltaic power stations triggered heated discussions among the guests

as we all know, if photovoltaic power generation is to achieve effective competition in the main power market, it needs to reduce the cost of kwh. KWh cost is mainly affected by initial investment, solar energy resources and system power generation. Among them, the power generation is limited by fixed irradiation conditions, and the quality of photovoltaic modules determines the amount of power generation, which in turn determines the cost of kwh. As the largest proportion of the initial investment, the higher the quality of photovoltaic modules and the longer the service life, the higher the power generation and the lower the cost of kwh

Zhang Juncai, deputy general manager of CPI Huanghe hydropower company, 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 the annual efficiency decay of the system, and advanced materials can improve the efficiency of photovoltaic modules

Zhang Juncai shared with us a set of data of China Power Investment Golmud phase I photovoltaic power plant. This 200MW photovoltaic power plant uses components from six suppliers. After nine months of operation, the company tested all components. The results showed that the component power of the six suppliers was negative deviation, and the maximum average deviation power was -13.63w. The average power loss is 7w/block. The PV modules of these manufacturers have yellowing, cracking, bubbles, delamination and other conditions to varying degrees, indicating that there are problems in the material quality of PV modules, resulting in the power loss of modules. This leads to the reduction of photovoltaic power generation, and the final result is the increase of the actual kwh cost

"according to the average daily utilization hours of Golmud area of 4.3 hours and the comprehensive efficiency of 80% using 1 cubic meter of polyurethane insulation material, the power of a photovoltaic module will be reduced by 7W, which will lead to about 13.5 million kwh less power generation per year for 300MW photovoltaic power stations."

Zhang Juncai believes that in view of the harsh climatic conditions in the west, we must choose high-quality materials, components and systems in the early stage to avoid quality problems, so as to reduce the cost of kWh and improve the return on investment

zhangshengzhong, chief engineer of TBEA new energy division, has a profound view on the quality control of key components in the photovoltaic power station system during model selection, he said, "In the market environment of seeking price competitive advantage by reducing costs, the quality problems of components are also more and more hidden. For example, the strength of aluminum alloy frame material decreases, which directly causes the frame of photovoltaic panel array to fall off or tear when strong winds occur; when EVA adhesive film has a large pressure lifting force, it will age and turn yellow before the density of the material is large, affecting the light transmittance of components, thereby affecting the power generation of photovoltaic power stations; under the sealing performance of junction boxes Drop, leading to oxidation and corrosion of metal live parts in the junction box, and increase of contact resistance, which not only affects the conductivity, but also leads to heating; Due to the defects in the mechanical performance of the modules, the photovoltaic power stations that have been built with double glass thin film modules generally have large-area cracking of the modules affected by temperature, which brings hidden dangers to the operation of the power station, and so on. "

"for investors, the occurrence of these problems will lead to the consequences of power generation damage, increased maintenance, increased operating costs and reduced investment income. Therefore, quality control in the process of component selection is particularly important, and quality is the bottom line that both supply and demand should maintain."

Zheng Xianzhi, President of Greater China of DuPont electronics and communications division, believes that many practitioners use materials that have not been verified by 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 the material is the key. Therefore, only adhering to the use of high-quality, time proven materials is the key to truly ensure the return on investment and the sustainable development of the photovoltaic industry

after more than two years of in-depth adjustment in the photovoltaic industry, we are pleased to see that more and more photovoltaic manufacturers have changed from pursuing speed and scale to pursuing quality. More and more photovoltaic module manufacturers and developers of finished products that can be directly tested have begun to choose high-quality materials to establish long-term competitive advantages. Many downstream power station developers also actively summarize the experience and lessons troubled by quality problems in early investment projects and establish more detailed enterprise technical quality standards to ensure the quality of the project if they choose 110 groups of plastic parts with the dimensional tolerance of this kind of plastic. By standardizing the list of key materials, potential quality problems can be eliminated, so as to greatly reduce the operation and maintenance costs and investment risks for more than 25 years. The pressure of cost can be completely solved through the improvement of component efficiency and the extension of service life

the problem of external distributed generation involves the reform of power system, which is difficult to be fundamentally solved at the moment

China glass () Department

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