China's largest coal mining subsidence area photovoltaic base connected to the grid to generate electricity

On November 5, after 14 months of construction, the largest domestic single photovoltaic base project in the coal mining subsidence area, with an installed capacity of 3 million kilowatts of the National Energy Group Guodian Power Mengxi Blue Sea photovoltaic power plant in the Inner Mongolia Ertuoqian Banner connected to the grid.

With a total investment of about 12 billion RMB, Mengxi Blue Sea Photovoltaic Power Station is a key supporting project of the national “West-East Electricity Transmission, West Development” Inner Mongolia Ordos Shanghai Temple to Shandong Linyi ±800kV UHV DC Transmission Project. The project is located in Ertokqian Banner of Ordos City, Inner Mongolia, covering an area of about 105,000 mu, equivalent to 10,000 standard soccer fields, and laying more than 5.9 million photovoltaic modules. After the power station is connected to the grid, it is expected that the annual power generation will reach 5.7 billion kilowatt-hours, and the green power will be sent across thousands of miles to be consumed in Shandong, which can satisfy the living power consumption of 2 million residents for one year, and provide a strong green energy guarantee for the economic and social development of the eastern coastal region, and the social, environmental and economic benefits are very significant.

During the construction period of the project, Guodian Power puts forward the top-level idea of “fire and light bundling, joint delivery, comprehensive demonstration and technology leadership”, and takes “highlighting scientific and technological innovation, enhancing the content of science and technology, and striving to create the National Quality Engineering Gold Medal” as the goal, and adheres to the top-level design, Planning as a whole. The project construction unit Guodian Power Inner Mongolia comprehensive energy from the survey, design, construction, operation, maintenance of multiple links to achieve ecological priority, industry-driven, multiple benefits, green and low-carbon, safe and stable, the first large-scale application of photovoltaic panels and brackets in the international “integrated” fusion of mounting program, through the “integrated” module, the “integrated” module, and the “integrated” module. It is the first large-scale application of the “integrated” fusion installation program of photovoltaic panels and racking in the world, and realizes the construction of photovoltaic arrays through “integrated” component on-site pre-installation and “integrated” component construction, realizing the construction of photovoltaic arrays with fewer manpower, mechanization, and high efficiency, and improving the construction efficiency by 25%, and forming the distinctive features of “five new applications, five demonstrations and eight optimizations”. It has formed the distinctive features of “five new applications, five demonstrations and eight optimizations”, which has accumulated valuable experience for the construction of large-scale photovoltaic projects in China's sandy and barren areas.

Inner Mongolia Comprehensive Energy has built the first large-scale PV outdoor demonstration base in China's “Shagoe Wasteland” climate zone at the project site, verifying the combination of different modules, inverters, stents, etc., and forming more than 30 types of demonstration programs, exploring the most suitable effective path for large-scale development of PV in the “Shagoe Wasteland” region. Exploring the most suitable path for large-scale development of photovoltaic in the “sandy desert” area. It is the first large-scale application of new rare earth alloy grounding material in China, which adopts mechanical connection without welding, eliminating fire hazards and greatly improving construction speed, saving comprehensive costs by 40%; the application of N-type PV modules with the highest construction power of 2.5 million kilowatts during the same period of time in China, which reduces the attenuation of the whole life cycle and improves power generation by 2%, which is an important demonstration significance for the development of the next-generation crystalline silicon cells; it is the first time in China to apply the highest power of PV modules in the same period of time. With important demonstration significance; in the country for the first time large-scale application of H-type square steel piling, piling does not need to lead holes, welding, can avoid the operation of the grassland fire risk, and effectively achieve the construction of large projects to drive scientific and technological innovation and upgrading of industrial equipment to fill the National Energy Group and Inner Mongolia region PV evidence base blank, for the development of the photovoltaic industry and the development of related policies to provide references.

At the same time, the power station closely rely on Inner Mongolia's good renewable energy resources and location development advantages, combined with the comprehensive treatment planning of coal mining subsidence areas, to create “PV + ecological” scenarios of “under-board planting, agriculture and light complementary, pastoral and light complementary, industrial tourism” in the ground surface. In the area with more native vegetation, alfalfa and sardonyx are planted, and in the area with less native vegetation, grass mignonette, sandy cypress and Artemisia seeds with better drought tolerance are planted to provide excellent fodder for the cows and sheep and realize the sustainable development mode. The sand-resistant plant lemon grass planted under the board can be used in thermal power plants for biomass blending, reducing the proportion of fossil fuels used for power generation, achieving the purpose of carbon reduction and pollution reduction, and developing new quality productivity according to local conditions while promoting “agriculture and light complementarity”.