The 2017 National Science and Technology Progress Awards Special Prize “UHV ±800kV DC Transmission Project†has overcome a series of world-wide problems such as UHV DC external insulation, over-voltage, electromagnetic environment and system control, and created 7 world firsts. It has obtained 114 invention patents and built a complete UHV DC transmission technology system, which has established China's leading position in the field of UHV DC in the world.
China's energy resources and productivity are unevenly distributed, and the “West-to-East Power Transmission†strategy is implemented to accelerate the development and application of DC UHV transmission technology with large transmission capacity and low loss, suitable for long-distance and large-capacity transmission, and to improve the autonomy of China's power transmission and transformation technology. Innovative capabilities are necessary. Recently, the 2017 National Science and Technology Progress Award was awarded the “UHV ±800kV DC Transmission Project†to recognize the outstanding contribution of the project in supporting the country's major strategy.
The ±500 kV DC transmission technology that China has used has to be introduced from abroad and has encountered various technical barriers. From introduction to digestion and absorption, to innovation, China has finally achieved its dominance in the UHV field.
UHV ±800kV DC transmission technology is currently the world's highest voltage level, the largest transmission capacity, the farthest transmission distance, the most advanced transmission technology, is to solve the problem of China's energy and power load reverse distribution, the implementation of the country "West Electric East Send the core technology of the strategy.
If 500kV DC transmission is "electric highway", then UHV is "electric high-speed rail." At the beginning of project research and development, the highest voltage level in China is ±500kV, which should be increased from ±500kV to ±800kV. There is no ready-made equipment, engineering experience and technical standards to follow, and even there is no corresponding test conditions in China. Meet the technical challenges.
For example, the external insulation technology is built by China Southern Power Grid Corporation. The Yunguang UHV is built across the provinces of Guizhou, Guangxi and Guangdong. The length of the line is more than 1,400 kilometers. The ultra-long distance faces complex environments such as high altitude and heavy ice. Conventional insulation materials cannot. Meet the safe operation requirements of UHV DC.
Shu Yinbiao, the third accomplished person of the UHV ±800 kV DC transmission project, and the chairman of the State Grid Corporation, told the Economic Daily that more than 80% of China’s energy is distributed in the western and northern regions, and more than 70% of electricity consumption is concentrated in the east and In the central region, the “West-to-East Power Transmission†strategy will extend the transmission distance from 1000 km to over 2000 km, and it is necessary to build a large-capacity, high-efficiency, long-distance transmission system. The data shows that when the transmission distance is greater than 800 km, it is more economical to use DC transmission. However, the original ±500kV DC transmission technology covers a large area and has a high loss.
Li Lizhen, the first accomplished person of the UHV ±800 kV DC transmission project, and the director of the expert committee of China Southern Power Grid Corporation, said that the ±500 kV DC transmission engineering technology used in China needs to be imported from abroad, and encountered various kinds in practice. Technical barriers, therefore decided to study breakthrough ± 800 kV DC transmission technology to achieve China's real dominance in this field.
"Every time the voltage level rises, it is a breakthrough in technology in the UHV field. From introduction to digestion and absorption, to innovation, China has completely rid of the Western technical blockade and mastered the right to speak in the UHV field." Li Lizhen Say.
2. Overcome many scientific research problemsThe project has overcome a series of problems in equipment development, system control, etc., developed 13 major categories of 73 major electrical equipment, and built a world-leading UHV DC test technology system and experimental research platform.
Relative to communication, DC has the characteristics of large capacity, small footprint, and low loss. The research and development of DC engineering has enormous economic and social benefits. Li Lizhen introduced that through more than 160 units, the project has solved a series of problems such as equipment development and system control. It has developed 13 major categories of 73 major electrical equipments, and has achieved the creation from China to China, providing global energy interconnection. China program.
The project pioneered the 6-inch thyristor radial doping manufacturing process, which overcomes the technical problems of compound electric field calculation, magnetic flux leakage, temperature rise and noise control under the constraints of short-circuit impedance and transportation size, and successfully developed the world's largest flow-through capability for the first time. Flow valve, converter transformer with the highest voltage and maximum capacity, and ultra-high voltage DC complete equipment such as smoothing reactor.
The UHV complex operating environment is difficult to accurately simulate, and higher requirements are imposed on the test equipment and methods constrained by two severe conditions such as UHV and high altitude. The original test sites at home and abroad cannot meet the requirements. The project has built a complete UHV DC test technology system, established a world-leading experimental research platform, built the world's highest experimental voltage engineering laboratory, the highest altitude Tibet high altitude test base in the world and the most advanced in the world. Power System Simulation Center.
The large-capacity UHV DC transmission project is huge in scale, and it is necessary to study and master the complete set of technologies for design, equipment, construction, commissioning, operation and maintenance, and realize the organic unification of safety, reliability and economy. Relying on the research results, the project comprehensively overcomes the system integration problem and builds the world's highest voltage and largest capacity DC transmission project and runs stably for many times.
"Through demonstration projects, the project has created 7 world firsts and obtained 114 invention patents, which has established China's leading position in the world's UHV DC field," Shu Yin said.
3. Targeting the country's major needsChina has built 12 UHV DC transmission projects, accounting for more than 80% of clean energy in annual transportation. It has laid a solid foundation for promoting the transformation of China's western resource advantages into economic advantages and promoting the energy revolution.
“When we study the necessity of this technology, we first aim at the major needs of the country.†Shu Yinyu said that after joint efforts, the project has achieved a series of achievements, and it is important for the “One Belt and One Road†construction and the construction of a clean and efficient energy system. The strategy has played an important role.
China's energy resources and load demand are in a reverse distribution pattern. The large clean energy base in the west is 1000 to 3000 kilometers away from the eastern load center. The breakthrough of UHV DC transmission technology can greatly improve the long-distance and large-scale transmission capacity of the power grid, making it possible to intensive and efficient development of clean energy in the west and large-scale configuration and consumption, to ensure energy Security, promote green development, and promote the eastern and western regions. Coordinated development is of great significance.
China has built 12 UHV DC transmission projects with a total transmission capacity of 93.6 million kilowatts. The annual transportation capacity of clean energy accounts for more than 80%, which is equivalent to reducing the coal consumption of the eastern and central regions by 170 million tons per year and reducing carbon dioxide emissions. 500 million tons. The project has laid a solid foundation for promoting the transformation of China's western resource advantages into economic advantages and promoting the energy revolution.
UHV DC complete sets of equipment also significantly enhance the independent innovation capability and international competitiveness of China's electrical equipment manufacturing. Relying on the mature UHV DC transmission technology, State Grid Corporation successfully won the bid for the first and second phases of the UHV DC transmission of the beautiful mountain hydropower station in Brazil, and realized the general contracting and operation management of UHV transmission technology, standards, equipment and engineering in China. The industrial chain and the full value chain went out and realized economic benefits of 35 billion U.S. dollars.
Shu Yinhao said that based on the UHV DC project, China has led the preparation and release of 6 relevant international standards, and established the world's first UHV DC complete technical standard system. At present, UHV ±800kV DC technology has become an important direction for the development of international energy and power.
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