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Attention to the highlights of UHVDC transmission projects in Northwest Yunnan Your current position：Index > News > Attention to the highlights of UHVDC transmission projects in Northwest Yunnan

Attention to the highlights of UHVDC transmission projects in Northwest Yunnan

Recently, China has been able to build eight units of the General Electricity Regulation Institute, Northeast Institute, Central South Institute, Southwest Institute, North China Institute, Jiangsu Institute, Hunan Institute and Guangdong Institute. Guangdong Thermal Power has participated in the construction of the world's highest elevation UHVDC transmission project with the highest level of earthquake-proof and anti-seismic protection, from Northwest Yunnan to Guangdong Province (+800 KV UHVDC). The transmission project has been put into full operation.

From Xinsong Converter Station in Jianchuan County in the west to Dongfang Converter Station in Baoan District in Shenzhen in the east, the project has a total length of 1956 kilometers and a transmission capacity of 5 million kilowatts. The planned annual transmission capacity is 20 billion kilowatt-hours, which is equivalent to 1/4 of the annual electricity consumption in Shenzhen.

In the process of construction, China can build various units to concentrate superior resources and carry out scientific and technological research. The highlights of technological innovation are frequent and fruitful.

For the first time, the vertical alignment of DC line and grounding pole line with tower erection technology is adopted in UHVDC line. Compared with the horizontal alignment of common tower design, the width of corridor is reduced by about 40 meters, the removal of 60,000 square meters is reduced, the occupation of land resources and the amount of removal are reduced, and the difficulty of agreement is reduced.

For the first time, swallow-wing type crossbars were used in UHVDC transmission lines. After optimization, the distance between conductors was shortened from 28 meters to 22 meters, while the tower weight did not increase, which created good economic and social benefits.

By using Hairawa technology and the latest high-tech means such as high-definition satellite images, aerial photographs, geological remote sensing and GPS, this paper makes a detailed technical and economic comparison between the optimization and partial schemes of the major path scheme, and chooses the best path scheme to reduce the cost of the project.

Negative protection angle design is adopted to reduce lightning trip-out rate. According to the calculation results, the poles and towers of UHV transmission line are designed with negative protection angle, so that the expected lightning trip rate of UHV transmission line is less than 500 KV.

Determine the economic and reasonable tower type planning. Using advanced technologies such as aerial photograph, DEM digital terrain model and transmission line optimization decision software, the tower planning in wind and ice districts is studied by using dynamic programming principle. While ensuring the safety of transmission lines, the project cost is effectively and reasonably controlled.

All-round long and short legs of the tower are used in conjunction with high and low foundations. In the area where the line passes, the terrain is complex, there are many mountains and hills, and the coordinated use of all-round long and short legs of the tower with high and low foundations effectively solves the problem of excessive foundation opening, and achieves the environmental protection purpose of less or no square opening.

Sectional differential configuration to improve insulation level. The number of insulators and the clearance of arc angle are arranged according to different insulation sections. By improving the insulation level of grounding pole line, the insulation flashover problem of grounding pole line can be effectively solved, and the safe and stable operation of grounding pole line and even HVDC transmission system can be guaranteed.

Making special plans to overcome the difficulties of high-difficulty construction technology. The maximum weight of the single-base tower is 306 tons, the maximum height of the tower is 130 meters, the length of the cross-section is about 45 meters, and the maximum weight of the single-section cross-section hoisting is 7.6 tons, which is prominent in the construction of the same type of UHV in the country and requires high construction technology. The project department organizes experts to carry out repeated demonstrations, draw up special construction schemes, and strictly follow the schemes.

China can strictly abide by the scientific and rigorous principle, strengthen the process management, do a good job of pre-guidance, intermediate inspection, finished product proofreading and other links, carry out fine management, to ensure that the project is put into operation on time.