Recently, the world's highest altitude, the highest level of earthquake resistance, through the Yunnan, Guizhou, Guangxi, Guangdong provinces, northwest Yunnan to Guangdong ± 800 kV DC project was fully operational. After the project is put into operation, it will not only meet the electricity demand for coordinated economic development in the southern region, but also provide a steady stream of clean electricity for the construction of Guangdong, Hong Kong and Macau.
“Northwest DC Project†is one of the 12 key transmission channels for implementing the State Council’s air pollution prevention action plan, and is the third ±800 kV UHV DC transmission project of China Southern Power Grid Corporation. On December 27 last year, the bipolar low end of the project was put into operation and began to deliver clean water and electricity to the Pearl River Delta load center.
The Northwest UHV DC project starts from Jianchuan County, Dali Prefecture, Yunnan Province, and runs through the silver plateau in the plateau, providing a steady stream of clean electricity for the Guangdong, Hong Kong and Macau regions. In order to find the "leading" of the "Dragon" in the northwestern DC project, the reporter followed the winding S-shaped mountain road in the early summer season, passing through a dense and dense tower, and entering this inlaid mountain. Xinsong Converter Station in the depths. Here is the UHV converter station with the highest altitude and highest seismic level in the world.
2350 meters above sea level
On May 18th, the UHV DC project in Northwest Yunnan was officially put into operation on the morning of the same day. Looking at the large-scale power equipment that shines in the sunlight, Xiao Fagan, secretary of the Party Committee of the Dali Bureau of China Southern Power Grid Super High Voltage Company, has a satisfied smile. “Xinsong Converter Station is the highest altitude ±800 kV UHV converter station in the world. The construction difficulty is self-evident. The project can be put into operation in advance, mainly due to careful planning and reasonable coordination.†Xiao Fagan told reporters As early as 3 years ago, when it was still a wilderness, he had visited the site here. For this project, he is a witness and a builder.
Xiao Fagan told reporters that the site is located at a high altitude, which puts higher requirements on various equipments of the converter station, such as ±800 kV DC wall bushings, high-end converter transformer valve side casings, etc. The equipment must be tailored according to the high altitude of the site. The process is very complicated. It is designed by domestic and foreign experts. Since there is no “manufacturing†general specification, every step is the first step, and every installation is creating experience.
Due to the low temperature in the high altitude area, the maximum temperature of the local summer gas is only 32.7 degrees Celsius. To this end, the external cooling of the converter valve of the Xinsong Converter Station was air cooled and the air cooling tower was creatively built. The air cooling method does not require industrial water, requires low water source, and does not discharge industrial wastewater, saves water resources, and avoids the influence of water mist and sewage on the surrounding environment of the station area. It is also convenient to operate and maintain, and is environmentally friendly. Power grid construction requirements.
One more degree of fortification
Yunnan is on the eastern side of the collision zone between the Indian Ocean plate and the Eurasian plate. It is one of the provinces with the most frequent earthquakes and the most serious earthquake disasters in China. According to the Seismic Safety Evaluation Report of the Engineering Site of the Northwestern to Guangdong UHV DC Transmission Project (Xinsong Converter Station) provided by the Yunnan Earthquake Engineering Investigation Institute, the basic seismic intensity of the station area is 8 degrees. In such a harsh natural environment, what are the special operations of the builders of China Southern Power Grid Corporation, and how can the quality of the project be guaranteed?
The combination of high altitude and high seismic intensity brings great challenges to the construction of the project. The project has encountered many problems in the manufacture and transportation of main equipment, electrical insulation, seismic design, etc., and many problems are “the world's firstâ€, and there is no mature experience. Learn from. To this end, China Southern Power Grid Corporation has carried out a large number of scientific and technological research, which has overcome many world-class problems and provided guarantee for the smooth completion and commissioning of the project.
In this regard, the reporter interviewed Yu Rongxing, the stationmaster of Xinsong Converter Station. When it comes to ensuring the quality of the project in the environment of the earthquake intensity, he has a lot of experience: "The new pine converter station is in the process of construction, according to the magnitude 9 earthquake intensity, although the seismic level is only improved by one degree, but for the design of the equipment. , manufacturing and installation have raised a higher level of requirements."
Yu Rongxing said that first of all, all the equipment of Xinsong Converter Station is installed on the super strong foundation made of 2617 cement piles, and some cement piles reach 30 meters in depth, which is equivalent to installing solid equipment on the ground. "leg". Secondly, all equipment in the converter station is designed according to the 9th-level seismic design. All equipments must undergo simulated seismic experiments before they leave the factory, and then they can be transported to the converter station. Finally, the full decoupling of seismic forces is achieved through the installation method of “Rooker Gangâ€. For example, the valve hall's fittings use a large Z-shaped structure to make it more stable. These measures have a groundbreaking significance in the history of power engineering construction, and provide reference for the future construction of power engineering in the earthquake zone, which has certain demonstration significance.
"After the 90s"
Zhu Dan is one of the only two girls in the Xinsong Converter Station. She is also small and exquisite. She is also a childish young girl, but she has long been a technical expert in the station. She also became a trainee in the past few days. "The project has been successfully put into operation. Can you relax a bit now?" The reporter asked her. However, she replied that as an operation and maintenance staff of a converter station, the nerves at any time are highly nervous, because this is the key to sending the artery to the west.
She told reporters that there are more than 3,000 kinds of equipment in the station. For most of the post-90s employees, it can be said that they are completely strange, and they need to understand and learn from the beginning. In order to shoulder this heavy responsibility, they are not afraid of being tired and tired, using all available time to familiarize themselves with various equipments, and when they are free, they will gather together to discuss various incurable diseases encountered in their work. By the time of commissioning, many people have not returned home for several months. At the Xinsong Converter Station, the “90s†has become the main force in production and operation that can be independent!
The northwestern DC project has a tight schedule and heavy tasks. In particular, the Xinsong Converter Station is a high-earthquake intensity and high-altitude area. The construction is difficult. The UHV company has combined the work with the actual situation of “the branch is built on the stationâ€. The party members' responsibility area was divided, and the party members and comrades took the lead in the front, playing a vanguard and exemplary role, effectively promoting the construction of the project.
"The purpose of this is to let every party let the party members take it. Every corner has party members to guard, so that party members can fully play their central role in production preparation." Liu Keyang, member of the Xinsong Converter Station of the Dali Bureau of the Super High Voltage Company Say. I remember once, during the inspection of the party members, they found a small defect. This defect was caused by the damage of the plugging mud caused by the cable passing through the plugging mud during the installation process. Party members found in the special inspection. This defect was submitted to the construction unit and the construction unit handled it, which perfectly solved the hidden danger caused by this defect.
The dragon is in the wild, starting from the Yunnan-Guizhou Plateau. Time is the scale for marking the pace of progress. In less than two years, the builders of China Southern Power Grid have overcome enormous challenges in the construction process, and have set a number of “world's best†hard bones, the world's first UHV. DC project - Yunnan-Guangdong ±800 kV UHV DC transmission demonstration project shortened by 12 months.
The northwest DC project will be fully operational, adding 5 million kilowatts of power from the west to the east, and reducing the annual hydropower of Yunnan by 20 billion kilowatt hours, which can reduce the consumption of standard coal in the Pearl River Delta by 6 million tons and reduce carbon dioxide emissions by 16 million tons. It is equivalent to planting 16 million hectares of trees.
During the "Thirteenth Five-Year Plan" period, China Southern Power Grid Corporation will also build the world's first UHV multi-terminal hybrid DC project - Kunliulong DC project. By the end of 2020, the southern region's west-to-east power transmission capacity will exceed 55 million kilowatts. It is 16.8% more than the present, further promoting the optimal allocation of resources in the east and the west, and contributing to the development of green and low-carbon economy.
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