"Rouzhi" out of the sea

If you ask someone casually, do you know Ru Dong? Presumably, most people don't know this small county in Jiangsu, but if you ask a wind power person, he will probably blurt out: "Know, there is a soft -winding electric field over there, which is particularly famous."

The word "Rouzhi" has now become the "golden signboard" of Rudong County.

"Since it was officially launched in December 2021, the Three Gorges such as the East China Sea Wind Power Farm has operated well and stable." Said Zhang Xinsheng, the three Gorges Energy Jiangsu operation and maintenance company Rudong Project Department.

"Run well and stable status." In just eight words, it contains the efforts of upstream and downstream companies in nearly a hundred offshore wind power industry chains in my country.

▲ In July 2021, the Three Gorges Rudong Streaming Station is preparing to install the Three Gorges Energy Confer

One stream station

Sea -changing stations are the key core equipment for the flexible DC transmission of wind power at sea. Prior to the Rudong project, China had no experience in manufacturing the sea -changing station at the sea. In addition, foreign core technologies were not open to China.

"We investigated the current streaming station in the sea at that time. When we visited, the other party did not allow any photography and communication equipment such as mobile phones, and we could only watch it with our eyes." He Junsheng, the project management department of the Three Gorges Energy Jiangsu Division Nantong Company, recalled.

What exactly is soft straight technology? Simply put, the power grid achieves stable operation. It is important to control the two indicators of voltage and frequency. They are equivalent to a person's blood pressure and heart rate. The flexible DC not only conveys the power, but also regulates the voltage. Its application is like a person with a strong heart and blood vessels, which can control heart rate and blood pressure well.

"Flexible DC transmission technology is the world's most cutting -edge transmission technology and a power grid -friendly technology. It is the main direction of the development of offshore wind power in the future." Wu Wei, deputy director of the Ministry of Construction of the State Grid Jiangsu Power Company, told reporters.

Can you only look at it with your eyes? It doesn't matter, then study it yourself; encounter foreign technical barriers? It's okay, then make it yourself.

"In the end, the Three Gorges Group led, combined with upstream and downstream enterprises, overcome difficulties, and finally broke through the key technologies of Rouzhi, and created this sea -changing station at sea." Said Yuan Yingping, chairman of the Jiangsu Group Jiangsu Branch.

Entering Zhenhua Heavy Industry is located in Nantong's manufacturing base, and I saw a huge factory with tens of meters tidy in the river. The factory building was flexibly operated in the factory. It is manufacturing a variety of heavy maritime equipment. Zhenhua Heavy Industry's focus is to manufacture heavy equipment, and the core product is the port crane. "Rudo's sea -changing station at the Eastern Project was originally made here, gone into the river, entered the sea from the river, and finally stood in the Huangsha Ocean Sea." Li Shuqing, the person in charge of the production and control of Zhenhua Heavy Industries, pointed at the demo chart of the stream station.

"The Three Gorges, such as the East China Sea, weighing 22,000 tons. Prior to this, Zhenhua has never created such a big guy." Li Shuqing told reporters.

The Three Gorges, such as the East China Sea, is currently the world's largest capacity and the highest voltage level in the world. For the successful manufacturing of this stream station, the Three Gorges Group jointly made exclusive customization in design, manufacturing, transportation, and installation.

In the design session, because the weight of the East China Sea changing stations is 4-6 times that of the average maritime rising station, the conventional integrated catheter rack is not suitable for this behemoth. To this end, Zhenhua has specially used the construction process of the split duct. The "base" of the stream station is divided into two, and the layout is reasonable; in the transportation link, the stream of the stream of stations adopts a sliding rail transportation method from Lu Jinjiang to set up a track from the manufacturing base to the side of the river. The stream station slides into the river, and finally enter the sea from the river; in the installation session, the floating support installation method is adopted, and the flowing station is combined with the catheter rack like a "building blocks", and the spelling error is controlled to the millimeter level.

"The Three Gorges Streaming Station is a concentrated embodiment of China's heavy maritime equipment design, transportation, manufacturing, and installation capacity. Innovation in this project is of great significance to the manufacturing and installation of China's future maritime equipment." Li Shuqing said Essence

Zhongtian Science and Technology Water Cable Production Line Photography: Tang Wei

One seaside

Looking at the distance, the height is about equal to the stations of the 15 -story residential building standing steadily on the sea, highlighting the strong existence to the past ships, and on the bottom of the sea, a sea cable is buried under the muddy sea bed, and the transmission of power is silently fulfilled. mission.

Prior to this, the internationally widely used sea transmission cables were basically ± 320kV levels, and ± 400kV flexible DC sea cables. They have not done it in China. To successfully make this cable, some technical bottlenecks and core indicators must be overcome.

Taking the operation overvoltage as an example, it is one of the key core parameters in the entire stream -changing station system. The operating voltage level of the Jiangsu Rugao East China Wind Power Project has reached 1235kV, and it is even higher than the over -voltage of the cable operation of the ± 500kV level abroad. Level, how to overcome this core parameter is a problem.

"After understanding this situation, we took the initiative to find a way to help the Zhongtian Technology of the East Project Sea Cable to overcome this problem." Yuan Yingping said.

In the process, the Three Gorges Group first organized industry experts to guide the design of school nuclear, and then organized scientific and technological projects within the group to specialize in technical difficulties in seal cables.

"With the help of the Three Gorges Group, we captured the parameter of the operation over voltage, and then conducted a trial and trial system for the soft -straight cable. After many reliability verification tests, this ± 400kV flexible DC flow was finally made. Cable. "Zhang Hongliang, director of the Zhongtian Science and Technology Substitute Institute, pointed to the soft sea cable that was obviously smaller than other cables in the exhibition hall. This cable is not only the first ± 400kV DC cable that Chinese companies have independently developed and manufactured, but also the highest -level flexible DC transmission cable in China.

During the process of "0" to "1", the Zhongtian Sea Cable has also precipitated many technical experience. According to relevant statistics, Zhongtian Technology has applied for more than 50 patents on this soft -straight cable, nearly 10 core patents authorized, and published nearly 20 papers in SCI and EI. A high -voltage DC submarine cable national standard.

"With this ± 400kV seaside cable, the core manufacturing technology of the Rouzhi Sea cable firmly in his hands." Zhang Hongliang said.

Three Gorges Ru Donglu State Station Photography: Tang Wei

A county

Ruodong County, Jiangsu Province, a county in the sea, because of the word "Rouzhi", is well -known in the wind power industry. For example, in the East Land Flowing Station, the people who came to visit were staring at various indicators on the central control screen to understand the operation of the Rudong project.

Jiangsu Rusong County is the first county in the country to carry out maritime wind power planning. It is the first batch of green energy demonstration counties in China. It is also the first maritime wind power project in Asia to use flexible DC transmission technology. The rapid development of the industry has also brought some changes to the local area.

Driving into Rudong County, as long as tens of meters, the "retirement" fan blades used for decorative arts quickly passed on both sides of the road. Under the blue sky and white clouds, no matter which direction, you can see a typhoon rotating. It can be said that in the east, wind power elements can be seen everywhere.

Ten years ago, Rudong was still a small county town mainly based on traditional manufacturing. Chemical, food, agriculture, textiles, and traditional machinery were the main industries in the local area. The local industrial structure of the East has changed.

Data show that as of now, the top 5 maritime wind power host brands in the country have settled in 3 in Rudong, involving the number of enterprises with the wind power industry as the main body, such as Dongdong has exceeded 70.

"After years of development, such as East has formed a full industry chain integrating manufacturing, construction, operation and maintenance, and inspection." Said Zhang Jun, deputy director of the Development and Reform Commission of Dongxian County.

Not just the industrial structure, such as new changes in the entire society of Dongxian County. After the development of the offshore wind power industry, fishermen can obtain relevant certificates to enter the field of operation and maintenance ships to increase income. The development of the wind power industry also brought high -precision professional and technical talents to Rudong, injecting fresh blood into the development of Ru Dong.

"For a long time, Rugong has vigorously developed the offshore wind power industry. Our current goal is to realize the transformation from the first county wind power county to the National Green Energy Demonstration City." Zhang Jun said.

For example

To the farce of the sea

As a major among the offshore wind power industry, such as the East China Sea Sanrador Project is showing the new achievements of China's offshore wind power development to the world. From the perspective of development, this project also contains more profound significance.

my country's "Fourteenth Five -Year Plan" renewable energy planning pointed out that it is necessary to carry out far -reaching wind power planning, and strive to strive to have good resources and construction conditions in Guangdong, Guangxi, Fujian, Shandong, Jiangsu, Zhejiang, and Shanghai. A group of millions of kilowatt -level deep sea offshore wind power demonstration projects started construction. However, there are two rushes that cannot be bypassed at the farce of the sea, which are large -scale and long -distance transmission.

Flexible DC seems to have the potential to change all of this. Compared with traditional transmission technology, flexible DC transmission has strong technical advantages in terms of power supply and large -scale wind field grid grids. In addition, soft -direct technology can also effectively solve the problem of long -distance transmission loss at sea.

For example, the winding field of the East China Sea is about 50-60 kilometers away from the East China Sea. It is just stuck between the sea and the offshore. The use of domestic and straight technology here is undoubtedly based on long-term development considerations.

"For example, the East China Sea Rouzhi project is more like a military training ground and a test field, which allows various new technologies to have a place of use to lay the foundation for China's maritime wind power to the farce of the sea." Yuan Yingping said.

Above the sea of ​​blue sea, the "sea banner" is flying in the wind, showing the ambition of China's marine resources development strategy.

Video/Snapshot, T_100, F_JPG, M_fast "Controls =" Controls "data-version/ueditor/video/mp4/20220927/1664260748825356.mp4 "transcoding =" 1 "style =" width: 400px; "> ▲ Video production: Tang Wei Yuan Xiangnan South

Author of this article: Wang Lei Yuan Xiangnan

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