UHV ±800 kV DC transmission project, "going out" bright "Chinese business card"

The UHV ±800 kV DC transmission project completed by the State Grid and China Southern Power Grid Co., Ltd. was awarded the special prize of the 2017 National Science and Technology Progress Award on January 8. This technology is currently the world's most successfully applied power transmission technology with the highest voltage, largest capacity and the longest economic transmission distance.

The first winner of the award-winning project, Li Lizhen, an academician of the Chinese Academy of Engineering, and an electric power expert recently told reporters that in the construction of the “Belt and Road”, the promotion of the technology will be intensified, making it a “going out” of China. business card".

The advantages of ±800 kV DC transmission technology are obvious

China's energy resources and power load distribution are extremely uneven. More than 80% of energy resources are distributed in the west and north, and more than 70% of electricity consumption is concentrated in the east and central regions. The contradiction between energy supply and economic development is outstanding. The development of large-capacity, long-distance, high-efficiency transmission technology is an inevitable choice for the large-scale optimal allocation of China's electric power across regions.

Li Lizhen introduced that in the past, China used the ±500 kV high-voltage direct current transmission technology studied abroad to solve the problem of long-distance transmission. With the development of hydropower such as Xiangjiaba and Xiluodu in the lower reaches of the Jinsha River, nearly 40 million kilowatts of hydropower needs long distance. Efficient delivery.

He believes that the technology of AC transmission scheme is not feasible. The ±500 kV DC transmission scheme covers a large area, has high losses, and is uneconomical. China has proposed the development of UHV ±800 kV DC technology with large transmission capacity, long transmission distance and high transmission efficiency.

The UHV ±800 kV DC transmission project brings significant economic and social benefits. Li Lizhen said that its transmission capacity is two or three times that of ±500 kV DC project, the economic transportation distance is increased to 2-2.5 times, the operational reliability is increased by 8 times, the unit transportation distance loss is reduced by 45%, and the unit capacity line corridor is occupied. The ground reduction is 30%, and the unit capacity cost is reduced by 28%.

UHV DC transmission technology is recognized as the world's leading technology in the world. At present, only China fully grasps this technology and has begun large-scale engineering applications. In 2010, China independently built the Yunnan-Guangdong, Xiangjiaba-Shanghai UHV ±800 kV DC demonstration project. By the end of 2017, a total of 12 UHV DC transmission projects were built nationwide, with an annual transmission capacity of more than 450 billion kWh. Clean energy accounts for more than 80% of the total, which is equivalent to reducing the consumption of standard coal in the central and central regions by 170 million tons per year and reducing carbon dioxide emissions by 450 million tons. It is the main transmission channel for the “Air Pollution Prevention Action Plan”.

Demand for long-distance high-efficiency transmission technology

Rao Hong, chief technical expert of China Southern Power Grid, said that China's per capita electricity consumption has not yet reached the international advanced level. In order to support the substantial increase in per capita electricity consumption, the power grid needs to be developed on a large scale. At the same time, a large amount of renewable energy in China is generated from the west and needs to be transported to the east from a long distance. Therefore, in order to meet the subsequent power consumption in China, it is necessary to make extensive use of UHV DC transmission technology. China is expected to build 20 UHV DC transmission projects around 2030.

The project also has broad application prospects internationally. In Brazil, for example, Brazil's electricity load is relatively concentrated, 80% is distributed in developed areas in the south and southeast, and power transmission in the Amazonian river basin, which is the most abundant in northern Brazil, is difficult. With the expansion of the economy in recent years, the problem of imbalanced power supply has become increasingly prominent.

In 2014 and 2015, State Grid Corporation won the bid for the first phase and the second phase of the ±800 kV UHV DC transmission line project in Brazil. On December 21, 2017, the first phase of the Meishan project was officially put into commercial operation. This was a major breakthrough for China's UHV to go abroad and promoted China-Pakistan comprehensive strategic partnership.

Shu Yinbiao, chairman of the State Grid Corporation of China, said that the Meishan project successfully achieved the goal of “going out” of China's UHV transmission technology, marking that China's UHV transmission technology, specifications and standards have officially entered the global application stage. The successful operation of the Brazilian project proves that China's UHV technology and the “China Program” can effectively solve the current imbalance of power development in Brazil and promote the green development of Brazil's energy economy.

The export of UHV core technology has driven the development of the upstream and downstream industrial chain of power equipment and realized the dual output of technology and equipment. Li Lizhen said that there are also urgent demand for UHV DC transmission technology in countries such as India and South Africa. At present, relevant cooperation is under negotiation; Central Asia is rich in energy resources, and long-distance large-capacity transmission requires UHV DC transmission technology.

Promote UHV technology to become a "Chinese business card"

Li Lizhen, Rao Hong and other respondents believe that our UHV transmission technology has created many records in terms of technical theory, mechanism, engineering construction and equipment manufacturing capabilities. From China's creation to China's leadership, it has occupied the commanding heights of the world's power grid technology. It is recommended to promote the electrical equipment to go abroad, especially the contracting and equipment export of UHV DC transmission projects, like the promotion of high-speed rail and "Hualong No. 1" nuclear power projects.

On the one hand, UHV DC transmission technology, engineering operation design technology and China's large-grid operation technology are transmitted as Chinese business cards. China has a good technical foundation and manufacturing capabilities and design capabilities. In response to the different needs of different countries for transmission technology, China has the ability to provide different solutions. These technical solutions can be carried out to promote China's “going out” products and equipment. Additional value.

On the other hand, continuous investment continues to optimize the state of the art. Rao Hong said that from 2016, China Southern Power Grid will undertake national key R&D projects and independently develop flexible DC transmission technology. At present, the UHV DC transmission project from Yunnan Power Transmission to Guangdong, which is being built by China Southern Power Grid, adopts the traditional DC and flexible DC hybrid mode, which can improve the safety and reliability of the power grid, and is the world's first.

Flexible DC transmission technology is the development direction of the future power grid. Experts suggest that the technology is more demanding in terms of digitization and intelligence. It is hoped that the project will be supported by relevant national departments in terms of project establishment, software and hardware R&D and talent introduction, so that this “China Wisdom” has more room for development.

Recently, the Xingxi 500 kV power transmission and transformation project in Xingtai City, Hebei Province, which was built by the State Grid Xingtai Power Supply Company, is intensifying construction. According to reports, the project is one of the key projects of the National Energy Administration to accelerate the construction of 12 key transmission channels for the prevention and control of air pollution. After the completion of the project, it is of great significance to Xingtai City's economic transformation and upgrading, industrial restructuring, air pollution prevention and improvement of power grid structure. This is the construction of the Xingxi 500 kV transmission substation in the Longquansi Township, Xingtai County, Xingtai City, Hebei Province. Reporter Yang Shizhen

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