9 UHV lines open

Recently, this newspaper learned from reliable sources that a power grid investment plan formulated by the Power Planning and Design Institute has passed the assessment of China International Engineering Consulting Corporation and is expected to be quickly approved by the National Energy Administration and other competent authorities.

It is reported that this plan was formulated to implement the “Air Pollution Prevention and Control Action Plan” promulgated by the State Council last year. It will clearly establish 12 transmission channels, including 9 UHV AC/DC transmission projects (including 4 UHV AC projects of the State Grid Corporation of China). 4 UHV DC projects and one UHV DC project of China Southern Power Grid Corporation).

The U.S. UHV Project It is understood that among the 12 cross-regional transmission channels involved in the above-mentioned grid investment plan, there are 4 UHV AC lines and 4 UHV DC lines of the State Grid Corporation of China, which are Ximeng-Shandong and Yuheng. - Shandong, Huainan - Nanjing - Shanghai, Mengxi - Tianjin 4 1000 kV AC UHV lines, and Inner Mongolia Shanghai Temple - Shandong, Ximeng - Jiangsu, Ningdong - Zhejiang, Shanxi - Jiangsu 4 ± 800 kV UHV DC lines will play an important role in optimizing the allocation of energy resources and controlling haze in the future.

Once the “Six Cross and Four Straight” project was approved, State Grid Corporation could immediately carry out the preliminary work and advance the project construction in an orderly manner. Among them, the Huainan-Nanjing-Shanghai line has been approved for construction not long ago.

There are two projects that start from the Ximeng region in Inner Mongolia. The Ximeng region is rich in coal and wind energy resources and is suitable for on-site development and transformation into electricity transmission. According to the plan, through the construction of the Ximeng-Shandong UHV AC transmission line project, an additional 3 million kilowatts of electricity can be transmitted to Beijing, Tianjin and Hebei, and 6 million kilowatts of electricity can be added to Shandong. After the completion of the project, the consumption of coal and electricity in the Beijing-Tianjin-Helu area will be reduced by 14.85 million tons of standard coal per year, equivalent to 20.79 million tons of coal per year, and carbon dioxide emission reductions of 36.38 million tons per year.

In addition, the program also involves an ultra-high voltage DC line in the South Network operating area, namely Lijiang-Shenzhen ± 800 kV UHVDC line. According to public information, this is a major West-to-East power transmission line constructed by South China Network and the third UHV DC line constructed by China Southern Power Grid, involving a total investment of 17 billion yuan.

UHV AC is conditionally released It is worth noting that the program involves 4 of the UHV lines, 4 of which are UHV AC projects, which to a certain extent indicate that the controversial UHV AC transmission technology has been released for many years. .

From this point of view, an informed person does not agree. In his opinion, the energy issue has to give way to the environment, and finally the authorities such as the Energy Bureau have been forced to a dead end, so they have to approve a batch of exchanges of UHV projects, but this does not mean that the competent authorities fully recognize UHV.

Analyzing these 12 channels of governance, the reporter found some clues. Among these lines, cross-regional direct current UHV technology is used, and AC UHV is all confined to the region, such as North China and East China.

"This in itself constitutes an attitude that the exchange of UHV in the region can be approved, but U.S.-funded U.S.-funded projects can only be approved to use direct current," said a person in charge of energy planning at the National Energy Administration.

In fact, no matter whether it is UHV AC technology or UHV DC technology, our country has fully qualified for large-scale construction.

At present, China's first UHV AC pilot demonstration project and DC transmission demonstration project have been safely operated for more than five years and three and a half years respectively. The cumulative power transmission of the “two-transit, three-straight” UHV projects completed by the State Grid Corporation has exceeded 160 billion kilowatt-hours, which has effectively supported the economic and social development of the eastern and central regions.

In addition, after ten years of hard work, China has comprehensively mastered the UHV core technology, and the localization rate of UHV AC/DC equipment exceeds 90%, breaking the long-term monopoly of multinational companies in the international market. The UHV AC voltage has become an international standard, and the DC project has achieved “going out”. The International Electrotechnical Commission (IEC) has four special committee secretariats located at the State Grid Corporation, which has significantly improved China’s discourse power in the field of world power grid standards. Influence.