Localization rate of UHV equipment exceeds 90%

The localization rate of AC and DC equipment exceeds 90% After ten years of efforts, China has fully mastered the UHV core technology and has broken the long-term monopoly of multinational corporations in the international market.

The localization rate of AC and DC equipment exceeds 90%

After 10 years of hard work, China has fully mastered the UHV core technology and broke the long-term monopoly of the multinational companies in the "1000-V" "Huainan-Nanjing-Shanghai" UHV AC project and obtained approval from the National Development and Reform Commission. Layers of waves make the capital market happy. On May 14, the UHV stocks in the two cities rose.

Not only that, but a widely-circulated power grid investment plan developed by the Power Planning and Design Institute shows that, in addition to the aforementioned lines, China will soon approve the construction of 12 transmission channels that run through the eastern and western parts of China, involving a total investment of over 200 billion yuan. yuan.

For many years, around the construction of UHV, the industry has always been arguing constantly. Nowadays, the ever-increasing pressures of haze management, environmental governance, and energy-saving and emission reduction have made China resolve to strive to optimize the allocation of resources and reduce energy waste through UHV transmission. Reducing the pressure of channel construction, but also reducing other energy sources, such as the consumption of energy such as oil.

On May 14, Wu Zhonghu, deputy director of the Energy Economics Committee of the China Energy Research Association, who was interviewed by the reporter, said that “to address the uneven distribution of resources in China, to reduce the environmental pollution in China’s major power consumer regions, and to increase transmission capacity It is the only way to go. At the same time, ultra-high pressure and ultra high voltage will also play a catalytic role in the application of renewable energy such as photovoltaic and wind power."

Can't just look at one-time investment

In fact, with the UHV has been included in the national "Eleventh Five-Year" and "Twelfth Five-Year" plan, air pollution prevention action plan, energy development "Twelfth Five-Year Plan", etc., the development of UHV has been widely recognized.

It is understood that among the 12 cross-regional power transmission channels planned and constructed by the National Energy Administration this time, there are 4 UHV AC lines and 4 UHV DC lines of the State Grid Corporation of China, namely Ximeng-Shandong, Yiheng-Shandong, Huanan-Nanjing-Shanghai, Mengxi-Tianjin four 1000 kV AC UHV lines, and four ±800 kV UHV DC lines in Shanghai Miao-Shandong, Ximen-Jiangsu, Ningdong-Zhejiang, and Shanxi-Jiangsu in Inner Mongolia, In the future, optimizing the allocation of energy resources and controlling haze will play an important role.

In addition to this, one of the pros and cons of the U.S.-backed forces over the years has been their economic and security risks. In response, Wu Zhonghu told reporters: “The transmission cost of UHV is certainly high, but we cannot just look at one-time investment, but we should also calculate the cost of electricity in light of actual conditions. Colleagues have large transmission distances and distances. The advantages of high efficiency, low loss, and small footprint should also be fully considered."

At present, China's "two-transit and three-straight" UHV projects have been put into operation for long-term and safe operation, with cumulative transmission of more than 160 billion kwh. In the five years since the operation of the Jindongnan-Jingmen UHV AC pilot demonstration project, two-way, full-voltage, and large-capacity transmissions have been achieved. They have been subjected to thundery weather, high winds, high temperatures, and severe cold and other severe weather tests. As of March this year, the cumulative power transmission exceeded 58.3 billion. Kilowatt-hours has become an important energy transmission channel in the north-south direction of China. The three UHV DC projects in Xiangjiaba-Shanghai, Jinping-Suanna, and Hami South-Zhengzhou transport large-scale hydropower, thermal power, and wind power in Sichuan, Xinjiang Autonomous Region and other regions to the East Central Load Center until the end of March this year. Accumulative transmission of 94 billion kwh of electricity has played an irreplaceable role in the development and utilization of clean energy.

It can be seen that the UHV has passed a scientific and rigorous argument. There have been media briefings. Over the years, UHV and State Grid Corporation jointly organized over 10 industry organizations and consulting agencies, 8 universities and colleges, more than 100 engineering design and equipment manufacturing units, and organized more than 30 academicians, professors and engineers. More than 3,000 technical personnel, held more than 300 important thematic demonstrations, in-depth demonstration of UHV power grid security, economy, and feasibility. The National Development and Reform Commission and the Energy Bureau organized several large-scale argumentations and discussions and commissioned five units of the Chinese Academy of Engineering, the Chinese Academy of Sciences, the China Electricity Regulatory Commission, the China Electricity Council and China Machine Link to conduct independent arguments and both clearly stated their supportive opinions.

Our country fully grasps UHV core technology

On the technical side, Wu Zhonghu firmly believes that China’s UHV has reached the world’s leading level.

After 10 years of hard work, China has fully 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.

Take the example of China's UHV Mountain, Jindongnan-Nanyang-Jingmen 1000kV UHV AC pilot demonstration project as an example. It is independently researched, designed and constructed by China, and has completely independent intellectual property rights. The foundation of the project was laid in August 2006. At 22:00 on January 6, 2009, the Jindongnan-Nanyang-Jingmen 1000 kV UHV AC pilot demonstration project successfully passed the 168-hour trial operation assessment and was formally put into operation. This indicates that China has made major breakthroughs in the localization of UHV power transmission and transformation core technologies and equipment.

In addition, such as Xiangjiaba-Shanghai ± 800 kV UHVDC transmission demonstration project is the world's largest transmission capacity, the longest distance, the most advanced technology, the highest voltage level of the DC transmission project, its transmission capacity reached 7 million The kilowatt-level can deliver 35 billion kilowatt-hours of clean hydropower to Shanghai each year, which is equivalent to 30% of Shanghai's annual electricity consumption.

According to public information, over the years, the State Grid Corporation has reported 679 UHV patents, and 379 of them have been authorized; the UHV AC test base, DC test base, high altitude test base, engineering mechanics test base, and large power grid simulation have been built. The DC Complete Design R&D Center has formed a large-scale grid experimental research system with complete functions and comprehensive indicators ranking the world's leading level; China has mastered the core technology of UHV equipment manufacturing and successfully developed the UHV AC full set of equipment and DC that represent the highest level in the world. The key equipment has created a number of world records and formed mass production capacity, which has promoted China's electrical equipment manufacturing industry into the international advanced ranks.

At the same time, UHV technology moves from testing to mature applications, and promotes the standardization work to make new progress. At present, 16 (amendment 1) UHV AC national standards, 1 industry standard, and 73 enterprise standards have been issued, and the UHV AC pilot demonstration project has won the title of “National Major Project Standardization Demonstration”. Not long ago, the "Key Technology for UHV AC Transmission, Complete Equipment, and Engineering Applications" won the National Science and Technology Progress Award Special Award.