UHVDC valve will change the global HVDC transmission equipment market

A few days ago, the National Energy Administration's Department of Energy Conservation and Scientific and Technical Equipment presided over the new product technical appraisal meeting of “±800 kV/4750 ante HVDC valve” independently developed by the China Electric Power Research Institute in Beijing. Representatives from the Ministry of Power, Science and Technology, and the Ministry of Industry and Information Technology of the National Energy Administration attended the meeting. The appraisal committee consisting of 16 experts including Lu Qiang, Yang Qixun, Zheng Jianchao, Cheng Shijie, and Lei Qingquan agreed that the Chinese Academy of Electrical Engineering has mastered the core design, complete set integration, and complete set of experimental technologies for UHV DC converter valves. The developed A5000 ±800 kV/4750 amp HVDC valve module and valve tower have passed the verification of all types of test items stipulated in the IEC60700-1 and GB/T20990.1 standards and have completely independent intellectual property rights. . The product performance is excellent, the overall technical indicators are in the leading position in the world, and the overall technical performance has reached the international advanced level. The design and manufacturing process has realized the flow, standardization and standardization. The manufacturing process, tooling equipment and test capability have met the requirements of large-scale production; With engineering application conditions, it is recommended that large-scale production be carried out as soon as possible.

Independent innovation overcomes world problems

In the large-scale development of renewable energy in China today, HVDC transmission technology is increasingly attracting widespread attention as an indispensable element in building a strong smart grid. At present, 8 DC transmission projects have been built in China. However, DC switching valves, which are the core equipment for DC transmission, have long been dependent on imports and have not truly formed independent research and development capabilities.

The DC converter valve is a high-power electronic device used for AC/DC conversion in DC transmission lines. It is the core technology and equipment for DC transmission projects, and its dependence on imports has seriously hindered DC transmission equipment, especially based on large The further development and application of capacity DC transmission technology in China have made it difficult for China to change from a large DC country to a DC powerhouse.

In 2004, relying on the national "Eleventh Five-Year Plan" technology support plan and the State Grid Corporation of China's major scientific and technological projects, including nine major scientific research projects, the Chinese Academy of Electric Power began an independent R & D based on 6-inch thyristor UHVDC valve. jobs. Based on more than ten years of research on flexible AC transmission technology, China Electric Power Research Institute has focused on less than six years of research. The independent R&D design and construction capability has achieved a voltage rating of ±1000 kV and a 5000 A current-conversion valve. The DC converter valve test facilities for all types of tests and operation tests, and based on this, the electrical characteristics of DC converter valves, multi-physics numerical analysis, complete electrical design technology, complete structure design technology, trigger monitoring technology, and key zero A major breakthrough has been made in the development of components and the integration technology of converter valves, and the development cycle of similar foreign products is usually 10 years. Among them, based on the 6-inch thyristor UHV converter valve package electrical characteristics, UHV converter valve multi-physics numerical analysis, are the first domestic system to overcome.

At present, the key test items for the type test of the converter valve products have all been invited by the international authoritative testing organization KEMA (Dutch Power Test Institute) to be witnessed on the spot according to the IEC60700-1 standard, and on July 30th they passed 7 academicians of the two academies. Witness on the spot. In recent days, it has also successfully obtained a product certification issued by a third-party professional certification body, the Electric Energy (Beijing) Product Certification Center (PCCC), which specializes in electromechanical products for the power industry, laying a good foundation for the product's marketing.

At present, China Electric Power Research Institute has applied for 6 international patents and 200 national patents for UHV valve. Experts of the Chinese Academy of Electric Powers told the reporter that compared with the 5 inch thyristor DC valve commonly used in China, the China Electric Power Research Institute has successfully developed a UHVDC valve with complete independent intellectual property rights, and the flow capability can be more than 3,000 amps. Increased to 4750 amps, the line transmission capacity increased by 150%, and reduce the cost of 25%. It can be said that through independent innovation, China Electric Power Research Institute has fully mastered the core technology and process of R&D of DC converter valves, has completely independent intellectual property rights, and has realized the localization of DC converter valve equipment in the true sense. Following ABB Switzerland and Siemens, Germany, the third company in the world to master and own UHV DC converter valve design, manufacturing and testing technology.

Expected to change the global HVDC transmission equipment market

By 2015, only the State Grid Corporation of China has planned 12 high-voltage/ultra-high-voltage DC transmission projects, and the total investment is expected to be more than 220 billion yuan. Therefore, the industrial application of the ±800 kV/4750 amp HVDC valve products not only satisfies the demand for smart grid construction in China, but also promotes the upgrading of downstream industries such as semiconductors, machinery, and materials, creating significant economic benefits; Break the technological monopoly of foreign enterprises in the major equipment for DC transmission, and realize the transformation of China's major equipment manufacturing industry from "Made in China to China".

“The successful development of the ±800 kV/4750 amp HVDC valve has important strategic significance. He will completely break the monopoly position of foreign companies in the major equipment of HVDC transmission, and at the same time greatly increase the domestic equipment in domestic and foreign markets. Competitiveness can create significant economic benefits for the country. With the help and guidance of academicians, leaders, and experts, we will continue to adhere to independent innovation, give full play to the driving force of the industry, and build green power production chains, power consumption chains, and power cores. The equipment chain has effectively promoted the construction of a strong smart grid, enabling the Chinese Academy of Electric Power to form a truly 'leading core technology, advanced technical standards, and first-rate testing capability' in the field of ultra-high voltage DC converter valves. 'Modern State Grid Corporation provides strong technical support,' said Zhang Wenliang, dean of the China Electric Power Research Institute.

According to him, the next step, China Electric Power Research Institute will give full play to the existing one-year U.S. high-voltage DC converter valve type test capacity that can simultaneously meet the needs of two UHV construction projects, and push forward the UHV DC converter valve. The full-scale industrialization will create a high-tech major power equipment industry with UHV DC converter valve as the core competitive advantage, thereby breaking the monopoly of international multinational companies. It is expected that after the technology is fully put into use, the cost of the construction, operation, and maintenance of China's strong smart grid will exceed RMB 10 billion in the next 10 years alone; and after the product is exported, it will completely change the global HVDC transmission equipment market pattern. Internationally has a major and far-reaching impact.