"At a meeting, some experts proudly and proudly said that the Prime Minister helped them sell high-speed rails internationally, and finally the high-speed rail sold to Southeast Asia. I told him that this shows that your high-speed rail is not good enough. The HVDC transmission technology has not been sold to the Prime Minister and sold to Brazil. At present, Brazil has built two ±800 kV UHV transmission lines, which are all adopted by China's technology.” Held in Chengdu on June 28th. At the 14th International AC and DC Transmission Conference, the chairman of the current session and Dean of the Energy Internet Research Institute of Tsinghua University had a humorous voice.

Although it sounds like a joke, Zeng Wei said that this can also explain to a certain extent that China has a very high level of direct current transmission technology, especially in the field of UHV DC transmission technology, which has already taken the lead in the world.

“Over the past few years, 100 DC transmission projects have been built in the world, about half of which are in China; currently there are more than 50 DC projects under construction worldwide, of which 70% are in China.” Zeng Zheng said that in the past 10 years, China’s DC transmission technology has developed. The reason why this is so rapid is that China's energy resources and load centers are adversely distributed. China's energy resources are mainly concentrated in the west, north and southwest, but load centers are concentrated in the central and eastern regions, which determines the basic pattern of long-distance energy resources transportation. In recent years, the installed capacity of hydropower, wind power, and photovoltaic power generation in the northwest and southwest regions has increased significantly, which has promoted the development of long-distance and large-capacity HVDC transmission projects.

He further pointed out: "Given the increasing trend of China's electricity demand, I believe there will be more DC transmission lines in the future."

According to him, currently China's terminal energy consumption accounts for only 22% of the total electricity consumption. According to forecasts, by 2030, this proportion will increase to 30%. In other words, this proportion will increase by half in the next 10 years or so. Taking into account the increase in total energy consumption during the period, the corresponding absolute amount of this proportion will increase even more. Therefore, the future development of DC projects is very large.

However, Zeng Jun also said: “At present, although China has obvious advantages in the design and construction of DC projects, there are still gaps in electrical equipment. The core components of many equipment can only rely on imports. For example, some equipment companies have only one year of light import. The core components of the company exceed US$1.5 billion. If localization and autonomy can be achieved, the corresponding costs will be greatly reduced. Therefore, this is also the main direction of China’s DC transmission research.”

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