Recently, the news that "China's UHV technology first went abroad" has shaken the industry and attracted the world's attention. It said that the joint venture between China State Grid Corporation and the Brazilian Power Company successfully won the bid on February 7 this year Three major hydropower stations - Brazil's Merits Hill HVDC UHVDC project, which is the State Grid Corporation of the successful bidder in the first UHV DC transmission project. After reading the above information, I can not help but give birth to many feelings. We know that China's energy resources and demand are adversely distributed. More than 70% of energy demand is concentrated in the central and eastern regions. 76% of coal is concentrated in the north and northwest, and 80% of water resources are concentrated in the southwest. Land wind and solar energy Other new energy sources are also widely distributed in the northwest. A 1000 kV UHV AC transmission line transmission power of nearly 5 million kilowatts, about 4-5 times the 500 kV line; plus or minus 800 kV DC UHV transmission capacity up to 6.4 million kilowatts, plus or minus 500 kV More than twice the DC line. With the same transmission power, the UHV AC line can extend the furthest distance 3 times, and the loss is only 25% -40% of the 500 kV line. Compared with the 500 kV line, it can also save 60% Land resources. Therefore, the development of UHV electricity, the "expressway", has become a unique choice for our country. UHV, a project that represents the direction in which the international transmission technology advances, must face up to the challenge. To develop UHV needs to innovate independently on the basis of existing technologies and industries, it has taken the lead in overcoming the world's new transmission line with a new voltage level Need a full set of technology, and based on domestic, in the world for the first time to develop a full set of UHV equipment. After that, it comprehensively tackled outstanding problems such as voltage control, external insulation configuration, electromagnetic environment control and development of four major equipment. At the technical level, the three UHV projects that have been completed so far have created "the best of the world" in terms of technology, equipment manufacturing and engineering construction, and I am afraid that it will be hard for even the industry to fully utilize it. EHV transmission has proven to be safe and cost-effective. In the international market, the influence of UHV's "lead" status is especially evident. Brazil's beautiful landscape water and electricity sent engineering decision-making, initially considered, including DC, AC and a "half-wave power transmission" technology route, with a variety of different voltage levels, a total of 13 kinds of power transmission. Since 2010, the State Grid has repeatedly interacted with the Brazilian industry and government departments and finally "has become a program of ± 800 kV UHVDC proposed by State Grid from 13 types of programs." Behind the successful interaction is the Xiangjiaba - Shanghai (upward) project, which was completed and put into operation in the same year. It has set an example in the world of low unit cost, low loss and reliable operation. Even more pride is that State Grid has won the dominance of 20 international standards. The International Big Power Grid Commission and Institute of Electronics and Electronic Engineers set up eight working groups led by Chinese experts and are leading the preparation of relevant international standards. Visible, from "Made in China" to "Created in China" is a qualitative improvement, from "China's creation" to "China's leading" is a revolutionary leap. So far, the world recognizes China as the "leader" in all aspects of the industry and has only the UHV. Therefore, it is applauded by the utmost pressure to hold the pride of China's State Power Grid Corporation.
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