Time: 2022-12-20 Author: 铧正 Click: 119 Time
China has always been an active participant in the development of UHV technology, and it already has the world’s leading technology level and owns a number of independent intellectual property rights. Many of its UHV standards in China have also been listed as international standards, and China’s power construction is in flexible power transmission. , New energy grid connection, smart grid and other fields are also outstanding, leading the major achievements of the world's grid technology development.
UHV power transmission technology can achieve point-to-point, ultra-long-distance, and large-capacity power transmission capabilities. Especially in our country, where power resources are concentrated, UHV technology is indispensable for the electric power of the Southwest Hydropower Base and Northwest Coal Power Base to cover the whole country and support the developed regions in the central and eastern regions.
In terms of power transmission: transmission line capacity is proportional to voltage, and a 1000kv line is equivalent to the power delivered by 4 to 5 500kv transmission lines. In terms of power grid management: the same power transmission, the fewer the lines, the lower the cost of management and maintenance. In terms of transmission distance: Sometimes there is not enough electricity, but it needs to be sent far enough. UHV can reach up to 1,000 kilometers, while traditional UHV circuits require the construction of a large number of high-voltage power stations, and transmission costs in remote areas are very high. In terms of transmission loss: the loss of traditional lines is about 15 times that of UHV.
At present, China is the only country in the world that has mastered UHV technology and applied it to practice. It can be said that if any country in the world wants to build UHV, it must purchase equipment from China and use the standards set by China. , The Chinese standard is also the only standard in the world.
The unique advantage of UHV technology is the improvement of power transmission capacity, and UHV can be used for long distances. Low-loss, large-capacity transmission of electricity, it is precisely with the leading advantage of UHV technology that China has become the world's largest power generation country, and in 1985, China was only ranked sixth in the world.
Of course, this kind of UHV technology does not mean that only China has the control, and other countries cannot do it. In fact, many developed countries have studied it for many years. However, the investment in an UHV transmission line is not low, and it can easily cost tens of billions. Many developed countries think it is not worth the benefits, so the research ends without a problem.
However, China’s unique geographical distribution and vast land and mountains have given room for UHV development. Two-thirds of my country’s hydropower resources are concentrated in the southwestern region of China, and 80% of wind power and solar energy resources are concentrated in the northwest. The Tibet region, and China’s southeast coast is the most economically developed region and the region with the largest electricity consumption, and the headquarters provinces with the largest population are also in strong demand for electricity. How to solve this resource mismatch?
Obviously UHV is the best solution, so China has achieved the great feat of power transmission from west to east by relying on UHV technology. It does not use coal and water resources in the west to generate electricity on site, and then send the electricity to the central and eastern regions through transmission lines and grids. . Using power transmission instead of coal, UHV has become a convenient channel between resource-rich areas and large power users, and it has also allowed the slightly embarrassing resource distribution and demand to be developed in a balanced manner.
The maturity and successful application of China's UHV technology has also allowed the world to see the unique advantages of UHV technology. Today, China's UHV technology has gone abroad to provide the world with experience and technology that can be used for reference. Chinese engineering companies are also internationally It has undertaken a lot of UHV construction work, and realized the output of China's UHV transmission technology, standards, equipment, general contracting and operation management of the entire industry chain and value chain.