The application of UHV power transmission and transformation technology to establish UHV network can further improve the safety, reliability and economy of the power grid; the application of UHV power transmission and transformation technology can completely solve the problem of power network security caused by weak cross-regional connection of the power grid, and provide strong power network support for production and construction in eastern China; the application of UHV power transmission and transformation technology can solve the problem of short-circuit current exceeding the limit of the power grid in high-load areas, reduce the number of corridor loops and save land resources. Calculations and practical applications have proved that the ± 800 kV DC transmission line is significantly less than the ± 600 kV DC transmission line, which can save the transmission channel area of 300 k㎡. When transmitting 100 000 kW of electric energy and the transmission distance is 800 km, it takes 8 to 10 times to use the 500 kV AC line, while it only takes 2 times to use the UHV transmission network, which can shorten the transmission channel width by 0.3 km and save the transmission channel area of 240 k㎡, which has obvious economic advantages.
The application of UHV power transmission and transformation technology and UHV power grid can help to build a large-scale network across regions, realize peak staggering, peak shaving, water and fire reciprocity, and reduce power grid losses; the application of UHV power transmission and transformation technology can also reduce the pressure of coal transportation and promote the intensive utilization of coal. At present, there are certain structural contradictions in my country's energy distribution. The energy resources in the central and western regions are relatively abundant, and the energy consumption in the eastern coastal areas is large, and there is an energy shortage problem. The application of UHV power transmission and transformation technology will help the west-east power transmission, which can enable the western region to give full play to its own resource advantages, reduce the energy pressure in the central and eastern regions, and promote the coordinated development of the regional economy and society.
In the research of UHV power transmission and transformation technology system, China completed the development of the world's largest AC power transmission and transformation project during the "Twelfth Five-Year Plan" period. The advent of this project not only solves the technical difficulties in the planning and operation of the power system, but also ensures the real-time stability of the high-voltage power system. In addition, the UHV system is closely related to the networked network, and the research on UHVDC transmission technology can create good conditions for the safe operation of the power network, improve the level of emergency response support of the power system, and optimize quotas.
Author: 崔 斌 国网张掖供电公司，甘肃 张掖 734000