The grid will accelerate the transition to the third generation

The grid will accelerate the transition to the third generation “The new energy revolution has prompted changes in the mission of the power grid, such as the availability of new energy power transmission and distribution networks, comprehensive energy and power information service systems, flexible and efficient energy networks, and safe and reliable power supply systems. The development and construction of the third-generation power grid.” Zhou Xiaoxin, an academician of the Chinese Academy of Sciences, pointed out at the 3rd Forum of Chinese Electric Power Development and Technological Innovation Academicians held recently that “characterized by sustainability and intelligence, With the depletion of fossil fuels and the real threat of global climate change and environmental deterioration, a new energy revolution is quietly rising worldwide. The clean energy and certain degree of decentralization of energy generated by the energy revolution, and the development of information technology Two major factors, such as intelligence, have prompted the transformation of the power grid.As far as China is concerned, the development of energy and electricity is also facing unprecedented opportunities for development and transformation challenges, such as renewable energy, nuclear energy, natural gas and other clean energy generation, and coal-fired electricity. Together will gradually become the main power source; to clean up (receiving large-scale renewable Source of power) and the main features of the next generation of intelligent power grid will become a trend and direction of future development of the grid.

“The first half of the 20th century belongs to the first generation of power grids, characterized by small units, low voltage, and small power grids. It is the rising stage of power grid development; the second half of the 20th century belongs to the second generation of power grids, and its large units, ultra-high The characteristics of voltage and interconnected power grids indicate that the grid has entered a stage of large-scale development.” Zhou Xiaoxin introduced: “The third generation of power grids that started from the beginning of this century and envisaged to be realized worldwide in 2050 accounted for a large proportion of clean energy power generation. The main features of share and intelligence are sustainable development and smart grid models."

China will develop the model combining the national backbone transmission grid with local transmission and distribution networks and microgrids. ”

Smart grid is the means of realization of the third generation grid

From this we can see that cleanliness, sustainability, and intelligence are the most essential features of the third-generation grid. Such as clean energy power generation will account for a large share, large-scale backbone power supply and distributed power supply combined; national backbone power transmission network and local power grid, micro-grid coordinated development; the use of large-capacity, low-loss, environmentally friendly transmission methods (UHV overhead Power transmission, superconducting cable transmission, gas-insulated pipeline transmission, etc.; intelligent grid dispatch, control and protection; two-way interactive intelligent power distribution system...

Then, what is the relationship between the third-generation power grid and China's strong smart grid planning? Zhou Xiaoxin said: "The smart grid highlights the characteristics of intelligence, including the characteristics of supporting the large-scale development of renewable energy, emphasizing the intelligent improvement The key supporting role of grid performance and grid technology level can better summarize the mission and characteristics of the third generation grid. Therefore, the in-depth research and active implementation of the smart grid is to promote the transition from the second generation grid to the third generation grid. Important means and strategic measures.

Need to overcome a series of grid key technologies
"The power grid as a carrier of the electricity market is a support for energy security. It plays an integral role in the promotion of market systems and competition mechanisms when the government fails in the market." Xie Kechang, vice president of the Chinese Academy of Engineering pointed out: "21st Century Energy Safety will be based on all-round energy security, and China should seize the opportunity to lead the construction of a comprehensive energy security system based on electricity."

At the same time, the realization of the transition from the second-generation power grid to the third-generation power grid also needs to overcome a series of technical problems, such as the large-scale new energy and renewable energy-friendly access technologies (including distributed), large-capacity transmission technologies, and advanced transmission technologies. Sense network technology, power communication and information technology.

UHV is an important component of China's third generation grid

Research shows that at present, China is still in a stage of rapid development, electricity demand will continue to rise; energy resources and demand are in a reverse distribution, new hydropower is mainly concentrated in Sichuan, Yunnan, and Tibet, and new wind power is mainly distributed in the “Three North” region. , Solar power is focused on centralized development (Northern West) and decentralized layout; the large-scale, cross-regional coal, water, wind, and solar energy deployment patterns have been determined, and the overall power flow pattern is “from west to east and from north to south”. The power flow in the province will continue to expand.

Therefore, in the future for a long time, China will have the basic needs of large-capacity long-distance transmission. As pointed out by Liu Zhenya, the general manager of the State Grid Corporation of China, "Accelerating the development of UHV and realizing 'substituting coal by electricity, replacing electricity by electricity, and electricity by electricity from afar' is an inevitable choice to solve China's energy problems. UHV will not only promote Optimizing the allocation of energy resources throughout the country, promoting the accelerated development of clean energy, and upgrading the equipment manufacturing industry will also provide strategic options for the construction of intercontinental transmission channels.” Xie Kechang also said: “In the new energy consumption mode, we must focus on improving the power in the terminal. As for the proportion of energy consumption, UHV-based grids are responsible for promoting the revolution in energy production and consumption."

For the specific development model of China's third-generation power grid, Zhou Xiaoxin introduced: "From now to the mid-term period of 2030, China's transmission grid will maintain the super/ultra-high voltage AC-DC transmission grid model from 2031 to 2050.

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