Whether it is the Southwest Hydropower Base, the Northwest fire scenery base, or the construction of the western end of the grid, which are characterized by large installed capacity, small load, power consumption can not be absorbed in the local, only delivery. Well, the problem came, delivery Where is the landing? Acceptable regions are willing to accept? What problems need to be solved?
In order to get rid of cyber barriers, inter-provincial barriers and local protection, it is necessary to combine planning and marketing with the two measures to play their respective roles and play an active role in both. Accelerating the construction of transmission routes through planning means and optimizing the allocation of resources through market means, It is a long-term plan to allow electricity to enter the area "willingly" to accept incoming calls outside the area.
Recently, the National Development and Reform Commission and the National Energy Administration released the "Circular on Promoting Hydropower Consumption in the Southwest Region" (the "Circular") requiring that SGCC and China Southern Power Grid Company should build up a plan for the "13th Five-Year Plan" Guangdong ± 800 kV DC transmission project to start the transmission of Sichuan Hydropower Extra high voltage DC transmission project in Jiangxi Province, Wudongde power transmission project in Guangdong Guangxi transmission.At the same time, the National Development and Reform Commission, National Energy Board will be with the relevant provincial government departments, power grid companies, Promote the construction of transmission channels in Guizhou, Sichuan and Shaanxi in Shaanxi Province. Consider planning to connect the Guizhou Power Grid in Yunnan to increase the capacity of the access roads in Shaanxi and Shaanxi Provinces to achieve interconnection and interaction between adjacent power grids.
Southwest abandoned water pressure increases
Need to open up new delivery channels
Southwest China is an important energy base, public data show that the reserves of hydropower resources in Sichuan is about 143 million kilowatts, technology development is about 120 million kilowatts, ranking first in the country; Yunnan Economic Development hydropower installed capacity of 97.95 million kilowatts, ranking the national Second, Tibet is rich in water resources and an important backup base for China's hydropower.
In the meantime, there are the Northwest Hydropower Base, wind power base, solar energy base, coal base in the north and Huazhong Hydropower Base in the east, and South China Nuclear Power in the southwest, which will be beneficial to boost economic development, especially the wet season In recent years, the State Grid to speed up the 'Chuandian outgoing' channel construction at the same time, in order to reduce the cost of water and electricity supply at a relatively low price, dry season may also be appropriate to accept adjacent thermal power, optoelectronics, etc., Also actively promote the 'Xinjiang into the river', 'Tibet into the river', 'Sichuan into Chongqing' and so on.
Up to now, there are mainly 3 UHV DC transmission lines of ± 800 kV Fu-Fu, Jin-Su and Bin-Jin of Sichuan Hydropower Outgoing Passages with transmission power of 6.4 million kilowatts, 7.2 million kilowatts and 8 million kilowatts, respectively. The total transmission power reaches 21.6 million kilowatts, plus ± 500 kilovolt Debao DC, Sichuan to Chongqing 6 back to 500 kV AC lines and Sichuan-Tibet network project, Sichuan hydropower delivery capacity of about 30 million kilowatts.
In the meantime, in recent years, the South Network is also accelerating the construction of a major thoroughfare from west to east, sending out and consuming Yunnan hydropower. As of now, there have been 17 500 kV and above large passage, 500 kV and above voltage level transmission line more than 20,000 kilometers, channel capacity increased to 43.6 million kilowatts.
It is understood that a number of hydropower projects under construction in Sichuan will be put into operation one after another, and it is estimated that the total installed capacity of clean energy in Sichuan will reach 100 million kilowatts by 2020. If there is no new power transmission channel, more than 20 million kilowatts of surplus power will not be sent out , But also can not be absorbed locally, each year will exceed 500 billion kilowatt hours of water. In Yunnan, there are similar problems, on the one hand, large-scale hydropower and other power sources in the province put into operation; the other hand, the province's slow growth in electricity consumption , Prompting the hydropower issue highlights the issue.More importantly, most of the Southwest hydropower installed capacity of ethnic minority areas and poor areas, the limited development of clean energy industry is bound to affect the local residents out of poverty.
To this end, the "Circular" requires that State Grid and South China Network should build a ± 800kV DC transmission project from northwest Yunnan to Guangdong in the "13th Five-Year Plan" as soon as possible so as to start the transmission of Sichuan UHV DC UHVDC transmission project by Sichuan Hydropower. Power transmission Guangdong Guangxi power transmission project, combined with the construction of cascade construction put into operation sequence, and actively coordinate the promotion of Baihetan Hydropower Station and the Jinsha River upstream hydropower delivery channel construction work, strive for the 'Thirteen Five' new Sichuan power transmission capacity of more than 20 million kilowatts , The new transmission capacity of 13 million kilowatts more than Yunnan, to ensure that the water supply channel needs.
Adjacent power grid to enhance interoperability
Western sent to the grid ready to come
Liu Zhenya, Chairman of China's Energy Internet Development Cooperation Organization and chairman of CEC, had proposed during the tenure of the chairman of the State Grid that it is necessary to construct the Sichuan, Tibet and Southwest Chongqing synchronous grids. He pointed out that the construction of the southwest power grid will greatly optimize the layout of China's energy sources and power It is of great significance to solve the large-scale development of clean energy in our country with the pattern of "mutual benefit of water and fire" , Its purpose and significance is self-evident.
Prior to this, Chongqing and Sichuan belonged to Huazhong Power Grid, and Tibet operated as a solitary network.With the operation of Qinghai-Tibet network, ending the history of Tibet's solitary network operation, Sichuan-Tibet network connected Tibet's Changdu Power Grid and Sichuan Power Grid, covering Sichuan After the completion of the southwestern power grids in Tibet and Chongqing, it will be the largest installed base of power in the country and the Southwest Power Grid will deliver clean energy with hydropower as the main power source compared with the northwest and northeast power grids, with the largest number of lakes in the world Of the country's Norwegian power grid can be comparable.
May 25 this year, Chongqing and Hubei DC back to back networking project started.According to the relevant planning, the project completed and put into operation in 2018, Sichuan and Chongqing Power Grid and the four central eastern provinces will achieve asynchronous interconnection grid, the national network structure to further optimize the construction of the southwest A fundamental step forward on the power grid can fundamentally solve the stability problem of 500 kV long-span power grids, effectively reduce the structural risks brought by the 'weakened power grid' of UHV grids, simplify the control strategy of power grid security and stability, Improve the flexibility and reliability of power grid operation, and lay the foundation for further interconnection of power grids with different types of resources in southwest and northwest China and construction of a large power transmission network to the west.
At present, the transmission channel between Sichuan and Shaanxi is only ± 500 kV Debao DC. The "Circular" calls for pushing forward the transmission channel construction in Shaanxi and Sichuan and increasing the capacity of the channel in Shaanxi Province, Sichuan. This will enhance the interconnection between Sichuan and Shaanxi and Northwest Power Grids, and Southwest Hydropower and Northwest Fire Wind Photoelectric mutual aid.
According to the relevant planning, during the 13th Five-Year Plan period, the State Grid will promote the exchange of 'Sanhua' and northeast China via the UHV network to form the eastern synchronous grid and connect the northwest with Sichuan, Chongqing and Tibet via the UHV AC grid to form the western synchronous grid Send, by the end of the structure is clear, the exchange and DC coordinated development of two synchronous grid.
In the operating area of South Network, South Network is fully speeding up ± 800kV DC transmission project from northwestern Yunnan to Guangdong and is expected to be completed and put into production in June 2018. Meanwhile, it will speed up the transmission of Guangdong UHVDC three-terminal direct current project , And strive to obtain project approval and start construction by the end of this year, and will form the power transmission capacity by the end of 2019, all of which will be completed and put into production by 2020. By then, the capability of sending electricity from west to east in Yunnan will increase from 26.2 million kilowatts in flood season in 2017 to 39.2 million kilowatts. 13 million kilowatts.
South Network stakeholders, the South Network 'west to east' channel, Yunnan and Guizhou no direct channel interconnection, are transmitted through Guangxi, Guangdong, with the Luxi back to back engineering put into operation, Yunnan and Guizhou realized asynchronous networking. The Circular requires that the construction of power transmission corridors in Guizhou Province of Yunnan Province be promoted and that connecting Guizhou Guizhou Power Grid from the planning point of view will achieve interconnection and interoperability between the two power grids and achieve mutual benefits.
In addition, the "Circular" also calls for strengthening the research on transmission channel planning between the State Grid and the South Network, improving transmission capacity, establishing a hydropower cross-network elimination mechanism and further expanding the space for Yunnan Hydropower Consumption.