A few days ago, the 1000 kV Huai'nan Nanjing UHV AC project started to pass the approval of the National Energy Administration. According to the author's understanding, this route has been complicated, controversial, and has been controversial, from the planning and development of preparatory work to entrusting third-party assessments and reporting to the National Energy Administration. The reason is that this project is an UHV AC line and it is an East China UHV network project. Is an important part of it.
The exchange has a network function and can flexibly collect, transport, and distribute power. It is the basis for the construction of the power grid and safe operation. DC is equivalent to a fully-enclosed point-to-point expressway and has economic advantages in large-capacity, ultra-long-distance transmission. High-voltage AC lines and DC lines are not competitive and are complementary. The scientific combination of the two can make the power transmission efficient, economical and stable. Among them, it is possible to flexibly adjust the direction of transportation after constructing a system from the exchange. On the one hand, the load can be adjusted at the demand side through a peak shift method. On the other hand, energy advantages can be complemented at the supply end.
At present, UHV DC and Jinsu ultra-high voltage direct currents have been sent to the East China Power Grid, and the Xinjiang UHVDC project will be put into operation, together with plans for the east of the East China Highway, Ningdong Zhejiang Province, Xijin Taizhou and other UHV DCs. In the future, there will be multiple DC UHVs sent to East China Power Grid. Large-scale DC external access terminals need to rely on a strong AC power grid to ensure safe and reliable operation. If the eastern China UHV network is completed, it will form more than two UHV AC channels with the power outside the zone. Even if the two DC faults do not require the removal of loads or power outages, AC-DC UHV should be coordinated and developed simultaneously.
This is as pointed out by Zhang Zhengling, deputy director of the National Grid Development and Planning Department: How large is the size of the DC grid and how large the size of the receiving grid is, like throwing a small stone into a small basin, but losing a large one Stones will splatter water, so how big a stone is, there must be a relatively large enough basin so that the water does not spill out.
Up to now, with the exception of Jindongnan Nanyang Jingmen UHV AC pilot demonstration project across the two major power grids in North China and Central China, the Pudong-East power project that has been put into operation and the Zhejiang Ford high-voltage AC line under construction are all UHV ACs in the East China Power Grid. engineering. The long-lived and clear reality promotes the UHV speed increase, including not only the UHV DC project but also the UHV AC project within the regional grid and the UHV AC project across the region, depending on whether it is conducive to ensuring the safe and stable operation of the grid. Can we obtain greater economic, environmental and social benefits?
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