CCTV News: Today (May 21), the flexible DC back-to-back power grid project with the largest capacity in the world and the first realization of partition interconnection in the power grid load center was completed in the Guangdong-Hong Kong-Macao Greater Bay Area and started production, which will greatly improve the Guangdong-Hong Kong-Macao Greater Bay Area. Power supply guarantee capability.
The Guangdong-Hong Kong-Macao Greater Bay Area DC back-to-back power grid project is to build a new flexible DC converter station in Zengcheng, Guangzhou and Shatian, Dongguan, respectively.
The two power grids "back to back" are like two people "holding hands" with each other, usually "supporting each other", and "letting go at any time" in case of unavoidable failures, there is a "firewall" between each other to avoid "burning the company", a small area When a fault occurs, it can be quickly isolated, and the power outage can be controlled in a small area, effectively avoiding large-scale power outages.
Rao Hong, academician of the Chinese Academy of Engineering and chief technical expert of China Southern Power Grid: This project is the first time in the world that the complex structure of the power grid has been reasonably partitioned, and it is the first time that the flexible DC technology is used to flexibly interconnect the partitioned power grids. In the event of a fault, power support can be quickly performed in less than 0.1 second, which greatly improves the safety and stability of the Guangdong-Hong Kong-Macao Greater Bay Area power grid.
This internationally leading power grid project has an investment of 9.9 billion yuan and took two years to build, driving the upstream and downstream industry chain to invest about 8 billion yuan, creating many world firsts in power grid engineering.
The just-completed Guangdong-Hong Kong-Macao Greater Bay Area DC back-to-back power grid project is equivalent to a complicated major operation for the Guangdong-Hong Kong-Macao Greater Bay Area power grid. It solves the problem of how to provide safe and stable power for the future development of the Greater Bay Area.
The Guangdong-Hong Kong-Macao Greater Bay Area is the region with the most active economy and the most intensive power load in China. The huge power load superimposes numerous west-to-east power transmission channels, as well as a large number of new energy sources such as offshore wind power and distributed photovoltaics. The grid is getting bigger and bigger and more complex, and the risk of operation is also increasing day by day.
The new DC back-to-back project is to enhance the security of the power grid in the Guangdong-Hong Kong-Macao Greater Bay Area and enhance the power supply guarantee capability.
Ling Yizhen, Infrastructure Department of China Southern Power Grid Guangdong Power Grid Company: Such a grid structure can avoid "putting eggs into the same basket" and greatly reduce the risk of large-scale power outages caused by mutual involvement.
When mutual supply and support are required, they can support each other through the outer ring line.
At the same time, the flexibility of the power grid has become higher, which is more conducive to the access of large-scale new energy sources.
Not only that, the flexibility of the grid operation in the Greater Bay Area after intelligent zoning will also be greatly increased, and new energy sources such as wind power and photovoltaics can be absorbed and utilized on a larger scale. This year, 6 million kilowatts of offshore wind power, western hydropower, etc. clean energy.
It is understood that during the "14th Five-Year Plan" period, China Southern Power Grid will invest over 38 billion yuan to improve the Guangdong grid.
The outer ring of the Greater Bay Area will build a 500 kV ring line over 2,000 kilometers, which will increase the power supply capacity of the Guangdong-Hong Kong-Macao Greater Bay Area by 80%, and the average annual power outage will be less than half an hour.