Facing the attack of extreme natural disasters, how can we avoid the apocalyptic blackout scenes from movies becoming reality, or at least ensure that the core areas of cities do not lose power, minimizing the potential socio-economic impact of disasters?
In response, China Southern Power Grid (CSG) has for the first time proposed the concept of a disaster-prevention guaranteed power grid and released special plans for guaranteed power grids in 28 major cities. During the "13th Five-Year Plan" period, CSG will construct guaranteed power grids in 28 major cities with an infrastructure investment of approximately 26.9 billion yuan, covering major cities in the southern region including Guangzhou and Shenzhen, as well as other prefecture-level cities whose central urban areas are in coastal strong wind zones or heavy ice zones.
"Since June, precipitation in southern China has significantly increased, and it is expected that 4 to 6 typhoons will make landfall on the coasts of Guangdong, Guangxi, and Hainan from July to September," said Xu Daming, Director of the Planning and Development Department of CSG. CSG is located in areas prone to natural disasters such as typhoons, low-temperature rain, snow, freezing, earthquakes, and mudslides, making it susceptible to natural disasters.
According to the plan, during the "13th Five-Year Plan" period, CSG will focus on promoting the planning and construction of guaranteed power grids in 28 major cities, including 15 major cities such as Guangzhou, Shenzhen, Nanning, Kunming, Guiyang, and Haikou, as well as 13 other prefecture-level cities whose central urban areas are in coastal strong wind zones or heavy ice zones, such as Zhanjiang and Qujing.
In these 28 cities, CSG will appropriately raise the design standards for guaranteed power grids. New guaranteed power grid projects planned in coastal strong wind zones will be constructed according to a 50-year return period for meteorological events, which is expected to improve the wind resistance of overhead lines at 220 kV and below by 20% to 25%. In coastal areas, CSG will combine urban planning development and utility tunnel construction needs to promote the cable conversion of guaranteed lines and the indoor conversion of guaranteed substations. In medium to heavy ice zones, guaranteed lines will be equipped with ice-melting devices to ensure that the guaranteed power grid "does not collapse" under ice disaster conditions.
Xu Daming believes that the construction of guaranteed power grids is to promote the transformation of power grid disaster prevention and resistance from "passive response" to "active defense." "Conventional power grid construction mainly aims to provide electricity to everyone, with all regions built to the same standard, without much consideration for disaster prevention in core areas. Once a natural disaster such as a typhoon causes a power outage, we can only passively rush to repair it," he said. Now, building guaranteed power grids means comprehensively analyzing past disaster situations and proactively raising the disaster prevention level of core areas. Xu Daming revealed that the 28 city power grids within the scope of this plan will adopt corresponding measures based on their respective disaster characteristics.
According to the guaranteed power grid construction plan, it is expected that by 2020, the disaster-prevention guaranteed power grids in the 28 major cities will cover an average of about 80% of key users. The average proportion of 220 kV guaranteed power grid scale will be about one-third, and the average proportion of 110 kV guaranteed power grid scale will be about 20%.
