BEIJING, Oct. 5 (Xinhua) -- The second phase of the Yangzhou-Zhenjiang ±200 kV direct current (DC) power transmission (Yangzhen DC Phase 2) project has started construction recently, marking a key step forward in expanding the in-depth application of AC/DC hybrid power grid technology to help accelerate the construction of a clean, low-carbon, safe and efficient new energy system in China.
Connecting the two cities of Huai'an and Danyang in east China's Jiangsu Province, the demonstration project is expected to add approximately 228 kilometers of DC power transmission lines to the existing power grid and construct a ± 200 kV converter station at each of the generation end and the reception end, according to State Grid Jiangsu Electric Power Co., Ltd.
It is learned that the Yangzhen DC Phase 2 project, which is scheduled to be put into operation in 2026, will help increase the transmission capacity by another 1.2 million kilowatts, effectively alleviating the pressure on north-to-south power transmission in Jiangsu and improving the flexibility of power grid operation.
Wang Weiyuan, director of the main grid planning unit of the development planning department of State Grid Jiangsu Electric Power Co., Ltd., noted that the company will step up efforts to accelerate the planning and construction of key projects, actively build a provincial AC/DC hybrid power grid and further optimize the allocation of power grid resources.
China's current main power grid is primarily composed of AC power grids. AC power generation and transmission technology is relatively mature in the country. However, compared with AC transmission, DC transmission at the same voltage level can transmit larger amounts of power with more flexibility.
In August this year, China issued a plan to push forward the large-scale renewal of equipment in key energy fields. According to the plan, the country will promote the research and development (R&D) and application of advanced technologies, such as hybrid AC/DC power grids, in an attempt to accelerate the digital and intelligent upgrading of power grids. (Edited by Yang Yifan with Xinhua Silk Road, yangyifan@xinhua.org)
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