国家“十四五”规划重点工程——青藏直流 二期扩建工程正式投运

Core Insights - The Qinghai-Tibet DC Phase II Expansion Project has officially commenced operations, doubling the power transmission capacity between Qinghai and Tibet to 1.2 million kilowatts, which is crucial for enhancing electricity supply security in Tibet and optimizing the allocation of clean energy [1][2] Group 1: Project Overview - The project aims to meet the growing electricity demand in Tibet and improve the bidirectional transmission capacity of the Qinghai-Tibet DC interconnected project [2] - The total investment for the project is 2.603 billion yuan, with construction starting in May 2023 and operations beginning on September 28, 2023 [2] - The project includes upgrades to the existing control systems, enhancing flexibility and reliability [2] Group 2: Technical Achievements - The project is notable for being the first in China to adopt a converter parallel scheme and to expand on an existing operational project at a high altitude [2][4] - The transmission capacity will allow for winter electricity supply to Tibet, meeting 35% of the region's electricity needs during dry seasons [2] - The project will increase the annual clean energy transmission from Tibet to 2.1 billion kilowatt-hours, leveraging the advantages of a large interconnected grid [3] Group 3: Challenges and Innovations - The construction faced significant challenges due to high altitude, with the project site located at 3,850 meters above sea level, where oxygen levels are about 60% of that at sea level [4] - A medical base was established on-site to ensure the health and safety of construction personnel [4] - The project has increased the number of operational modes from 45 to 117, enhancing its operational flexibility [3][4] Group 4: Strategic Importance - The project supports the national strategy for energy security and the transition to a new power system, contributing to the largest UHV transmission network globally [4] - The cross-regional transmission capacity has increased by 61% from the end of the 13th Five-Year Plan, now exceeding 370 million kilowatts [4] - The company is committed to ensuring early operation and effectiveness of projects while balancing development and safety [4]