南方电网西电东送交直流混合输电系统安全稳定性分析

随着国家“西部大开发”战略的实施，南方电网“西电东送”工程的建设进入了快速发展阶段，南方电网已成为我国第1个也是目前唯一的500kV超高压远距离交直流混合输电的大型区域电网。现以我国南方电网已经形成的“两交一直”和即将“五交两直”的交直流混合输电系统为基础，对南方电网进行分析，揭示其输电能力、薄弱环节和采取安全稳定控制措施等安全稳定特性，表明通过合理优化和正确制定安全稳定控制策略，保证安全自动装置动作的可靠性，交直流混合输电系统不仅可取得较大的输电效益，而且也可安全稳定运行。

Security and stability analysis of AC/DC hybrid transmission system from west to east in China southern power grid

Transmission power projects from west to east are developing quickly with the strategy of China developing western regions goes. China southern power grid is the first and only one large power system with AC/DC hybrid transmission in China. According to the existing transmission system with two AC lines and one DC line and the coming transmission system with five AC lines and two DC lines in China southern power grid, this paper analyzes their security and stability characteristics mainly on transmission capacity, operation weakness and system control measures. Under right and reliable system control measures, AC/DC hybrid transmission system can operate with not only good economic efficiency but also safety and stability.