藏中联网后西藏电网安全稳定特性及控制策略分析

Analysis on Security and Stability Characteristics and Control Strategy of Tibet Power Grid After Operation of Central-Tibet Networking Project

摘要: 500 kV藏中联网工程投运后,西藏电网与西南主网联为一体,解决了长期困扰西藏地区的缺电问题。然而,联网初期由于长链式交流通道稳定水平低和柴拉直流与交流通道交互等因素的影响,西藏电网产生了新的安全稳定问题。针对藏中联网工程投运后存在的典型安全问题进行分析,如柴拉直流与交流通道交互影响、西藏电网负荷特性对藏中孤网的影响及500 k V/220 k V电磁环网的影响,讨论其安全稳定控制策略。

Abstract: After the operation of 500 k V central-Tibet networking project,Tibet power grid and Southwest power grid are integrated together to solve the problem of power shortages faced by Tibet power grid for a long time. However,due to the low level of stability of long-chain AC channels and the interaction of Chaila HVDC and AC channels,the Tibet power grid has created new security and stability problems. The typical security problems existing after the operation of central-Tibet networking project are analyzed,such as the impact of interaction between the Chaila HVDC and AC channels,the impact of load characteristics of Tibet power grid on the isolated grid in Tibet,and the impact of 500 k V/220 k V electromagnetic ring network. And then its security and stability control strategies are discussed.