Current limiting strategy by adjusting power grid configuration based on improved REI equivalent method [基于改进REI等值法的网架调整限流策略]

作者：Hui Y.^*; Huang J.; Li Z.; Lin X.

来源：Power System Protection and Control, 2018, 46(8): 17-23.

DOI：10.7667/PSPC170466

• Current limiting sensitivity index
• Dynamic characteristics
• Power transfer distribution factors
• REI reduction technique
• Short-circuit current over-limited

For increasing the efficiency of previous whole network traversal current limiting project, a current limiting strategy by adjusting power grid configuration based on improved REI equivalence is proposed for large-scale power system. It combines the network equivalence technology with current limiting mechanism by adjusting 500 kV power system configuration and carries out a pretreatment to primary system according to the branch current limiting sensitivity index. Original system is divided into research system and several external subsystems. The subsystems are simplified using improved dynamic REI equivalence method, and the parameters of the equivalent generator are calculated according to power transfer distribution factors of each generator on virtual branch during equivalence. The simulation results of two cases show that the improved REI equivalence method can better preserve the dynamic characteristics of the original system and quickly select the optimal breaking lines.

• 单位
  强电磁工程与新技术国家重点实验室; 华中科技大学; 三峡大学