一种接入SSSC的交流线路自适应距离保护方法

Adaptive Distance Protection Scheme in Presence of SSSC

针对含有SSSC的交流线路,考虑过渡电阻对SSSC旁路保护的影响,提出了一种可靠的自适应距离保护方法。根据线路故障时短路电流SSSC旁路保护电流整定值的关系,提出临界过渡电阻的概念,划分SSSC退出运行区和不退出运行区。基于电压电流的相位关系,提出SSSC退出运行和不同补偿模式下的自适应距离保护方案。PSCAD/EMTDC的仿真结果验证了该方案的准确性和可靠性。

Aiming at the AC circuit that contains SSSC and considering the influence on SSSC bypass protection by the presence of transition resistance, a reliable adaptive distance protection scheme is presented. In this paper, the concept of critical transition resistance is proposed according to the relation between short-circuit current and current setting value of SSSC bypass protection when line fault happens. And the presence or absence of SSSC is determined. Based on the relationship of voltage and current vector, this paper puts forward a new adaptive distance protection scheme in the absence of SSSC and in the presence of SSSC which works in the capacitive or inductive compensation mode. Simulation results based on the PSCAD/EMTDC verifies the correctness and reliability of the proposed adaptive distance protection scheme.