超导故障限流器对电力系统暂态稳定性的影响分析

Influence Analysis of Transient Stability for Superconducting Fault Current Limiter on Power System

根据超导故障限流器(SFCL)失超后表现出的阻抗特性,可将SFCL分为2类:电感型和电阻型。针对单机无穷大系统,推导出了在输电线路不同位置发生短路故障时,投入超导故障限流器后的总转移阻抗和发电机的输出功率表达式。从功角特性曲线上分别分析了电感型和电阻型超导故障限流器对电力系统暂态稳定性的影响情况,从数学上进行了证明,并从物理上进行了解释。最后用改进欧拉法编程,对接入SFCL的电力系统进行了暂态稳定时域仿真研究。

According to the characteristics of superconducting fault current limiters （ SFCL ）, the SFCL can be divided into two types： inductor type and resistor type. The total transfer impedance and the generator power-output expressions are deduced after introducing SFCL when short circuit faults occurs on different locations of a transmission line in a single machine to infinite-busbar system. From the view of the power angle relationship, the effects of inductor type and resistor type SFCL on power system transient stability are analyzed, a mathematical proof and a physical explanation are also given. The improved Euler algorithm is used for the time-domain simulation of transient stability to proving the analytical results.