不对称短路时电抗型故障限流器对暂态稳定性的影响

摘要

针对单机对无穷大系统,提出了在输电线路不同位置发生不对称短路故障时,故障限流器(FCL)投入电抗后对暂态稳定性影响的分析方法.基于功角特性曲线分别详细分析了在单相接地短路、两相接地短路和两相短路故障下电抗型FCL对暂态稳定的影响情况.通过对接入电抗型FCL的电力系统进行不同类型故障下的暂态稳定时域仿真研究,验证了分析结论.%Transient stability of a single machine to infinite-busbar power system with reactance-type fault current limiters (FCL) is analyzed under asymmetrical short-circuit fault conditions. The FCL is considered to introduce a reactance into the three-phase circuits when faults occur. Based on the power-angle curves for different short-circuit conditions - the single-line to ground, double-line to ground and double-line short-circuit faults, the influences of the FCLs to transient stability is analyzed in details. The time-domain simulation of transient stability is carried out to verify the analytical results.