中文摘要：

摘要：针对断面连锁过载跳闸是过载支路切除后系统发生连锁故障的重要原因，提出了一种基于状态分区的含多电压等级输电断面快速搜索方法。通过算例分析了该算法并介绍了仿真结果。

英文摘要：

According to cascading failure that is triggered by cascading overload trip of section caused by overload branch removal, the paper proposes an algorithm fast searching for transmission section with multi-voltage level based on state partition. Firstly, the algorithm establishes state graph of power system according to the real-time network to- pology and load flow after different voltage grade line parameters are normalized to the same voltage level; then based on power flow transferring characteristics, finds out the interregional and regional transmission section suffered from the outage of overload branch, forming the extended transmission section ; finally uses the overload affected degree in- dex to recognize the overload transmission section suffered greatly from power flow transferring. Thus, the range of se- curity analysis and workload of further analysis can be greatly reduced, so it＇s very beneficial to the preventing of cas- cading tripping. The simulation results show that, the method is simple, fast and suitable for on-line application, its validity is verified.