基于数学形态学的暂态行波方向保护方案

Scheme for transient traveling wave -based directional protection using mathematical morphology

在分析暂态行波电流和电压的特征关系基础上,利用数学形态学在检测信号奇异性的优越性,根据其初始波头极性对线路的区内、区外故障做出准确、快速的判断,提出了一种基于数学形态学的暂态行波方向保护方案。采用ATP对各种故障所做的仿真计算验证了所提出的保护原理的正确性和有效性。

To overcome the shortcoming of misjudgment in the traveling wave -based directional protection, a new scheme is proposed based on the analysis of characteristics of transient traveling wave voltage and current of power system faults occurred in EHV transmission lines. The mathematical morphology is used to extract the transient features of voltage and current. The basic principle of this scheme is demonstrated. The polarities of transient voltage and current are compared. ATP simulation on a typical 500 kV EHV transmission line system is conducted. Simulation results of different fault inception angles and fault resistances prove that this scheme is effective under different fault conditions.