小波奇异熵及其在超高压输电线路暂态保护中的应用

在研究小波变换、奇异值分解及信息熵理论的基础上,进行了线路模型参数的选择研究,分析了小波奇异熵的应用原理和本质,并将其应用于超高压输电线路的暂态保护,同时提出了基于小波奇异熵的暂态保护判据。基于PSCAD/EMTDC的故障仿真结果表明:该保护判据能快速准确地识别区内、外故障,并且不易受到故障时刻、过渡电阻、故障位置等因素的影响,具有较好的适应性。

Wavelet singular entropy and its application in the transient protection for EHV transmission line

Based on the research of wavelet transform,singular value decomposition and information entropy theory,this paper analyzed the selection of line parameters and proposed a transient protection criterion derived from wavelet singular entropy and applied it in EHV transmission lines transient protection.simulations in PSCAD/EMTDC show that this protection criterion can not only distinguish internal fault and external fault rapidly and accurately,but won't be affected by failure's location,failure's transition resistance or faulty time,having a good adaptability.