利用S变换能量相对熵的幅值比较式超高速方向元件

发布时间：2018-07-22 14:31

【摘要】：为提高行波方向元件的可靠性,在分析故障方向特征的基础上,提出一种新的幅值比较式方向元件。不同故障方向下,前行波和反行波特征不同。正方向时前行波和反行波差异较小,反方向时两者差异较大。利用S变换能量相对熵量化前、反行波之间的差异程度。考虑到电容式电压互感器(CVT)不能传变较高频率的电压分量,对前、反行波进行S变换后选择较低频率的分量计算能量相对熵,进而构成方向判据。基于PSCAD/EMTDC的仿真结果表明,所提方向元件能够快速可靠地判断故障方向,其性能不受故障初始角、过渡电阻、故障位置、故障类型、母线接线方式和电弧故障的影响。
[Abstract]:In order to improve the reliability of traveling wave directional elements, a new amplitude comparison directional element is proposed based on the analysis of fault direction characteristics. The characteristics of forward wave and anti-traveling wave are different in different fault direction. The difference between the forward wave and the reverse wave in the positive direction is small, and the difference in the opposite direction is larger. The degree of difference between reverse traveling waves before quantization of energy relative to entropy using S-transform. Considering that capacitive voltage transformer (CVT) can not transmit the higher frequency voltage component, the energy relative entropy of the lower frequency component is calculated after S transform of the backward traveling wave, and then the direction criterion is formed. The simulation results based on PSCAD / EMTDC show that the proposed directional element can quickly and reliably judge the fault direction, and its performance is not affected by the fault initial angle, transition resistance, fault location, fault type, busbar connection mode and arc fault.
【作者单位】：西南交通大学电气工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA050208) 国家自然科学基金资助项目(51307145) 中央高校基本科研业务费专项资金资助项目(SWJTU11ZT07) 西南交通大学博士研究生创新基金资助项目~~
【分类号】：TM711

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