摘要
雷击输电线路产生的暂态分量会对基于行波或暂态量的特高压输电线路装置造成干扰,是影响行波测距装置精度的主要因素之一,正确识别非故障雷击、雷击故障与普通短路故障具有重要意义。利用非故障雷击时较短时间内的波形对称性和故障时的波形单调性,对电压行波进行积分运算,可识别非故障性雷击与故障,但无法区分短路故障和雷击造成故障。针对雷击和短路时电压行波的能量谱分布特点,提出运用改进的HHT算法对雷击和短路时的电压行波进行能量谱分析的方法,利用故障暂态电压的相对低频分量与相对高频分量的能量比识别短路故障和雷击故障。PSCAD/EMTD仿真结果验证了所提方法的有效性。
The transient signals generated by lightning strike may interfere with the travelling wave based equipments. Thus identification of lightning strikes is significant. The transient characteristic difference between the common fault and lighting strike is described in this paper. Using the characteristics of symmetric voltage waveform induced by light ning interference and that of asymmetric voltage waveform generated by fault within a very short interval, the waveforms of transient voltage above and below timeaxes are integrated, respectively. Lightning interference and fault could be i dentified by comparing their relative ratio value of transient waveform. But in this method shortcircuit faults and faults of lightning couldn＇ t be distinguished. Aiming at the problem, we analyzed the energy spectra of voltage transient components by improved HHT algorithm, and found that shortcircuit fault and most faults of lightning could be identi fied by the energy ratio of the relative lowfrequency components and the relative highfrequency components. The PSCAD simulation results demonstrate that the proposed criterions are valid and correct.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2013年第6期1-6,共6页
Journal of North China Electric Power University：Natural Science Edition
关键词
改进HHT
积分
雷击
输电线路
improved HHT algorithm
integral
lightning strike
transmission line
作者简介
朱永利（1963-），男，教授，博士生导师．研究方向为输变电设备状态在线监测，智能分析与智能电网：
梁泽慧（1989-），女，硕士研究生，研究方向为电力系统运行分析与控制。
