【作者】 王苹； 黄翔东； 杨琳； 方红伟； 林倩； 高伟；

【Author】 WANG Ping;HUANG Xiangdong;YANG Lin;FANG Hongwei;LIN Qian;GAO Wei;College of Management and Economics,Tianjin University;School of Electrical and Information Engineering,Tianjin University;College of Physics and Electronic Information Engineering,Qinghai Nationalities University;Jishui Branch Company of JiangXi Electric Power Co.Ltd,State Grid;

【机构】 天津大学管理与经济学部； 天津大学电气自动化与信息工程学院； 青海民族大学物理与电子信息工程学院； 国网江西省电力有限公司吉水县供电分公司；

【摘要】 提出一种检测电网工况故障的方法。基于全相位滤波原理,从具有斜坡特征的频率向量中推导出数字微分器及其系数解析式,其幅频响应值在低频段被抑制至零点附近,在高频段则呈现出较理想的斜坡形状,故该微分器可锐化信号的突变特征。仿真实验证明,当电网工况故障信号通过全相位数字微分器时,其信号平稳段的输出幅值近乎为0,而突发故障时段的波形输出得以急剧放大,从而凸显出故障发生时刻,有助于电网工况质量的实时监测。更多还原

【Abstract】 This paper proposes a digital-differentiator based method of fault moment detection in power grid.By utilization of the classical all-phase filtering principle,a closed-form differentiator can be designed from a slope-shaped frequency sampling vector.Specifically,its magnitude-frequency response is nearly suppressed to zero across the low frequency band,whereas it also appears an ideal slope shape across the high frequency band.This property endows the differentiator with a merit of sharpening the sudden jump the signal.Simulation result shows that,when the proposed differentiator is utilized to deal with power fault signals,its output nearly approximates 0 across the stationary period,whereas its output acquires an extremely great gain at the sudden fault moment.Thus,the fault moment is highlighted,which is helpful for monitoring the working condition quality of power grid in real time.更多还原