小角度法结合复合形态滤波器的单相电压跌落检测方法  

Single phase voltage sag detection method based on small angle method combined with complex morphological filter

作　　者：周军[1] 何振梁 李曙光[1] Zhou Jun;He Zhenliang;Li Shuguang(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)

机构地区：[1]东北电力大学电气工程学院

出　　处：《电测与仪表》2020年第2期116-121,128,共7页Electrical Measurement & Instrumentation

基　　金：吉林省科技厅科技发展计划重点科技研发资助项目(20180201010GX);吉林省发展改革委节能环保型应急电源ISPS关键技术研究及装置开发项目(2019C057-3)

摘　　要：针对当前电网电压跌落频繁和传统电压跌落检测方法准确性和快速性不足的问题,提出一种延迟小角度法结合复合形态滤波器的单相电压跌落快速检测方法。详细论述了延迟小角度法和复合形态滤波器的工作原理,先使用复合形态滤波器对电力信号进行初次滤波,再通过延迟小角度的方法构造虚拟三相电压,对三相电压进行Park变换并用直线形态滤波器滤除残余的谐波分量。仿真分析了复合形态滤波器的滤波效果,对受到复杂噪声和谐波干扰的电压跌落波形进行了仿真测试,并搭建了实际的电压跌落硬件模型且使用采集到的数据再次对算法进行了验证,结果都表明该方法能够快速准确地检测出电压跌落起止时刻、深度和相位。Aiming at the problems of frequent voltage sags and the inaccuracy and rapidity of traditional voltage sags detection methods,a fast single-phase voltage sags detection method based on delay small angle method and composite morphological filter is proposed in this paper. The working principle of the small angle delay method and the composite morphological filter are discussed in detail. The method firstly adopts the composite morphological filter to filter the power signal,and then,constructs the virtual three-phase voltage by the small angle delay,transforms the three-phase voltage by Park and filters the residual harmonic components by the linear morphological filter. The filtering effect of the composite morphological filter is simulated and analyzed. The voltage sag waveforms disturbed by complex noises and harmonics are simulated and tested. The actual hardware model of voltage sag is built and the algorithm is validated again by the collected data. The results show that the method can quickly and accurately detect the onset time,depth and phase of voltage sag.

关 键 词：延迟小角度 电压跌落 PARK变换 复合形态滤波器 

分 类 号：TM761[电气工程—电力系统及自动化]