基于求导法的dq变换结合形态学滤波的电压暂降检测方法  

Single phase voltage sag detection method based on derivation αβ-dq transformation combined with morphological filter

作　　者：周军[1] 伏修来 李曙光[1] Zhou Jun;Fu Xiulai;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3期19-25,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);吉林省发改委产业开发技术专项基金支持项目(2019C057-3)

摘　　要：电压暂降是电力系统中频繁出现的严重电能质量问题,而传统的电压暂降检测方法在实时性和精确性上仍有不足,对此提出一种基于形态学滤波器和求导法αβ-dq变换的单相电压暂降快速检测方法。详细分析了基于求导的αβ-dq变换法检测原理,通过比较不同结构元素的形态滤波器的性能,选取合适的结构元素的形态滤波器滤除系统谐波和噪声,提高算法的精确性。使用软件仿真分析,并通过使用该方法分析实验室搭建的模拟电压暂降模型采集到的数据,进一步对该方法进行验证,结果表明该方法可以快速、准确地检测出电压暂降的幅值、持续时间和相位变化。Voltage sag is a serious power quality problem which frequently occurs in power system,but traditional voltage sag detection methods still have deficiencies in rapidity and accuracy.So this paper proposes a fast single-phase voltage sag detection method based on morphological filter combine with differential coefficientαβ-dq transformation method.The principle of derivativeαβ-dq transformation method has been analyzed in detail,and then,the appropriate morphological filter is chosen by comparing the ability of morphological filter with different structure element in order to filter harmonic and noise which is generated by power system,so the accuracy of algorithm could be improved.This method is further verified by software simulation and analysis and data collected from the simulated voltage sag model built in the laboratory.The results show that this method can detect the amplitude,the onset time and the phase of voltage sag quickly and accurately.

关 键 词：求导法 电压暂降 αβ-dq变换 形态滤波 幅值相位 

分 类 号：TM761[电气工程—电力系统及自动化]