基于改进正交匹配追踪的电压暂降数据压缩及重构方法  

Compression and Reconstruction Method of Voltage Sag via Improved Orthogonal Matching Pursuit

作　　者：李新 武利会 范心明 董镝 宋安琪 LI Xin;WU Lihui;FAN Xinming;DONG Di;SONG Anqi(Guangdong Power Grid Company of Limited Liability Foshan Power Supply Bureau,Foshan 528000,China)

机构地区：[1]广东电网有限责任公司佛山供电局,广东佛山528000

出　　处：《供用电》2021年第5期48-55,共8页Distribution & Utilization

基　　金：广东电网有限责任公司科技项目(GDKJXM20180049)。

摘　　要：随着电压暂降问题的关注度日益提高,在配电网中大量装设监测装置是必然的发展趋势。但电压暂降的暂态过程复杂,监测数据稀疏性差,需要较高的采样精度才能完整地保留原始信号中的信息,这为数据的采集、存储、传输带来了新的挑战。为了减少采样数据量,并以高概率恢复电压暂降信号,同时满足电能质量研究的数据精度要求,提出一种基于改进正交匹配追踪(orthogonal matching pursuit,OMP)的电压暂降数据压缩及重构方法。通过优化OMP算法迭代条件,克服了传统OMP算法需要信号稀疏度先验的瓶颈;并且使用了关键帧插值重构的方法,提高了OMP算法对于暂态信号的特征重构效果,还利用分段运行策略,大幅提高了重构效率。经某电网电能质量监测装置实测数据验证,所提方法能以低于35%的高压缩率有效压缩电压暂降监测数据,并以较高的精度和效率重构信号。With the increasing attention to the problem of voltage sags,it is an inevitable development trend to install a large number of monitoring devices in the distribution network.However,the transient process of voltage sags is complicated,and the monitoring data is poorly sparse,so to retain the full information in the original signal requires higher sampling accuracy,which brings new challenges to data collection,storage,and transmission.In order to reduce the amount of sampled data and restore the voltage sag signal with high probability,and to meet the data accuracy requirements of power quality research,this paper proposes a voltage sag data compression based on improved orthogonal matching pursuit OMP(orthogonal matching pursuit)and refactoring method.In this paper,we optimize the iterative conditions of the OMP algorithm,overcome the traditional OMP method overcomes the prior bottleneck of the signal sparsity of the signal required of the traditional OMP method,and use the key frame interpolation reconstruction method to improve the feature reconstruction effect of the OMP algorithm for transient signals.Using the segmented operation strategy greatly improves the reconstruction efficiency.Verified by the measured data of a power quality monitoring device in a power grid,the method proposed in this paper can effectively compress the voltage sag monitoring data with a high compression rate of less than 35%,and reconstruct the signal with higher accuracy and efficiency.

关 键 词：压缩感知 电压暂降 关键帧 信号重构 OMP重构算法 

分 类 号：TM71[电气工程—电力系统及自动化]