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提升小波用于智能变电站电气设备 状态信号去噪研究

2020-08-03李巍代佰华伊瑞鹏王官涛刘博

现代电子技术 2020年8期

李巍 代佰华 伊瑞鹏 王官涛 刘博

摘  要: 智能化变电站电气设备在线监测信号需要快速处理及实时传输,针对这一问题,文中采用提升小波算法提取智能化变电站电气设备状态监测信号。该方法采用提升小波对信号进行分解,在阈值選择时采用基于SURE无偏估计的最优阈值自适应选择方法。对典型人工平稳信号及局部放电信号试验,结果表明,所提出的提升小波算法能够很好地滤除信号中的噪声,计算速度更快,具有良好的去噪效果和应用价值。

关键词: 信号去噪; 提升小波算法; 智能化变电站; 电气设备; 信号监测; 对比分析

中图分类号: TN830.1?34                           文献标识码: A                      文章编号: 1004?373X(2020)08?0082?04

Study on electrical equipment status signal de?noising of lifting wavelet algorithm applied to intelligent substation

LI Wei1,2, DAI Baihua2, YI Ruipeng2, WANG Guantao2, LIU Bo2

(1. Shandong University, Jinan 250000, China; 2. Binzhou Power Supply Company, State Grid Shandong Electric Power Company, Binzhou 256600, China)

Abstract: The on?line monitoring signal of electrical equipment in the intelligent substation needs to be processed quickly and transmitted in real time. To solve this problem, the lifting wavelet algorithm is used to extract the condition monitoring signals of the electrical equipments in intelligent substation. In this method, the lifting wavelet is used to decompose the signals, and the adaptive selection method of optimal threshold based on SURE unbiased estimation is adopted in the threshold selection. The testing results of typical artificially?smoothed signal and partial discharge signal show that the lifting wavelet algorithm proposed in this paper can filter out the noise in the signal well, and its calculation speed is faster. It has a certain de?noising effect and application value.

Keywords: signal de?noising; lifting wavelet algorithm; intelligent substation; electrical equipment; signal monitoring; contrastive analysis

0  引  言

在我国社会经济水平不断提升,社会发展进程不断加快的背景下,电网规模也随之扩大的同时加大了电网复杂度,而目前想要推动我国生产管理现代化发展所需,就应当确保电网能够安全稳定运行,所以建立智能化、信息化电网已经成为必然所趋[1]。变电站对于电网来讲,作为信息源及最终执行点,所以智能电网必须建立智能变电站,有助于推进智能电网的安全稳定及科学管理[2?4]。

智能变电站以“一次设备智能化,二次设备网络化”作为主要特征,实现一次设备的信号数字化输入输出,借助网路通信技术传输,对IEC61850标准适应[5?6]。但是由于智能变电站存在比较严重的现场电磁干扰情况,需要对所监测的信号进行去噪处理。文献[7?10]认为可以采用小波去噪法,文献[11]为了能够提高信号的数字化传输速率,实现快速化信号处理,认为小波算法可以不依赖傅里叶即可实现转换,并证实提升方式能够满足第一代变换。……

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