基于电场强度测量的电网运行安全检测

Research on Power Grid Operation Safety Detection Based on Electric Field Strength Measurement

为有效减少电网运行安全事故的发生,研究基于多维电场强度测量的电网运行安全检测方法。利用三维球形传感器电场强度测量仪采集电场强度信号,通过贝叶斯估计算法融合采集到的电场信号数据,经二代小波变换去除电场强度信号噪声;采用分段聚合近似表示法提取去噪后的电场强度信号特征向量,得到时间序列特征,将其输入至支持向量机分类器中识别电压强度等级,并对比所获电压等级与报警阈值,判断电网运行区域是否存在风险。试验结果表明:该方法采集的电场强度信号与实际电场强度的误差保持在2%以内,电压等级识别准确率平均为97.3%。

To effectively reduce the occurrence of power grid operation safety accidents,a power grid operation safety detection method based on multi-dimensional electric field strength measurement is researched and developed.The three-dimensional spherical sensor electric field intensity measuring instrument is used to collect electric field intensity signal,the collected electric field signal data is then fused by Bayesian estimation algorithm,and the noise of electric field intensity signal is removed by second generation wavelet transform.The feature vectors of the denoised electric field intensity signals are extracted with the piecewise polymerization approximate representation method,and the time series features are obtained,which are then input into the support vector machine classifier to identify the voltage intensity levels.The obtained voltage level is compared with the alarm threshold to judge whether there is a risk in the power grid area.The experimental results show that the electric field intensity curve collected by this method almost coincides with the actual electric field intensity curve,and the data denoising effect is good.It can detect different levels of risks in the process of power grid operation and reduce the occurrence of power grid operation risk accidents.