基于GST的煤矿电能质量扰动特性分析

针对我国现代化矿井的发展现状,阐述煤矿主要存在的4种暂态扰动信号的产生原因及特征,结合广义S变换(GST,generalized S-transformation)在分析电压幅值、持续时间及频率等方面的优越性,从不同角度提取模时频矩阵(MTFM,module time-frequency matrix)中频域和时域的有用特征,对4种暂态扰动信号:电压暂降、电压暂升、电压波动和电力谐波进行仿真分析.Matlab结果表明,基于GST的MTFM特征量提取方法能有效地检测到扰动的幅值突变、持续时间及频率变化,高频检测能力好.这些不同的特征可为进一步煤矿电能质量的扰动识别以及综合治理打下基础.

Characteristics Analysis of Power Quality Disturbance for Coal Mine Based on GST

According to the present situation of the development of modernization coal mine,the causes and characteristics of the main four types of transient disturbance signals in coal mine are described.Combined with the superiorities of GST in analyzing the voltage amplitude,duration and frequency,the useful characteristics of time-frequency domain are extracted from module time-frequency matrixes(MTFMs).Four kinds of transient disturbance signals i.e. voltage sag,voltage rise,voltage fluctuation,and harmonic,are simulated by Matlab.The results of Matlab simulation show that this method can detect amplitude mutation,duration and frequency changes of the distarbance effectively,and has good ability of high frequency detection.These different characteristics can be used for further power quality disturbance recognition and comprehensive treatment.