基于改进S变换的电压骤降自适应检测方法

吴言; 李建闽

吴言,李建闽.基于改进S变换的电压骤降自适应检测方法[J].电测与仪表,2019,56(3):111-115.
wuyan,lijianmin.Adaptive Detection Method for Voltage Sags with improved S-Transform[J].Electrical Measurement & Instrumentation,2019,56(3):111-115.

基于改进S变换的电压骤降自适应检测方法

Adaptive Detection Method for Voltage Sags with improved S-Transform

DOI：

中文关键词: 电压骤降改进S变换分段自适应抗噪声

英文关键词:Voltage sag modified S-transform(MST) piecewise self-adaptation resistance to noise

基金项目:

作者中文名	作者英文名	单位
吴言	wuyan	湖南大学电气与信息工程学院
李建闽	lijianmin	湖南大学电气与信息工程学院

摘要点击次数: 1460

中文摘要:

由于传统S变换（S-Transform,ST）在检测电压骤降问题是存在时频分辨率不高，计算量大的问题，本文在深入研究传统S变换（modified S-Transform,MST），给出了一种基于改进S变换的电压骤降自适应检测方法，可以准确、快速地实现电压骤降参数的准确提取。本文首先给出MST中调节因子的取值依据并用实验分析法给出调节因子的取值范围；而后依据调节因子的取值分布情况，提出分段的调节因子；最后基于调节因子取值函数，建立自适应检测方法。本文在MATLAB上对本文算法进行仿真，能够准确的检测出电压骤降参数，且抑制噪声和谐波影响的效果好。实际构建的硬件测试平台验证了本文算法的正确性和可行性。

英文摘要:

Since the low time-frquency resolation and heavy computation of S-transform when comes to detecting voltage sags,the modified S-transforn(MST) algorithm was established.Voltage sag parameters are obtained with MST in a higher resolation and speed.Firstly,the standard of adjusting factors in MST are given, and the values of adjusting factors are given by experimental analysis;Secondly,according to the distribution of the adjustment factor, the adjusting factor of piecewise is proposed.Finally,the adaptive detection method is established based on the function of adjusting factor.The simulation and test results show that the proposed method provids results with higher accurcy in time-frquency anaysis,and is appropriate for accuate and rapid detection of voltage sags.

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