电力系统保护与控制Issue(9)：62-68,7.
一种改进不完全S变换的电压暂降检测方法
Detection of voltage sag by a modified incomplete S-transform
摘要
Abstract
In order to realize the detection of voltage sag fast and accurately, a novel method for detecting voltage sag by a modified incomplete S-transform is proposed. The main idea of the method is as follows: first of all, the fast Fourier transform of the voltage signal sampled from the power network is made to obtain the main frequency points of the signal. And then, the modified S-transform of each frequency point is performed to attain the components of main frequency characteristic quantities. Finally, an implementation of the detection of the characteristic quantities of voltage sag is carried out by the components. The principles of the proposed modified incomplete S-transform and the choice of the parameters are described, and then the extraction method of the features of voltage sag is stated in detail, and finally the practical signals are simulated. The obtained results show that the characteristic quantities such as the amplitude, duration and a sudden change of the phase of voltage sag can be extracted by the proposed method, and that it is characterized by high precision, less computation and good anti-interference performance. This work is supported by National Natural Science Foundation of China (No. 60962008).关键词
电压暂降/改进不完全S变换/高斯窗函数/特征量/时频分析Key words
voltage sag/modified incomplete S-transform/Gaussian window function/characteristic quantity/time-frequency analysis分类
信息技术与安全科学引用本文复制引用
肖助力,龚仁喜,陈双..一种改进不完全S变换的电压暂降检测方法[J].电力系统保护与控制,2015,(9):62-68,7.基金项目
国家自然科学基金(60962008) （60962008）
