基于广义S变换的电压骤降特征量检测方法

为实现电压骤降信号特征量的准确检测，提出并建立了基于广义S变换的电压骤降特征量检测方法。介绍了广义S变换的基本原理，构建了电压骤降特征量的计算模型，给出了电压骤降特征参数的检测流程。对离散电压信号进行广义S变换，通过广义S变换的基波幅值曲线计算电压骤降幅值；由广义S变换的高频频谱幅值和曲线得到电压骤降起始、结束时刻和电压骤降持续时间；利用广义S矩阵的相位矩阵计算得到电压骤降相位跳变值。仿真实验验证了方法的准确性。与现有检测方法相比，基于广义S变换的电压骤降特征量检测方法计算量小，准确度高，抑制噪声干扰与谐波影响效果好。

Research on detection method for voltage sag characteristics based on generalized S-transform

To realize the detection of voltage sag characteristics, a novel detection method for voltage sag characteristics based on the generalized S-transform is proposed. The generalized S-transform principle is briefly introduced, the computation model of voltage sag characteristics is constructed, and the voltage sag characteristics estimation scheme is given. The discrete voltage signal is submitted to the generalized S-transform, whose fundamental magnitude data is used to calculate the magnitude of the voltage sag. The sum of high frequency spectrum magnitudes of the transform result gives the moments when the sag starts and ends along with its duration. And the fundamental phase data of the transform result computes the phase angle jump of the voltage sag. The simulation results show that the proposed method is simple and effective. The proposed method is of higher accuracy than other methods, and is robust against noises and harmonic interferences.