电能质量暂态扰动的HS变换检测方法

Detection of power quality disturbances utilizing HS-transform

为提高电能质量暂态扰动检测定位能力,设计一种采用Hyperbolic S变换(HS变换)的扰动检测方法.在采用HS变换处理电能质量信号的基础上,通过计算HS变换模矩阵上各采样点不同频率对应的幅值之和来定位扰动起止点.新方法首先通过阈值对幅值和曲线进行预处理;之后,采用峰值点定位扰动起止时间.仿真实验证明,新方法实现了不同参数条件下电压暂降、电压暂升、电压中断、电磁脉冲、电压尖峰、电压切痕、振荡暂态等7种扰动的准确检测.该算法具有较好的鲁棒性与抗噪性,受不同扰动参数影响较小,符合实际环境下的扰动定位要求.

To improve the accuracy of disturbances detection and localization,a new approach based on Hyperbolic S-transform（HST） is constructed in this paper.After the modular matrix of power quality signal is calculated by the HST,the disturbance is detected and located by the sum of amplitudes of each sample point.The sum of amplitude is processed by threshold at first.Then,the points with the peak value are extracted for disturbances detection.The experimental results show that the new method realizes the accurate detection and localization of 7 types of disturbances including voltage sag,swell,interruption,pulse,spike,notch and transient.The simulation on ideal signals proves that the new method has the good adaptability and noise intensity.The extent of disturbances parameters has little impact on this proposed method.The method is very satisfied for disturbances location in real power system.