一种适用于单相电压的改进电压暂降检测算法

针对目前电压暂降检测方法存在的的精确性低、实时性较差的缺点,提出了一种基于改进dq变换与顺序形态滤波器相结合的暂降检测新方法。研究论述了改进dq变换用于电压暂降检测的算法基本原理,介绍了顺序形态学概念,并由此基础设计了形态学滤波器,同时阐述了滤波器参数的选取方法。通过设置不同的信噪比与超前角度,仿真论证了新方法在理想条件和非理想条件下的暂降检测效果,并与传统方法进行了比较和分析。证明了新方法可以更高效精确地检测到暂降的特征值和起止时间。

Improved voltage sag detection algorithm for single phase voltage

Aiming at the shortcoming of low accuracy and poor real-time performance of voltage sag detection method,a new method based on improved dq transform and sequential morphological filter is proposed.Basic principle of improved dq transform for voltage sag detection algorithm is researched,the concept of order morphology is introduced.And thus,the morphological filter is designed,and the method of selecting filter parameter is expounded.By setting different signal noise ratio and leading angle,the simulation results show that the new method can detect the sag under ideal condition and non-ideal condition.It is proved that the new method can detect the eigenvalues and the stopping time of the sag more efficiently and accurately.