基于空间矢量的单相电压暂降检测方法

电压暂降检测对电能质量分析和控制具有重要意义.提出一种基于电压空间矢量的单相电压暂降检测方法.通过对三相电压信号进行Clark变换,结合Euler公式构造三相电压空间矢量,根据空间矢量在复平面上的椭圆轨迹进行电压暂降的检测并识别出故障相.由椭圆长半径、短半径和倾斜角求出电压暂降过程中电压相位角跳变值,根据相位角跳变值对原始电压数据进行移相,最后计算出电压暂降深度.仿真实验取得了良好效果,表明该方法具有一定的应用价值.

A new detection method for single-phase voltage sag based on space vector

Detection of voltage sag is of great significance for monitoring and controlling of power quality.A new detection method was presented in this paper which was based on the voltage space vector for single-phase voltage sag.Firstly,the space vector was constructed by applying Clark Transform and Euler Formula to the three-phase voltage signals.Based on the established space vector,the method used the trajectory of the space vector on complex plane to detect voltage sag and identify the fault phase.At the same time,the phase angle jump could be calculated from the ellipse's major axis,minor axis and inclination angle.The original signal data was shifted according to the phase angle jump.Then the depth of voltage sag could be calculated rapidly.The simulation experiments got fair result which showed practical value of the proposed method.