基于三维偏振椭圆参数的电压暂降分类和定位方法研究

Research on voltage sag classification and localization method based on three-dimensional polarization ellipse parameters

针对现有电压暂降定位方法的实时应用问题,文章提出了一种新的电网对称性和非对称性故障触发电压暂降的分类和定位方法。该方法利用三维坐标系下三相电压信号映射得到三维偏振椭圆(PE)的5个独特参数,通过5个椭圆参数构造的参数方程确定决策边界,对断层引发的暂降进行了分类,最终利用椭圆参数随距离变化的参数方程进行故障定位。所提出的算法在逐个周期的基础上对故障进行分类和定位,因此更适用于实时应用,可以保障电力系统正常运行。

Aiming at the problem of real-time application of existing voltage sag location methods,this paper proposes a new classification and location method for symmetric and asymmetric fault-triggered voltage sags in power networks.The method uses five unique parameters of 3D polarization ellipse(PE)mapped by three-phase voltage signal in 3D coordinate system,determines the decision boundary through the parameter equation constructed by five elliptic parameters,classifies the sag caused by fault,and finally locates the fault by using the parameter equation of ellipse parameters varying with distance.The proposed algorithm classifies and locates faults on a cycle-by-cycle basis,so it is more suitable for real-time applications to ensure the normal operation of the power system.