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针对三相三线制系统,提出一种检测三相电压暂降的新方法。通过瞬时对称分量法在αβ静止坐标系下建立离散检测模型,引入90°超前移相算子,解耦了暂降电压正序、负序分量的检测;采用Sage-Husa卡尔曼滤波算法实现移相算子,产生正交分量,同时表现出算法自身的滤波功能;引入欧氏空间距离定位故障发生及恢复时刻,并重置卡尔曼滤波器参数,加快检测响应速度。仿真结果表明,所述方法在响应速度和稳态精度方面具有优越性,证明了该方法的可行性和有效性。
Aiming at the three-phase three-wire system, a new method to detect the three-phase voltage sag is proposed. The instantaneous symmetrical component method is used to establish a discrete detection model in the αβ stationary coordinate system. A 90 ° advanced phase shifting operator is introduced to decouple the positive and negative sequence components of the dips voltage. The Sage-Husa Kalman filter algorithm Phase shift operator to generate quadrature components, meanwhile, it shows the filtering function of the algorithm itself. The introduction of Euclidean distance to locate and recover the fault moment and reset the Kalman filter parameters to speed up the detection of response speed. The simulation results show that the proposed method is superior in response speed and steady state accuracy, which proves the feasibility and effectiveness of the proposed method.