三相电压跌落检测新方法

An Advanced Detection Method for Three-phase Voltage Sag

为实现三相电压跌落的快速精确检测,提出含稳态分量和补偿分量的解耦检测方法。首先运用瞬时对称分量法在坐标系中推导出基波电压正序、负序分量的解耦检测模型;然后根据该解耦模型构建含稳态分量和补偿分量的离散卡尔曼滤波器,采用数学形态滤波器和网格分形方法定位电压突变发生和恢复时刻,并重置卡尔曼滤波器参数以加快检测动态响应速度;最后将提出的检测方法用于各种电压故障情形下的检测和动态电压恢复器（dynamic voltage restorer,DVR）补偿仿真中。仿真结果表明,所提方法的检测动作时间为2~3个采样周期,与传统dq变换法相比,其动态响应速度快一个数量级,证明了所提解耦检测方法在响应速度、稳态精度方面具有优越性。

Aiming at the problem of detecting three-phase voltage sag quickly and accurately,a novel decoupled detection method with steady-state and compensation components was presented.Firstly,a decoupled model for fundamental voltage positive and negative sequence components was built on the stationary and orthogonal ？？ reference frame based on instantaneous symmetrical components;according to the presented model,the Kalman filter with steady-state and compensation components was constructed.Afterwards,mathematical morphological filter and grille fractal were adopted to detect voltage step change,and then,reset the parameters of Kalman filter to accelerate transient response.Finally,the proposed method was used for different faults detection and DVR compensation.Simulation results show that the response time is just 2~3 sample times,ten times faster than dq method,and verify that the proposed method has advantages of detection response time and accuracy.