形态滤波器结合DSOGI-PLL电压暂降检测法

Voltage Sag Detection Method Based on Morphological Filter Combined with DSOGl-PLL

电压暂降的快速检测是备用电源迅速投入电网的前提。为此,提出一种适用于备用电源无缝切换工作特性的电压暂降检测算法,以形态滤波器中的自适应复合形态滤波器对电压信号进行滤波,将滤波后的信号经过双二阶广义积分器锁相环处理实现三相不平衡电压的正、负序解耦,从而完成电压暂降的快速检测。仿真结果表明,检测时间小于6 ms,收敛性好,满足了速度性与实时性的要求。检测方法在并网和备用电源等方面有较大应用价值。

The rapid detection of voltage sag is the premise for the backup power to be quickly put into the power grid.Therefore,a voltage sag detection method was proposed to solve the problems of rapidity and real-time performance of the current detection algorithm.The voltage signal was filtered by the adaptive composite morphological filter in the morphological filters,and the filtered signal was processed by a phase-locked loop of a dual second-order generalized integrator to realize the separation of the positive sequence and the negative sequence of the three-phase unbalanced voltage,so as to complete the rapid detection of voltage sag.The simulation results show that the detection time of the method is less than 6 ms,the convergence is good,and it meets the requirements of speed and real-time performance.The detection method has great application value in grid.