一种新的电压暂降检测方法

New method to detect voltage sag

对电压暂降特征量的快速检测是动态电压恢复器(dynamic voltage restorer,DVR)实现电压补偿的前提。介绍了几种典型的电压暂降检测方法,对广泛采用的αβ变换法进行了详细的分析,在此基础上提出了一种新的检测方法,该方法通过锁相、低通滤波器等环节可快速推导出基波电压的有效值及相位。较之于传统的αβ变换法,该方法的延时明显减少,因此可以提高DVR的动态性能。仿真结果证实了该方法的有效性。

Fast detection of voltage sag characteristics is the premise for dynamic voltage restorer （DVR） to compensate voltage correctly. Detection methods for voltage sag have been summarized, and on the basis above a new detection method is presented. With this method, the amplitude and phase of its foundation component can he derived rapidly with PLL and LPF. Compared with typical 0/3 transformation, the time delay is observably reduced which leads to better dynamic performance of DVR. Simulation results verify the validity of the method.