【摘要】 针对电压暂降扰动的准确定位与精确测量问题,提出结合小波变换与能量算子的暂降检测新方法。该方法通过小波变换将被检测电压暂降扰动分解成近似信号和细节信号两部分。在细节信号部分精确定位扰动发生起止时刻;对近似信号运行能量算子,能快速准确测量到暂降幅值。所提方法中小波变换兼具滤波效果,减弱或去掉低频暂降信号中的高频扰动成分,从而提高能量算子的抗干扰性和计算精度。仿真和实验结果验证了算法的有效性。更多还原

【Abstract】 This paper proposes a novel hybrid wavelet-energy operator method for accurate voltage sag detection and measurement.In the proposed method,the voltage sag is decomposed into two signal parts by wavelet transform: one is a detail signal,the other is an approximation signal.And in the detail signal,the start time and the end time of the sag signal can be detected.By applying an energy operator to the approximation signal,the temporary sag decline in value can be measured accurately and quickly.At the same time,the wavelet transform(WT) in this method acts like a filter.WT can weaken or remove the high frequency disturbance from voltage sag to enhance the noise immunity and accuracy of the energy operator.Simulation and experimental results verify the effectiveness of the algorithm.更多还原