基于S-G滤波的电流互感器饱和检测

Current transformer saturation detection based on Savitzky-Golay filter

针对目前传统基于差分方程的电流互感器饱和检测方法易受噪声影响的问题,提出了一种基于SavitzkyGolay(S-G)滤波器的电流互感器饱和检测新方法。该方法将传统的差分方程和S-G滤波器相结合,可在信噪比较低的情况下准确检测出电流互感器的入饱和点。在电流互感器入饱和点准确检测的基础上,电流积分法可用于检测电流互感器的出饱和点。推导了差分方程结合S-G滤波器后的相关阈值,并使用PSCAD/EMTDC对新方法进行了仿真测试。仿真结果表明:基于S-G滤波的电流互感器饱和检测方法具有算法简单、检测精度高、抗噪声干扰能力强等优点。

new method of current transformer saturation detection based on Savitzky-Golay(S-G)filter is proposed.The method combines the traditional difference equation and the S-G filter,can accurately detect the saturation point of the current transformer in the condition of low signal noise ratio.On the basis of current transformer saturation start time,the current integration method can be used to accurately detect the end of current transformer saturation.The threshold value of the differential equation method combined with the S-G filter is derived,and the new method is simulated by PSCAD/EMTDC.The simulation results show that the current transformer saturation detection method based on S-G filter has the advantages of simple algorithm,high detection precision,strong anti-interference ability and so on.