一种高鲁棒性雷击干扰与故障识别方法研究

Research on a Highly Robust Lightning Disturbance and Fault Identification Method

为准确可靠识别雷击干扰和故障,提出了一种基于扰动电压波形包络图构造积分判据的方法。首先提取母线电压中的扰动电压波形,然后分别拟合扰动电压波形于时间轴上、下方的包络线,进而根据得到的包络线计算积分面积,最后利用波形对称度识别雷击干扰和故障。ATP—EMTP软件仿真计算表明:扰动电压波形在时间轴上、下方的积分相近,可判定为雷击干扰,反之为雷击故障,且所述方法能够避免波形记录装置采样频率低、雷电流幅值和故障点位置等因素的影响,具有很高的鲁棒性。研究结果为工程实际中辨识雷击干扰和故障提供了参考指导。

To accurately and reliably identify lightning disturbances and faults,a method for constructing integral criterion based on the disturbance voltage waveform envelope is proposed. Firstly,the disturbance voltage waveform in the bus voltage is extracted,and the envelopes of the disturbance voltage waveform on the upper and lower sides of the time axis are respectively fitted,and then the integral area is calculated according to the obtained envelope,and finally the lightning disturbance and fault are identified by the waveform symmetry.The ATP-EMTP software simulation calculation shows that the integrals of the disturbance voltage waveform on the time axis and below are similar,which can be judged as lightning strike disturbance,otherwise it is a lightning strike fault. The method can avoid the influence of factors such as the low sampling frequency of the waveform recording device,the amplitude of the lightning current and the position of the fault point. It has high robustness. The research results provide reference guidance for the identification of lightning disturbances and faults in engineering practice.