【摘要】 提出了一种新的基于小波变换的单相接地故障电弧建模方法及仿真研究。利用PSCAD/EMTDC中的逻辑判断,传递函数等模块,准确建立了一次、二次电弧动态特性的模型控制块,将其封装嵌入至输电线路模型界面中,实现了实时控制,并将DB5离散小波变换应用于检测故障电弧故障信号奇异性。经过大量的仿真实验表明,该方法可以有效提取故障电弧信号的高频分量,并能迅速检测出电弧信号的所有异常信息和准确地识别出电弧的熄灭时间。更多还原

【Abstract】 In this paper,a newalgorithm of arc modelling of single phase earth fault based on wavelet transform is proposed and simulated.The logic judgments,transfer function and other modulesin the PSCAD/EMTDC are used to accurately establish model control blocks of dynamic characteristics of primary and secondary arc.And then they are packaged and embedded to the interface of transmission line model,which can realize real-time control.At the same time,the DB5discrete wavelet transform is applied to arc fault signal strangeness detection.Alarge number of simulations show that the method can effectively extract high-frequency component of fault arc signal,and can quicklydetect all the abnormal information of arc signal and can accurately identify the arc quenching time.更多还原