基于S变换的高压直流输电故障诊断

HVDC System Fault Diagnosis Based on S-transform

在研究采用S变换提取的信号的幅频特性和相频特性基础上,提出了一种基于S变换的高压直流输电故障诊断方法。通过对故障信号进行S变换(一种可逆时频局部分析方法,能有效提取信号的时频特征)后,提取故障特征量,融入构建的故障识别指数,利用识别指数所在值域来判断故障类型。该方法已经在高压直流系统各类型故障中进行了仿真测试,表明是有效可行的。

Based on the research of the amplitude-frequency and phase-frequency characteristics derived from the signals through S-transform,a fault diagnosis method based on S-transform is proposed for HVDC system.S-transform is a reversible time-frequency localization analysis method which can effectively acquire the time-frequency characteristics.By applying S-transform to the fault signals,the fault characteristics are derived and combined into the constructed fault diagnosis index,then the value range of fault diagnosis index is referred to in order to identify the fault type.The presented method has been simulated and tested for various types of HVDC faults and proved effective and practical.