Monitoring HVDC systems using wavelet multi-resolution analysis

The paper presents a disturbance classification technique based on wavelet multi-resolution analysis. The wavelet multi-resolution transform is introd uced as a tool for providing discriminative, translation-invariant features with small dimensions to classify different disturbances in an HVDC transm ission system. The proposed method extracts features from signals monitored on both DC and AC sides of the HVDC system. It is shown that monitored sig nals show promising features that can classify different disturbances that may occur anywhere in the HVDC system.