Study of traveling wave filter of HVDC transmission line based on mathematical morphology

The paper firstly analyzes the main components of noise of traveling wave of HVDV transmission lines, then on the basis of comprehensively introducing the basic principle of mathematical morphology, puts forward a new multiresolution morphological filter algorithm on mathematical morphology. This kind of algorithm regulates the width of the structure element and makes the continuous morphological transform of signal, having well kept the main characteristic of the original signal. The simulation results have proved that the algorithm not only have excellent filter capability for various kinds of noises of traveling wave of HVDC, but also the computational speed is quick, it is easily realized on hardware and have very good practical value.