A novel integrated morphology-wavelet filter algorithm used for ultra-high speed protection of power systems is proposed in this paper. This algorithm aims to improve the filter performance when such filter is applied to filter the random and pulsed noises contained in the travelling wave. By use of the preset filter unit based on mathematical morphology, the wave-head of the travelling wave is held, meanwhile a variety of noises existing in such travelling wave can be greatly suppressed. Wavelet transform provides such algorithm that the travelling wave head can be detected and accurately located by use of it. On basis of the above integrated filter algorithm, various kinds of protections based on travelling wave or transient component can be implemented. The effectiveness of this algorithm is testified with Simulations based on ATP program. It should be indicated that this integrated morphology-wavelet filter algorithm has less computational complexity than single low-pass filter and multi-resolution waveform transform, which makes it possible to be implemented in industrial product.
Proceedings of the CSEE