Dwt Analysis of Selected Transient and Notching Disturbances

− This paper is focused on the problem of transient and notching analysis occurring in electric power system. The aim of the research was to improve DWT algorithm especially for transient detection, in order to increase performance of a multi-parameter DSP system. The method described in the paper proposes rejecting insignificant wavelet decomposition stages and takes only these stages for reconstruction transient or notching, in which predominant energies were detected. The criterion of rejecting stages is that the frequency band of disturbances reconstructed in this way should be sufficient for further evaluation. The proposal is similar to idea of data compression by DWT. All analyses are based on the real voltage samples, registered in the real isolated electric power system, namely ships’ systems. Finally, the results of the research are presented and commented on.