Comparison between two versions of the discrete wavelet transform for real-time transient detection on synchronous machine terminals

Abstract

The wavelet transform is a powerful tool for real-time detection of transients on synchronous machine terminals which can be used into the control strategy of a power system stabilizer in order to preserve the power system stability. The main goal of this paper is to identify the faster detection of transients in synchronous generator terminals by using the real-time wavelet coefficients of both the discrete wavelet transform (DWT) and maximal overlapped discrete wavelet transform (MODWT), as well as identify the best mother wavelet for this purpose. Faults with very damped transients were obtained through an experimental system composed of an actual synchronous generator connected to a simplified power system and good results were obtained, showing the efficacy of the wavelet transform for real-time fault detection.