DSP implementation of the empirical wavelet transform for measurement of power quality indices

Abstract

The hardware implementation of Empirical Wavelet Transform (EWT) for the estimation of the IEEE Standard 1459-2000 definitions is presented in this paper. The estimation of single-phase power quality indices (PQIs) using the EWT technique is implemented on a floating point digital signal processor TMS320F28377S. The EWT decomposes the signal into its frequency components adaptively; however, the estimation of PQIs require only the fundamental and non-fundamental components. Therefore, the algorithm aims to extract only the fundamental frequency component accurately by designing an adaptive wavelet filter. The accuracy and practicality of the EWT-based PQIs measurement have been verified by testing on practical signals acquired in the laboratory. Experimental results of the DSP-based PQIs are compared with the results obtained from MATLAB in terms of computational time as well as accuracy. © 2017 IEEE.