Measurement of Instantaneous Power Quality Parameters Using UWPT and Hilbert Transform and Its FPGA Implementation

Abstract

This article presents a measurement technique based on the undecimated wavelet packet transform (UWPT) and Hilbert transform (HT) to estimate power quality parameters at every sample. Thus, it results in improved time resolution and allows us to track the variation of power quality parameters with respect to time. The proposed technique consists of three stages. In the first stage, harmonics and fundamental components are separated from the distorted signal using UWPT. In the second stage, the HT is used to extract the envelope of fundamental and harmonic components. In the last stage, power quality parameters are calculated at each instant according to the IEEE Standard 1459-2010. The proposed scheme has been successfully implemented on the Xilinx Virtex-6 FPGA ML-605 evaluation kit. The simulation and the experimental results demonstrate the effectiveness of the proposed method in terms of estimation accuracy, timing requirements, and resource utilization.