Accurate Real-Time Measurements of the Smart Grid Phasor Measurement Unit Parameters

Accurate and real-time measurement of the power system signals’ phasor is an open challenge in future smart grids. This article analyzes the performance of three recently proposed phasor estimators and compares them with the proposed estimator algorithm. The article proposes an improved recursive wavelet transform for real-time estimation of phasor and frequency in smart power systems. The proposed algorithm performance is compared with the commonly used full-cycle discrete Fourier transform (DFT), the improved discrete Fourier transform, and the wavelet transform based methods. It is shown that improved recursive wavelet transform possesses an improvement over a wide range of decaying DC components, harmonic distortions, frequency deviations, and sampling frequency. These characteristics of the improved recursive wavelet transform make it a good candidate for real-time applications in any smart power system.