Grid frequency estimation using Rife-Vincent Class I Window based Discrete Fourier Transform

This paper presents the performance analysis of the frequency estimation technique based on the Discrete Fourier Transform (DFT) for single-phase grid voltage waveform under distorted grid conditions. Time varying fundamental frequency estimation requires three DFT operations. In this work, different types of fixed size windows by utilizing a special type of window function called Rife-Vincent window of class I are used for the DFT operations. The fixed size window based DFT operations are implemented as finite impulse response (FIR) filters. The frequency responses of the FIR filters using different windows are shown in this paper. Matlab/Simulink software is considered for the simulations. All the simulation results show that the presented technique does not have stability issue as it is an open loop based technique, and it can successfully estimate the grid fundamental frequency.