Journal Article

Differentiation filter-based technique for robust estimation of single-phase grid voltage frequency under distorted conditions

Reza, Md. Shamim, Ciobotaru, Mihai, Agelidis, Vassilios G.

2014

Overview

This study proposes a robust estimation technique for the single-phase grid voltage fundamental frequency under grid disturbances. The technique relies on a demodulation method and a finite-impulse-response-based differentiation filter (DF). A frequency domain analysis for designing the DF is presented and is used to estimate the time-varying fundamental frequency from the instantaneous phase angle obtained by the demodulation method. The technique can reject the negative effects caused by the presence of DC offset and harmonics. The proposed DF shows less sensitivity to the presence of oscillations caused by the demodulation method when compared to a similar finite-impulse-response-based DF. Simulation and experimental results are provided to verify the performance of the proposed technique.

• Publisher: The Institution of Engineering and Technology,Institution of Engineering and Technology,The Institution of Engineering & Technology
• Subject: Applied sciences / DC offset / Demodulation / demodulation method / DF design / Differentiation / Distortion / Disturbances / Electric potential / Electrical engineering. Electrical power engineering / Exact sciences and technology / finite impulse response‐based differentiation filter / FIR filters / frequency domain analysis / frequency estimation / grid disturbance / harmonic distortion / instantaneous phase angle / oscillation / Oscillations / power engineering computing / power grids / power harmonic filters / power system faults / Resonant frequency / robust single phase grid voltage fundamental frequency estimation / time‐varying filters / time‐varying fundamental frequency estimation / Voltage