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Managing Sinusoidal Signal Having Frequency Excursion Accomplished with High Order Harmonic

A new scheme for measuring the amplitude value of the fundamental component of a distorted sinusoidal signal for power system applications is presented. The method is applicable to single-phase as well as three-phase systems by controlling sampling start angle to improve the measurement precision of signal amplitude. While maintaining structural simplicity, the proposed scheme is highly robust with respect to noise, high order harmonics, transient distortions and frequency excursion in amplitude and frequency of power systems. The method is suitable for environments that frequency excursions are experienced and conventional discrete Fourier transform (DFT)-based methods do not provide satisfactory results. Speed and accuracy of the response can also be controlled. Performance of the proposed method is presented based on simulation studies in the MATLAB environment and an experimental setup