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Frequency is one of important parameters of power system, real-time and accurate detection of power grid frequency are necessary for steady-state control and relay protection of power system. Traditional algorithms based on Discrete Fourier Transform or improved Discrete Fourier Transform, requiring for large amount of data, having complex calculations and poor dynamic characteristics, are difficult...
This paper presents an adaptive data window algorithm for fast and accurate fundamental phasor estimation of voltage and current signals. The proposed approach is based on weighted least error square method. A forgetting factor is used to weight the older samples with smaller values in cost function computation. Thereby, the digital filters inertia would be reduced, which provides faster dynamic response...
In protection relaying schemes, the digital filter unit plays the essential roles to calculate the accurate phasor. However, the decaying DC components in fault currents always cause false operations of relay systems. This paper presents a new filter scheme which can remove such components from fault currents. Using the proposed scheme, the full-cycle DFT (FCDFT) only needs one-cycle samples to obtain...
This paper presents a new method for the removal of decaying dc offset from current signals in digital protective devices. The method is based on the fact that a purely sinusoidal signal has a zero average over a full cycle or multiples of the full cycle of its fundamental frequency, whereas an exponential signal has a nonzero average over that same interval. A full cycle plus one sample of post fault...
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