Proceedings ArticleDOI
Estimation and elimination of DC component in digital relaying
K Venkatesh,K.S. Swarup +1 more
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TLDR
In this paper, the authors proposed a new decaying DC component estimation algorithm for digital relaying, which can estimate and eliminate the DC decaying component from fault current signals after one cycle from the fault instant.Abstract:
This paper propose a new decaying DC component Estimation algorithm for digital relaying. Fault currents tend to include a DC decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the DC decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the DC decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The DC decaying component is eliminated by subtracting the DC value at each sampling instant. To verify the performance of the proposed algorithm, we performed a DC component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate DC components exactly from fault currents and can be applied to digital protection relays for phasor extractionread more
Citations
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Robust Frequency, Phase, and Amplitude Estimation in Power Systems Considering Harmonics
TL;DR: In this article, a two-step framework was proposed to estimate the voltage and current parameters for both single-phase and three-phase power systems including harmonics and interharmonics.
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Real-time electrical variables estimation based on recursive wavelet transform
TL;DR: In this article, the authors proposed a new recursive algorithm for accurate and fast estimation of the instantaneous electrical variables such as frequency, amplitude and phase angle, which provides an improvement over the existing recursive wavelet transform and therefore is called IRWT.
Journal ArticleDOI
Selective estimation of harmonic components in noisy electrical signals for protective relaying purposes
TL;DR: In this article, a new digital filter for selective estimation of harmonic components in noisy electrical signals for protection relaying purposes is presented, which is suitable for use in a digital relay if it rapidly and precisely responds to these types of signals.
Proceedings ArticleDOI
An effective filtering algorithm to mitigate transient decaying DC offset
Abouzar Rahmati,Reza R. Adhami +1 more
TL;DR: In this paper, the Fourier transform is used to estimate the amplitude of the fundamental frequency with high accuracy, and the proposed method is able to mitigate any level of decaying dc offset in one cycle and there is no need to any more time for its calculation.
Proceedings ArticleDOI
A novel real-time based phasor and frequency estimator capable of measurements under transient conditions
TL;DR: In this paper, the authors proposed a new recursive algorithm for accurate and fast estimation of the instantaneous electrical variables such as frequency, amplitude and phase angle, which provides an improvement over the existing recursive wavelet transform and therefore is called IRWT.
References
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Book
Computer Relaying for Power Systems
Arun G. Phadke,James S. Thorp +1 more
TL;DR: In this paper, the authors present a comprehensive, up-to-date account of computer relaying in power systems, based in part on the author's extensive experience in the field.
Journal ArticleDOI
Removal of DC-offset in current waveforms using digital mimic filtering
TL;DR: In this paper, the capability of popular digital filters used in relaying applications to suppress DC offset in current waveforms over a broad range of time constants as encountered on real power systems was investigated.
Journal ArticleDOI
Removal of DC offset in current and voltage signals using a novel Fourier filter algorithm
Jyh-Cherng Gu,Sun-Li Yu +1 more
TL;DR: In this paper, the authors present a Fourier algorithm to remove the DC offset in a voltage or current signal, which reduces the precision and convergence speed of the DFT and decomposes the accurate fundamental frequency components.
Journal ArticleDOI
Simplified algorithms for removal of the effect of exponentially decaying DC-offset on the Fourier algorithm
TL;DR: In this article, a new algorithm to eliminate the error caused by this decaying component in the Fourier algorithm has been proposed, and three simplified methods are proposed to alleviate the computation burden.
Journal ArticleDOI
Application of combined adaptive Fourier filtering technique and fault detector to fast distance protection
TL;DR: In this paper, a combined adaptive Fourier filtering technique and fault detector is proposed for fast distance protection of transmission lines, which is extended from the Fourier filters and can be applied under arbitrary data window length.