Journal ArticleDOI
Fast adaptive schemes for tracking voltage phasor and local frequency in power transmission and distribution systems
Innocent Kamwa,R. Grondin +1 more
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TLDR
Two new methods suitable for fast adaptive estimation of voltage phasor and frequency deviation are outlined, which could alleviate the computational burden and enhance the adaptation speed during transients.Abstract:
Devices specifically dedicated to highly accurate measurement of frequency have been described for specific applications like power system stabilizers. However, in most situations the digital estimate of the frequency deviation is needed concurrently with other decision quantities. Therefore, its value is usually obtained as a by-product of a more general-purpose algorithm, based, for instance, on the extended Kalman filtering or the recursive least error squares techniques. Unfortunately, a common problem with these Kalman filters is the high computational requirements, due to transcendental functions evaluation in real-time. Therefore, the need still exists for more clever implementations of the various real-time algorithms, which could alleviate the computational burden and enhance the adaptation speed during transients. To fulfil this need to some extent, two new methods suitable for fast adaptive estimation of voltage phasor and frequency deviation are outlined. >read more
Citations
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Journal ArticleDOI
Voltage phasor and local system frequency estimation using Newton type algorithm
TL;DR: A new approach to the design of a digital algorithm for voltage phasor and local system frequency estimation is presented using Newton's iterative method, which showed a very high level of robustness as well as high measurement accuracy over a wide range of frequency changes.
Journal ArticleDOI
Estimation of frequency and its rate of change for applications in power systems
TL;DR: In this paper, a new method for estimation of power frequency and its rate of change is presented, which is based on a newly developed quadrature phase-locked loop concept.
Journal ArticleDOI
A precise calculation of power system frequency and phasor
Jun-Zhe Yang,Chih-Wen Liu +1 more
TL;DR: In this article, a series of precise digital algorithms based on discrete Fourier transforms (DFT) to calculate the frequency and phasor in real-time are proposed, which are called the Smart Discrete Fourier Transform (SDFT).
Journal ArticleDOI
Measurement of harmonics/inter-harmonics of time-varying frequencies
TL;DR: In this paper, a nonlinear, adaptive mechanism is proposed for the extraction and measurement of individual harmonics of a signal with time-varying frequency, which offers higher degree of accuracy, structural/performance robustness, and frequency-adaptivity.
Journal ArticleDOI
A Precise Calculation of Power System Frequency
Jun-Zhe Yang,Chih-Wen Liu +1 more
TL;DR: In this paper, a real-time digital algorithm based on discrete Fourier transform (DFT) was proposed to estimate the frequency of a sinusoid with harmonics in real time.
References
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Book
Adaptive Signal Processing
Bernard Widrow,Samuel D. Stearns +1 more
TL;DR: This chapter discusses Adaptive Arrays and Adaptive Beamforming, as well as other Adaptive Algorithms and Structures, and discusses the Z-Transform in Adaptive Signal Processing.
Book ChapterDOI
Stationary and nonstationary learning characteristics of the LMS adaptive filter
TL;DR: It is shown that for stationary inputs the LMS adaptive algorithm, based on the method of steepest descent, approaches the theoretical limit of efficiency in terms of misadjustment and speed of adaptation when the eigenvalues of the input correlation matrix are equal or close in value.
Journal ArticleDOI
A New Measurement Technique for Tracking Voltage Phasors, Local System Frequency, and Rate of Change of Frequency
TL;DR: In this paper, the frequency and rate-of-change of frequency at the bus can also be determined from the positive sequence voltage phase angle, and the theoretical basis of these computations and results of experiments performed in the AEP power system simulation laboratory are also outlined.
Journal ArticleDOI
Adaptation and tracking in system identification—a survey
Lenhart Ljung,Svante Gunnarsson +1 more
TL;DR: This article gives a survey of basic techniques to derive and analyse algorithms for tracking time-varying systems, with special attention to the study of how different assumptions about the true system's variations affect the algorithm.
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