Journal ArticleDOI
Frequency tracking in power networks in the presence of harmonics
TLDR
In this paper, a modified zero-crossing method using curve fitting of voltage samples is proposed, and polynomial fitting of the discrete Fourier transform (DFT) quasi-stationary phasor data for calculation of the rate of change of the positive sequence phase angle.Abstract:
Three new techniques for frequency measurement are proposed. The first is a modified zero-crossing method using curve fitting of voltage samples. The second method is based on polynomial fitting of the discrete Fourier transform (DFT) quasi-stationary phasor data for calculation of the rate of change of the positive sequence phase angle. The third method operates on a complex signal obtained by the standard technique of quadrature demodulation. All three methods are characterized by immunity to reasonable amounts of noise and harmonics in power systems. The performance of the proposed techniques is illustrated for several scenarios by computer simulation. >read more
Citations
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Journal ArticleDOI
Real-time frequency and harmonic evaluation using artificial neural networks
TL;DR: In this article, a Hopfield type feedback neural network is proposed for real-time monitoring and analysis of harmonic variations in the power system, where the supply-frequency variation is handled separately from the amplitude/phase variations, thus ensuring high computational speed and high convergence rate.
Journal ArticleDOI
Real-time determination of power system frequency
Tadeusz Lobos,Jacek Rezmer +1 more
TL;DR: In this paper, the authors presented a new method of measurement of power system frequency, based on digital filtering and Prony's estimation method, which is more accurate than others, e.g., the measurement of angular velocity of the rotating voltage phasor.
Journal ArticleDOI
Power converter line synchronization using a discrete Fourier transform (DFT) based on a variable sample rate
TL;DR: In this paper, a method of filtering the incoming grid voltage using a recursive discrete Fourier transform (DFT) is presented, which provides a high degree of noise immunity but does produce a phase shift between the incoming voltage and the filtered output voltage when the DFT time window does not match the grid period.
Journal ArticleDOI
Synchrophasor Measurement Technology in Power Systems: Panorama and State-of-the-Art
TL;DR: This bibliography will aid academic researchers and practicing engineers in adopting appropriate topics and will stimulate utilities toward development and implementation of software packages.
Journal ArticleDOI
Active Synchronizing Control of a Microgrid
TL;DR: In this paper, the authors proposed an active synchronizing control scheme that adopts the network-based coordinated control of multiple DGs to provide the microgrid with a deterministic and reliable reconnection to the grid.
References
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Book
Theory and application of digital signal processing
TL;DR: Feyman and Wing as discussed by the authors introduced the simplicity of the invariant imbedding method to tackle various problems of interest to engineers, physicists, applied mathematicians, and numerical analysts.
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
A Least Error Squares Technique For Determining Power System Frequency
M.S. Sachdev,M. M. Giray +1 more
TL;DR: An algorithm for measuring frequency at a power system bus is presented and the effects of key parameters, that affect the performance of the algorithm, are discussed.
Journal ArticleDOI
Adaptive estimation of power system frequency deviation and its rate of change for calculating sudden power system overloads
Adly A. Girgis,W.L. Peterson +1 more
TL;DR: In this article, a two-stage algorithm is proposed to estimate power system frequency deviation and its average rate of change during emergency operating conditions that may require load shedding, where an adaptive extended Kalman filter is used to calculate the frequency deviation, magnitude, and phase angle of the voltage phasor.
Journal ArticleDOI
Off-nominal frequency measurements in electric power systems
M. M. Giray,M.S. Sachdev +1 more
TL;DR: In this paper, a method for extending the measurement range of the Least Error Squares (LES) technique is presented, which is suitable for implementing in most frequency relays.