NDLI: On-line recursive method of phasor and frequency estimation for power system monitoring and relaying

Content Provider	IET Digital Library
Author	Ashrafian, Abdolaziz Mirsalim, Mojtaba
Abstract	A real-time method of phasor and frequency estimation is proposed in this study. The method is based on the recently developed signal processing tool, S-transform. It is implemented recursively by taking advantage of recursive complex band pass infinite impulse response filters with a low computational burden, using only 10 samples of the previous output and nine samples of the input signal. The method is implemented in the Matlab software and its performance is appraised considering the decaying DC component, noise and severe harmonic and inter-harmonic distortions and dynamic conditions. Moreover, a wavelet based method, a discrete Fourier and a recursive discrete Fourier based method for phasor estimation have been implemented and the performances of the methods have been compared in various operating conditions. To assess methods performances for real signals, the recorded signals of a differential relay have been fed to all of the methods and their performances compared. In addition, a power system has been simulated in the EMTP software, and performances of the methods have been assessed using the recorded fault signals of the EMTP software. Both the real data and simulation results indicate that the proposed S-transform based method is superior to other methods considering dynamic and static conditions.
Starting Page	2002
Ending Page	2011
Page Count	10
ISSN	17518687
Volume Number	10
e-ISSN	17518695
Issue Number	Issue 8, May (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/10/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.0007
Journal	IET Generation, Transmission & Distribution
Publisher Date	2016-05-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter DC Component Decaying Discrete Fourier Transform Dynamic Condition EMTP Software Filtering Method in Signal Processing Frequency Estimation Harmonic Distortion IIR Filter Integral Transforms Interharmonic Distortion MATLAB Software Noise Distortion Online Recursive Method Phasor Estimation Phasor Measurement Power System Measurement And Metering Power System Monitoring Power System Relaying Recorded Fault Signal Recursive Complex Band Pass Infinite Impulse Response Filter Recursive Discrete Fourier Method Recursive Estimation S-transform Signal Processing Tool Static Condition Statistics Wavelet Transform Wavelet-based Method
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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