NDLI: Accurate phasor and frequency estimation during power system oscillations using least squares

Content Provider	IET Digital Library
Author	Rao, Ayyalasomayajula Venkata Koteswara Soni, Krishan Mohan Sinha, Sanjay Kumar Nasiruddin, Ibraheem
Abstract	Accurate estimation of a phasor, frequency, and rate of change of frequency during changing power system condition is important to initiate precise control action for reliable power system operation. Conventional phasor estimation techniques cannot estimate the phasor accurately during dynamic conditions of power system. Furthermore, the phasor-based frequency estimation algorithms are being affected under such conditions. In this study, both angle and amplitude modulation parameters are considered in the signal model to improve the accuracy of the phasor estimation. The method uses Taylor's series expansion to linearise the signal model and computes the signal parameters using least squares. The method first computes the phasor using estimated parameters of the signals, subsequently calculates the frequency and rate of change of frequency. The performance of the proposed method is evaluated for standard test signals. Real signals recorded in numerical relay are used to assess the performance of the proposed method. The results are compared with the available method and found that the method can supplement the existing methods used in phasor measurement units and intelligent electronic devices.
Starting Page	989
Ending Page	994
Page Count	6
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 7, Sep (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5391
Journal	IET Science, Measurement & Technology
Publisher Date	2019-05-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Accurate Estimation Accurate Phasor Amplitude Modulation Amplitude Modulation Parameter Angle Conventional Phasor Estimation Technique Discrete Fourier Transform Dynamic Condition Estimated Parameter Frequency Estimation Least Squares Approximation Phase And Gain Measurement Phase Measurement Phasor Measurement Phasor Measurement Unit Phasor-based Frequency Estimation Algorithm Power System Condition Power System Measurement Power System Measurement And Metering Power System Oscillations Power System Parameter Estimation Precise Control Action Reliable Power System Operation Signal Model Signal Parameter Standard Test Signal Statistics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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