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Published Article / ENY-ARTICLE-2008-009

Real-Time Determination of Power System Frequency

Lobos, T (Wroclaw University of Technology, Poland) ; Rezmer, J (Wroclaw University of Technology, Poland)

1997-05-30

Abstract: The main frequency is an important parameter of an electrical power system. The frequency can change over a small range due to generation-load mismatches. Some power system protection and control applications, e.g., frequency relay for load shedding, load-frequency controller, require accurate and fast estimation of the frequency. Most digital algorithms for measuring frequency have acceptable accuracy if voltage waveforms are not distorted. However, due to nonlinear devices, e.g., semiconductor rectifiers, electric arc furnaces, the voltage waveforms can include higher harmonics. The paper presents a new method of measurement of power system frequency, based on digital filtering and Prony’s estimation method. Simulation results confirm, that the proposed method is more accurate than others, e.g., than the method based on the measurement of angular velocity of the rotating voltage phasor.

Keyword(s): Discrete Fourier transforms ; FIR digital filters ; frequency measurement ; power system parameter estimation ; protective relaying
Note: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 46, NO. 4, AUGUST 1997, pp. 877-881


Fulltext : http://zet10.ipee.pwr.wroc.pl/record/10/files/

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Record created 2008-03-06, last modified 2008-03-09

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