USING DSP METHODS FOR ACCURATE DYNAMIC MEASUREMENTS IN POWER SYSTEMS

L. Asnin, V. Backmutsky, M. Sedlachek

Abstract

This paper presents the results of comparison of a new method of magnitude spectrum estimation of periodical signals in Power Systems, which uses Discrete Fourier Transform (DFT) and special FIR filters, with other methods of spectrum analysis, based on a preliminary estimation of the dynamically changed signal frequency. The main purpose of the suggested method is to reduce the leakage errors under conditions of desynchronization between the signal and the sample frequencies. Digital modeling of this method shows that accuracy of the estimation of magnitudes of the signal harmonics increases essentially by reference to other methods based on the interpolation of samples. This method can be used especially in Power System dynamics investigation (relay protection, UPS tuning, etc).

Keywords

Power Systems, spectrum, measurement

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PWC-2003-TC4-004.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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