A discussion of an improved method based on a modified DFT for spectrum estimation under Asynchronous Sampling Condition
| Autor: | Gabriel Malagon-Carvajal, Jeisson Bello-Pena, Cesar Duarte, Gabriel Ordóñez-Plata |
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| Rok vydání: | 2016 |
| Předmět: |
Discrete-time Fourier transform
Computer science 020208 electrical & electronic engineering Fast Fourier transform Spectral density estimation 02 engineering and technology Discrete Fourier transform Harmonic analysis symbols.namesake IEC 61850 Fourier analysis Distortion 0202 electrical engineering electronic engineering information engineering Electronic engineering symbols Algorithm |
| Zdroj: | 2016 Clemson University Power Systems Conference (PSC). |
| DOI: | 10.1109/psc.2016.7462825 |
| Popis: | This article discusses an improved method for harmonic estimation when Asynchronous Sampling Condition (ASC) is present. The method is based on previous work on a modified DFT (Discrete Fourier Transform) using a compensation of the number of samples. This paper presents the analytical derivation of a new mathematical expression using trapezoidal integration rule and compares the performance of both methods with the MATLAB® built-in fft function. Two study cases are discussed: The first considers the processing of 50 Hz signals from substation automation systems according to IEC 61850 at a fixed sampling rate of 80 samples/period. The second considers the processing of electrical distorted signals in a 60 Hz power grid according to IEC 61000-4-30 with sampling rate of 256 samples/period. The results for both methods exhibit good accuracy. However, the proposed method has a better performance; near to 30 dB for amplitude and phase estimation than previous work. |
| Databáze: | OpenAIRE |
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