Influence of A/D quantization in an interpolated DFT based system of power control with a small delay

• Autorzy: Borkowski J. , Kania D. , Mroczka J.

Identyfikatory

DOI

10.2478/mms-2014-0036

• Języki publikacji: EN

Abstrakty

EN

Fast and accurate grid signal frequency estimation is a very important issue in the control of renewable energy systems. Important factors that influence the estimation accuracy include the A/D converter parameters in the inverter control system. This paper presents the influence of the number of A/D converter bits b, the phase shift of the grid signal relative to the time window, the width of the time window relative to the grid signal period (expressed as a cycle in range (CiR) parameter) and the number of N samples obtained in this window with the A/D converter on the developed estimation method results. An increase in the number b by 8 decreases the estimation error by approximately 256 times. The largest estimation error occurs when the signal module maximum is in the time window center (for small values of CiR) or when the signal value is zero in the time window center (for large values of CiR). In practical applications, the dominant component of the frequency estimation error is the error caused by the quantization noise, and its range is from approximately 8×10^-10 to 6×10^-4.

Słowa kluczowe

EN

photovoltaic system; frequency estimation; signal processing; A/D converter; control of power system

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2014
• Tom: Vol. 21, nr 3
• Strony: 423--432
• Opis fizyczny: Bibliogr. 25 poz., rys., tab., wykr., wzory

Twórcy

autor

Borkowski J.

• Chair of Electronic and Photonic Metrology, Wroclaw University of Technology, B. Prusa 53/55, 50-317 Wroclaw, Poland ([phone])

autor

Kania D.

• Chair of Electronic and Photonic Metrology, Wroclaw University of Technology, B. Prusa 53/55, 50-317 Wroclaw, Poland ([phone])

autor

Mroczka J.

• Chair of Electronic and Photonic Metrology, Wroclaw University of Technology, B. Prusa 53/55, 50-317 Wroclaw, Poland ([phone])

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