Power grid impedance tracking with uncertainty estimation using two stage weighted least squares

• Autorzy: Borkowski D. , Barczentewicz S.

Identyfikatory

DOI

10.2478/mms-2014-0010

• Języki publikacji: EN

Abstrakty

EN

The paper presents a new method for simultaneous tracking of varying grid impedance and its uncertainty bounds. Impedance tracking consists of two stages. In the first stage, the actual noise estimate is obtained from least squares (LS) residua. In the second stage, the noise covariance matrix is approximated with the use of residual information. Then weighted least squares (WLS) method is applied in order to estimate impedance and background voltage. Finally uncertainty bounds for impedance estimation are computed. The robustness of the method has been verified using simulated signals. The proposed method has been compared to sliding LS. The results have shown, that the method performs much better than the LS for all considered cases, even in the presence of significant background voltage variations.

Słowa kluczowe

EN

power system; utility impedance tracking; uncertainty estimation

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2014
• Tom: Vol. 21, nr 1
• Strony: 99--110
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr., wzory

Twórcy

autor

Borkowski D.

• AGH University of Science and Technology, Department of Measurement and Electronics, al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Barczentewicz S.

• AGH University of Science and Technology, Department of Measurement and Electronics, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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Uwagi

EN

This research was founded by Polish National Science Centre under decision DEC-2012/05/B/ST7/01218.s