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Positive and negative sequence estimation for unbalanced voltage dips

Rafael Flores (Institutionen för signaler och system, Signalbehandling) ; Irene Y.H. Gu (Institutionen för signaler och system, Signalbehandling) ; Math Bollen (Institutionen för elkraftteknik, Elkraftsystem)
in Proc. IEEE Power Engineering Society Summer Meeting, '03, Canada, JUL 13-17 p. 2498-2502. (2003)
[Konferensbidrag, refereegranskat]

This paper proposes the use of a complex Kalman filter for the estimation of positive and negative sequences from three phase voltages. A complex voltage is obtained by applying the alphabeta-transform followed by the dq-transform using a rotational operator. The algorithm for three phase voltages containing K harmonics is also given. In the conventional method, estimation of positive and negative sequences is performed through two steps: the magnitude and phase-angle in each individual phase of the voltages are first estimated and the symmetrical component transformation is then applied. The proposed method offers a direct estimation of the positive and negative sequences that may reduce the estimation errors. In addition, the proposed method has a reduced computational cost since the number of state variables is reduced to 2/3 as compared to that in the conventional method. An experiment was performed on measured three phase voltage data. Results have shown that the proposed method offers a good estimation.

Denna post skapades 2006-08-25. Senast ändrad 2013-06-10.
CPL Pubid: 15111


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Institutioner (Chalmers)

Institutionen för signaler och system, Signalbehandling
Institutionen för elkraftteknik, Elkraftsystem (1900-2004)


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