Positive and negative sequence estimation for unbalanced voltage dips
Paper in proceedings, 2003

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.

Author

Rafael Flores

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Irene Yu-Hua Gu

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Mathias Bollen

Department of Electric Power Engineering, Electric power systems

in Proc. IEEE Power Engineering Society Summer Meeting, '03, Canada, JUL 13-17

2498-2502

Subject Categories

Computer and Information Science

DOI

10.1109/PES.2003.1271035

More information

Created

10/8/2017