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http://dx.doi.org/10.5370/JEET.2017.12.3.1016

Detection of Voltage Sag using An Adaptive Extended Kalman Filter Based on Maximum Likelihood  

Xi, Yanhui (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control (Changsha University of Science and Technology))
Li, Zewen (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control (Changsha University of Science and Technology))
Zeng, Xiangjun (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control (Changsha University of Science and Technology))
Tang, Xin (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control (Changsha University of Science and Technology))
Publication Information
Journal of Electrical Engineering and Technology / v.12, no.3, 2017 , pp. 1016-1026 More about this Journal
Abstract
An adaptive extended Kalman filter based on the maximum likelihood (EKF-ML) is proposed for detecting voltage sag in this paper. Considering that the choice of the process and measurement error covariance matrices affects seriously the performance of the extended Kalman filter (EKF), the EKF-ML method uses the maximum likelihood method to adaptively optimize the error covariance matrices and the initial conditions. This can ensure that the EKF has better accuracy and faster convergence for estimating the voltage amplitude (states). Moreover, without more complexity, the EKF-ML algorithm is almost as simple as the conventional EKF, but it has better anti-disturbance performance and more accuracy in detection of the voltage sag. More importantly, the EKF-ML algorithm is capable of accurately estimating the noise parameters and is robust against various noise levels. Simulation results show that the proposed method performs with a fast dynamic and tracking response, when voltage signals contain harmonics or a pulse and are jointly embedded in an unknown measurement noise.
Keywords
Voltage sag; Adaptive estimation; The extended Kalman filter; The maximum likelihood method; Wavelet transform;
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