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논문 기본 정보

자료유형
학술저널
저자정보
Yanhui Xi (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control) Zewen Li (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control) Xiangjun Zeng (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control) Xin Tang (Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control)
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.12 No.3
발행연도
2017.5
수록면
1,016 - 1,026 (11page)

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초록· 키워드

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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.

목차

Abstract
1. Introduction
2. The State Space Model of the Power Signal
3. The EKF-ML Method
4. Simulations
5. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2017-560-002385279