Adaptive Frequency Estimation of Distorted Power System Signals Using Modified Extended Kalman Filter

Year 2011, Volume: 24 Issue: 1, 85 - 89, 14.01.2011

Cengiz Uzunoğlu , Serap Çekli , Mukden Uğur

Abstract

This research presents a method for frequency estimation of distorted power system signals using a modified Extended Kalman Filter (EKF). Distorted signals which have been obtained from measurements may involve noises which may affect the accuracy of frequency measurement in a power system. Thus, the proposed method is employed to eliminate and filter noise and hence to improve the efficiency of frequency estimation. Computer simulations have been carried out for the performance analysis of the proposed method and the comparison of the results of the proposed method with the former Extended Kalman Filter results are presented. The effectiveness of the new approach in power system frequency estimation was emphasized.

Keywords

Modified Extended Kalman filter, Frequency estimation, Power system

References

• Sreenivas T.V. and Niederjohn R.J., "Zero-crossing Based Spectral Analysis and SVD Spectral Analysis for Formant Frequency Estimation in Noise", IEEE Trans. Sig. Proc., 40: 2 (1992).
• Phadke A. G., Throp J. S. and Adamiak M., “A new measurement technique for tracking voltage phasors, local system frequency and rate of change of frequency,” IEEE Trans. Power Apparat. Syst.,. 102:1025-1038 (1983).
• Huang C.,H., Lee C.,H., Shih K.,J. and Wang Y.,J., “Frequency Estimation of Distorted Power System Signals Using Robust Extended Complex Kalman Filter” Intelligent Systems Applications to Power Systems, 10.1109/ISAP.2007.4441663, 1–6 (2007).
• Uzunoglu C. P., Ugur M., ‘Frequency Control with Zero Crossing Algorithm by Using Adaptive Filter in Power Systems ’, EVK, (2009).
• Haykin S., “Adaptive Filter Theory”, 4th Ed., New Jersey, Prentice Hall, ISBN: 0130901261, (2001).
• Driessen P. F., “DPLL bit synchronizer with rapid acquisition using adaptive Kalman filtering techniques”, IEEE Trans. on Communications, 42 (9):2673-2675 (1994).
• Routray A., Kumar A. and Rao K. P., “A novel kalman filter for frequency estimation of distorted signals in power systems”, IEEE Trans. on Instrumentation and Measurement, 51(3):469-479 (2002).
• Bentley E.C., Putrus G.A., Minns P.; McDonald S., “Effects of frequency deviation on the accuracy of harmonic analysis and mitigation” ,Universities Power Engineering Conference, 43rd International, 1–4 (2008).
• Kose N., Salor O., Leblebicioglu K., “Interharmonics analysis of power signals with fundamental frequency deviation using Kalman filtering “, Electric Power Systems Research, Elsevier 1145–1153 (2010).
• IEC 61000-4-7: “Testing and Measurement Techniques—General Guide on Harmonics and Interharmonics Measurements and Instrumentation, for Power Supply Systems and Equipment Connected Thereto”, (2005).