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An Adaptive Differentiation Filter for Tracking Instantaneous Frequency in Power Systems

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1 Author(s)
Zivanovic, R. ; Adelaide Univ., SA

This paper presents an application of adaptive differentiation filter in tracking instantaneous frequency in electrical power systems. For each new sample, the filter automatically selects an optimal window length that maximizes measurement accuracy. Large window length is selected if the frequency is slow varying or steady state, to increase efficiency in filtering noise and harmonics. For fast-varying frequency, the window length is automatically reduced in order to make frequency tracking more accurate, sacrificing filtering efficiency. Automatic selection of the optimal window length that balances between tracking and filtering performance is the unique feature of this technique. This paper concludes with the presentation of the representative results obtained in the simulation study as well as in some practical applications. The results show the adaptive differentiation filter gives accurate frequency measurement under both steady-state and dynamic conditions

Published in:

Power Delivery, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

April 2007

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