- Title
- Precise algorithm for frequency estimation under dynamic and step-change conditions
- Creator
- He, Zhengyou; Fu, Ling; Han, Wenzhen; Mai, Ruikun; Dong, Zhao Yang
- Relation
- IET Science, Measurement and Technology Vol. 9, Issue 7, p. 842-851
- Publisher Link
- http://dx.doi.org/10.1049/iet-smt.2014.0107
- Publisher
- Institution of Engineering and Technology
- Resource Type
- journal article
- Date
- 2015
- Description
- To achieve fast-response frequency estimation under step-change dynamics as well as accurate frequency estimation under slowly varying dynamics, a dynamic-model-based frequency estimation with step-change detection (DFESD) algorithm is proposed in this study. In DFESD, the derivative of the initial phasor estimation, which is obtained from short-time Fourier transform and the first-order Taylor-expansion phasor model, is used to detect the step changes in signals. Then, the initial estimations are adaptively selected by the data-selection strategy to estimate the frequency, of which the estimation is based on a high-order Taylor-expansion model to express the dynamic characteristics in signal. DFESD is a Taylor-expansion-based algorithm and it avoids the states mixture of both pre- and post- step-change data within one long data window, so it can track the frequency accurately under slowly varying dynamics and give fast-response estimation under step-change dynamics. Performance of the proposed algorithm is evaluated by computer-simulated and electromagnetic transients including DC (EMTDC) generated signals, and the results prove the efficiency of DFESD for accurate or fast-response frequency estimation under various test cases.
- Subject
- frequency estimation; frequency measurement; Fourier transforms
- Identifier
- http://hdl.handle.net/1959.13/1314092
- Identifier
- uon:22702
- Identifier
- ISSN:1751-8822
- Language
- eng
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