Frequency estimation by demodulation of two complex signals
(1997) IEEE Summer Meeting In IEEE Transactions on Power Delivery 12(1). p.157-163- Abstract
- This paper presents a method for frequency estimation in a power system by demodulation of two complex signals. In power system analysis, the αβ-transform is used to convert three phase quantities to a complex quantity where the real part is the in-phase component and the imaginary part is the quadrature component. This complex signal is demodulated with a known complex phasor rotating in opposite direction to the input. The advantage of this method is that the demodulation does not introduce a double frequency component. For signals with high signal to noise ratio, the filtering demand for the double frequency component can often limit the speed of the frequency estimator. Hence, the method can improve fast frequency estimation of signals... (More)
- This paper presents a method for frequency estimation in a power system by demodulation of two complex signals. In power system analysis, the αβ-transform is used to convert three phase quantities to a complex quantity where the real part is the in-phase component and the imaginary part is the quadrature component. This complex signal is demodulated with a known complex phasor rotating in opposite direction to the input. The advantage of this method is that the demodulation does not introduce a double frequency component. For signals with high signal to noise ratio, the filtering demand for the double frequency component can often limit the speed of the frequency estimator. Hence, the method can improve fast frequency estimation of signals with good noise properties. The method loses its benefits for noisy signals, where the filter design is governed by the demand to filter harmonics and white noise. The method has been previously published, but not explored to its potential. The paper presents four examples to illustrate the strengths and weaknesses of the method. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4589044
- author
- Akke, Magnus LU
- organization
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- demodulation filtering theory frequency estimation parameter estimation power systems signal processing
- in
- IEEE Transactions on Power Delivery
- volume
- 12
- issue
- 1
- pages
- 157 - 163
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- conference name
- IEEE Summer Meeting
- conference location
- Denver, Colorado, United States
- conference dates
- 0001-01-02
- external identifiers
-
- scopus:0030779305
- ISSN
- 1937-4208
- DOI
- 10.1109/61.568235
- language
- English
- LU publication?
- yes
- id
- 80c46c6c-970a-4bb0-8edf-56fa7396cce0 (old id 4589044)
- date added to LUP
- 2016-04-01 12:34:20
- date last changed
- 2022-02-19 00:22:07
@article{80c46c6c-970a-4bb0-8edf-56fa7396cce0,
abstract = {{This paper presents a method for frequency estimation in a power system by demodulation of two complex signals. In power system analysis, the αβ-transform is used to convert three phase quantities to a complex quantity where the real part is the in-phase component and the imaginary part is the quadrature component. This complex signal is demodulated with a known complex phasor rotating in opposite direction to the input. The advantage of this method is that the demodulation does not introduce a double frequency component. For signals with high signal to noise ratio, the filtering demand for the double frequency component can often limit the speed of the frequency estimator. Hence, the method can improve fast frequency estimation of signals with good noise properties. The method loses its benefits for noisy signals, where the filter design is governed by the demand to filter harmonics and white noise. The method has been previously published, but not explored to its potential. The paper presents four examples to illustrate the strengths and weaknesses of the method.}},
author = {{Akke, Magnus}},
issn = {{1937-4208}},
keywords = {{demodulation filtering theory frequency estimation parameter estimation power systems signal processing}},
language = {{eng}},
number = {{1}},
pages = {{157--163}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
series = {{IEEE Transactions on Power Delivery}},
title = {{Frequency estimation by demodulation of two complex signals}},
url = {{http://dx.doi.org/10.1109/61.568235}},
doi = {{10.1109/61.568235}},
volume = {{12}},
year = {{1997}},
}