전력계통에서 수렴성 향상을 위한 탐색기반 고분해능주파수 추정기법A search-based high resolution frequency estimation providing improved convergence characteristics in power system
- Authors
- 안기성; 서영덕; 장태규; 강상희
- Issue Date
- 2018
- Publisher
- 한국전기전자학회
- Keywords
- Frequency estimation; spectrum analysis; iterative method; transform; least mean square
- Citation
- 전기전자학회논문지, v.22, no.4, pp 999 - 1005
- Pages
- 7
- Journal Title
- 전기전자학회논문지
- Volume
- 22
- Number
- 4
- Start Page
- 999
- End Page
- 1005
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18881
- DOI
- 10.7471/ikeee.2018.22.4.999
- ISSN
- 1226-7244
2288-243X
- Abstract
- 본 논문에서는 전력계통에서 정밀하고 변화에 수렴성이 빠른 탐색을 기반으로 하는 주파수 추정 기법을 제안하였다. 제안된 주파수 추정 알고리즘은 고분해능 스펙트럼의 기울기를 추정하여 스펙트럼의 peak 점을 탐색하는 구조를 적용하였다. 과도적으로 주파수 변화가 큰 경우에 기존 방법들의 단점인 수렴속도가 늦는 점을 보완 또는 개선하기 위한 방법으로 Contextanalysis를 통하여 Full-search 기법과 주파수 추정변수들을 적응적으로 적용하여 주파수 추정의 정밀도와 수렴속도를 향상시키고 대표적인 주파수 추정기법인 DFT(discrete Fourier transform) 방법, ECKF(extended complex Kalman filter),MV(minimum variable)방법들과 비교하여 수렴성과 정밀도가 우수함을 보였다.
This paper proposed a search-based high resolution frequency estimation method in power systme. The proposed frequencyestimation method adopts a slope-based adaptive search as a base of adaptive estimation structure. The architectural and operationalparameters in this adaptive algorithm are changed using the information from context layer analysis of the signals including a localizedfull-search of spectral peak. The convergence rate of the proposed algorithm becomes much faster than those of other conventionalslope-based adaptive algorithms by effectively reducing search range with the application of the localized full-search of spectrum peak.
The improvements in accuracy and convergence rate of the proposed algorithm are confirmed through the performance comparison withother representative frequency estimation methods, such as, DFT(discrete Fourier transform) method, ECKF(extended complex Kalmanfilter), and MV(minimum variable) method.
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