The research of digitized substation fault diagnosis based on 3D GIS

Ling, Zheng; Yang, Chao; Hu, Yanxiang

doi:10.1109/mec.2011.6025726

Cited by 2 publications

(1 citation statement)

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“…Based on the fact that this technology is relatively new, there is a need to develop new algorithms for diagnosing complex technical systems. The demand is confirmed by numerous researches and developments in this field [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A mathematical model for estimating and forecasting the state of a digital substation based on the wavelet transform method

et al. 2017

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Abstract. The article the possibility of applying the wavelet transform method in combination with a neural-fuzzy approach to solving problems of forecasting the state of digital substations is considered. The optimum level of the wavelet expansion of the time series corresponding to the change in the phase voltage for the day on the basis of the Hurst index is determined. The influence of the sample size and the type of the mother wavelet on the Hurst index is researched. It was revealed, that for wavelet decomposition, the use of the Daubechy wavelet as the mother wavelet is effective, which provides a smoother filtering of noise, compared to the Haar wavelet. Analysis of the original series does not allow to evaluate the optimal level of wavelet expansion if the noise level of the time series under consideration is low (less than 10%), since the Hurst index remains unchanged. However, using the logarithm of changing the time series allows for small fluctuations to be taken into account, which allows to determine the optimal level of the wavelet expansion for their smoothing.

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