Matlab Script that I can add a Gaussian Noise to a Discrete Wavelet Transform processed fault signal

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Please does any one has a matlab script where I can add a Gausssian Noise to a Discrete Wavelete Transform processed fault signal. This will mimic a lightning disturbance and switching disturbance during fault connditions and normal steady state. Forf the protective relay to distinguish between this lightning disturbance and fault conditions

Accepted Answer

William Rose
William Rose on 18 Sep 2022
Edited: William Rose on 18 Sep 2022
If you have a fault signal x(t), processed by a DWT (or not), add Gaussian noise as shown.
s=1; %standard deviation of the added noise
xn=x+s*randn(size(x)); %x=signal without added noise
The fact that the signal has been processed by a DWT is not really relevant, unless there is more information that you want to share. Good luck with your work on lightning and faults.
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More Answers (1)

John Amoo-Otoo
John Amoo-Otoo on 21 Sep 2022
William, for a script like this where will the Gaussian Noise fit. I have also attached the data that needs to be processed
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John Amoo-Otoo
John Amoo-Otoo on 24 Sep 2022
Edited: John Amoo-Otoo on 24 Sep 2022
The output is to distinguish between a fault condition and Non faut condition. The entropy output(Highest and Minmimum entropy) wil tell me a fault condition and when a Protection starts and will use it as a treshold for the protection settings

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