Can any one help me to set an adaptive threshold using matlab code?

Actually, I need to discriminate fault from power swing, voltage instability and load encroachment with the help of threshold setting. All the conventional threshold settings are considered based on the measured impedance, decaying dc component in the input signal etc. But, I need an adaptive threshold setting which means the system automatically set the threshold based on the type of event.

Answer 1

[Sean de Wolski]

Perhaps look at ischange or islocalmax/findpeaks.

[kasimala venkatanagaraju]

Thank you so much for your kind suggestion sir. In each and every event having different peaks like fault during power swing having 10 peaks, fault during voltage instability is 5 peaks. How can we set the threshold? if all the events having the same number of peaks then it is ok but here it was different

[Sean de Wolski]

findpeaks has a bunch of name-value pairs you can set that force a peak to be a certain prominence, width, etc...

See the input list in the documentation:

doc findpeaks