Help with a script in MATLAB (user defined function block)

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Eng.Salwa1

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Hello everyone
I m trying to detect sag,swell and interruption using the user defined function block.
I am able to detect sag ,swell but the only problem i am facing is with the interruption.
As you can see from the figure, the first subplot is a filtered sine wave (Lowpass filter Fn=8) when there is an interruption my script doesnt understand it is an interruption so when filtered sinewave starts to gradually decrease , my sag detector interprets this decline as a sag. How can i modify it so it would only read interruption?
Ts=1e-6

Sag detector script
Code: 
function y = fcn(u)

if (u<=293) && (u>=260.5);  
    y=0.5;
elseif (u<260.5) && (u>=228);
    y=1;
    elseif (u<228) && (u>=195.5);
    y=1.5;
    elseif (u<195.5) && (u>=163);
    y=2;
    elseif (u<163) && (u>=130.5);
    y=2.5;
    elseif (u<130.5) && (u>=98);
    y=3;
    elseif (u<98) && (u>=33);
    y=3.5;
else
   y=0; 
end

Interruption detector
Code: 
function y = fcn(u)


if abs(u<=0.5);    
    y=1;
else
    y=0;
end

Thank you
https://obrazki.elektroda.pl/6504222800_1458145147.jpg
 
Last edited by a moderator:

Do you really mean abs(u<=0.5) or (abs(u)<=0.5); they are not really the same thing
 

c_mitra said:
Do you really mean abs(u<=0.5) or (abs(u)<=0.5); they are not really the same thing
Click to expand...

you are right (abs(u)<=0.5); but it doesn't make any difference, my sag code needs to be modified. The interruption code is working perfectly.
 

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