Hi, I am new to matlab and i want to generate a voltage sag signal using m-file using the following equation

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x(t)=A(1a(u(tt1)u(tt2)));
where
0.1 a ≤ 0.9(depth of voltage sag)
T ≤ t2 − t1 ≤ 8T(T is the period)
t1 <t2(moment of the sag starting and ending)
u(t)=1 for all t0(unit stp function)
I just tried the following command but i didn't get it. It showed error
t=0:0.0001:2;
f=2;
A=1.0;
W=2*pi*f;
x=A*sin(W.*t);
u=inline('t>=0');
a=0.6; t1=12; t2=24;
x1= (1-a(u(t-t1)-u(t-t2))).*x;
subplot(3,1,1)
plot(t,x1)
title('Voltage sag');
xlabel('time--->');
ylabel('Amplitude--->');
so pls. help me.
Thank you in advance

Answers (1)

MA
MA on 13 Nov 2014
t=0:0.0001:2;
f=2;
A=1.0;
W=2*pi*f;
x=A*sin(W.*t);
u=inline('t>=0');
a=0.6; t1=12; t2=24;
x1= (1-a*(u(t-t1)-u(t-t2))).*x;
plot(t,x1)
title('Voltage sag');
xlabel('time--->');
ylabel('Amplitude--->');
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