function ydot=f1k(t,y)
Un=400;
Uk=10;
Ukm=Uk/100*Un/sqrt(3)*sqrt(2);
Omega=2*pi*50;
Rk=1.6;
Ls=0.045553;
ydot=(Ukm*sin(Omega*t)-y*Rk)/Ls;
end
