function ydot = f2(t,y)
Un1=400;
Ukp=10;
Um=Ukp/100*Un1/sqrt(3)*sqrt(2);
omega=314.16;
Rk =  8;
Ls =  0.25337;
Lh =  266.94;
pom1=Ls/2+Lh;
pom2=Ls/2+Lh-Lh^2/pom1;
ydot=zeros(2,1);
ydot(1)=(Um*sin(omega*t)-y(1)*Rk/2-Lh*y(2)*Rk/2/pom1)/pom2;
ydot(2)=(Lh*Um*sin(omega*t)/pom1-Lh*y(1)*Rk/2/pom1-y(2)*Rk/2)/pom2;
end