function ydot = f3(t,y)
Un1=25;
Ukp=11;
Ukm=Un1/sqrt(3)*sqrt(2)*Ukp/100;
omega=2*pi*50;
Rk =  0.0063;
Ls =  4.3722e-04;
Lh =  0.3999;
pom1=Ls/2+Lh;
pom2=Ls/2+Lh-Lh^2/pom1;
ydot=zeros(2,1);
ydot(1)=(Ukm*sin(omega*t)-y(1)*Rk/2-Lh*y(2)*Rk/2/pom1)/pom2;
ydot(2)=(Lh*Ukm*sin(omega*t)/pom1-Lh*y(1)*Rk/2/pom1-y(2)*Rk/2)/pom2;
end