My resonant frequency in simulation is different like resonant frequency calculated by Thompson formula, what is wrong?

Hello, I have a question, about paralell resonant circuit, I have to compare impedance characteristics of this circuit:

</matlabcentral/answers/uploaded_files/107966/chko%20paralelna.png> I calculated frequency characteristics by this equation in P1: fr=1/2*pi*sqrt((Lt+Lf)*Cf) I have parallel resonant on frequency 187 Hz (187/50=3,742), impedance on this frequency is 41,3 ohm, like we see in tab, but in simulation in simulink I have only 0,12 ohm, I dont know what is wrong

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[David Goodmanson]

Hi Tomas,

I of course don't know if that line is copied verbatim from your code, but if it is, it certainly isn't helping things that you have

 fr=1/2*pi*sqrt((Lt+Lf)*Cf)
 instead of
 fr=1/(2*pi*sqrt((Lt+Lf)*Cf))