Re: Control System Design methods using Octave.

[shall689]

Hello,

The frequency response data given in buckVfreqResp.csv (see attached file)
is the result of a frequency sweep in PSIM.  The attached m file, converts
that data to a descrete system and plots its bode plot (See Bode Plot of
Descrete System Image).

The two bode plots somewhat match each other on the left side of the bode
plot; however, the frequency range on the discrete system bode plot doesn't
match the frequency range on frequency sweep bode plot.  the buck converter
sample rate is 20kHz.  The max frequency on the discrete system bode plot is
2e-4 rad/seconds, which is equivalent to 0.64Hz.  

Why am I getting such small frequencies on the discrete system bode plot? 

Stephen

<http://octave.1599824.n4.nabble.com/file/t372348/FrequencyResponseFromPSIMSimulation.png>
 
<http://octave.1599824.n4.nabble.com/file/t372348/BodePlot.png> 
buckVfreqResp.csv
<http://octave.1599824.n4.nabble.com/file/t372348/buckVfreqResp.csv>  
CreateTFfromFreqResponse.m
<http://octave.1599824.n4.nabble.com/file/t372348/CreateTFfromFreqResponse.m>  



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