Re: Control System Design methods using Octave.

[shall689]

Doug Stewart-4 wrote
> On Wed, Dec 6, 2017 at 6:30 PM, shall689 <

> sahallacy@

> > wrote:
> 
>> I updated my code to use the 1/SampleFrequency in the tf() function.  It
>> seems to give me much better results.
>>
>> The code in my last post had n am m values for invfreqz() that were not
>> related to my previous post.  I had been playing around with those values
>> to
>> see if I could get a bode plot that was closer to the bode plot generated
>> from the PSIM simulation frequency sweep.   The code below uses the n and
>> m
>> values I had in my original code.  How do I decide the n and m value ---
>> by
>> trial and error?
>>
>> I don't see how you are using n and m in this code?
> Doug
> 
> 
> 
> 
>>
>>
>>
> 
> 
>>
>> pkg load control;
>> pkg load signal;
>> clear all
>> x = csvread('buckVfreqResp.csv');
>> SampleFrequency = 20000;
>> T = 1/SampleFrequency;
>> f = x(:,1);
>> r = x(:,2);
>> phase_rad = x(:,3).*(pi/180);
>> h = r.*cos(phase_rad) + r.*(sin(phase_rad)*i);
>> w = f.*(2*pi*T);
>> [b,a] = invfreqz(h,w,2,3)
>> sys = tf(b,a)
>> bode(sys)
>>
>>
>>
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>> f1599825.html
>>
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Hello Doug,

n and m represent n and m in the function [b,a] = invfreqz(h,w,n,m).

Thanks,
Stephen



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