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Matlab Simulation in Control systems

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inverse model more zeros than poles

Hi all,

I want to simulate a PID or PD regulator in matlab. I can simulate a P and PI regulator in it.. but when I try to setup a transfer function (tf) of a PD or PID regulator I can't do a stepresponse of it...

I see all the examples explain the step response in combination with a proces but I want to do only the PD or PID regulator

Anyone knows a solution? I think it is because the differential action in the regulator...
 

regulator matlab

>> num=[2 1]

num =

2 1

>> den=[1]

den =

1

>> model1=tf(num,den)

Transfer function:
2 s + 1

>> step(model1)
??? Error using ==> ltipack.ltidata.utCheckComputability
Not supported for models with more zeros than poles.


This is the same problem... But how can I let people see what a PD regulator does with a step response?
 

matlab pi regulator

The step response of PD is ideal performance.
It can not simulated.
 

    M

    mobile-it

    Points: 2
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