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From: hd1_x marc on 1 Jul 2010 15:15
Hi,
I am facing with a problem with sisotool matlab 2010a.
Presently I need to creat two compensateur C1 and C2 with the last model (6th) from the menu of control architecture.
The thing is I don't know what is the procedure to creat my both compensators C1 and C2.
My both tranferts functions are
G1= (1.88 s + 100)/(7.52e-006 s^2 + 0.0002 s + 1) loop current
and
G2=(-0.0004 s + 2)/(0.0188 s + 1) loop voltage

The time constant of my boost converter is 0.9 milisecond

Can anyone help me to find the best C1 and C2 compensators ?
Many thanks in advance.
My e-mail is sw1_n(a)hotmail.com
From: Arkadiy Turevskiy on 2 Jul 2010 17:45
You might want to take a look at this demo:
http://www.mathworks.com/products/simcontrol/demos.html?file=/products/demos/shipping/slcontrol/scdairframectrldespad.html

It shows how to design a cascaded system. Basically you need to open the outer loop (open the loop at output of C1), design inner loop controller C2. Then you design outer loop controller C2.

To open the outer loop :
- go to "Architecture" tab,
- select "Loop Configuration",
- in the drop down menu select - "Open Loop - Output of C2"
- Add a checkbox below "Open" and press Ok.

Now use whatever technique you like to tune C2 first and then C1 - bode, root locus, automatic PID tuner- whatever you want.

HTH.
Arkadiy


"hd1_x marc" <sw1_n(a)hotmail.com> wrote in message <i0ipg9$8c8$1(a)fred.mathworks.com>...
> Hi,
> I am facing with a problem with sisotool matlab 2010a.
> Presently I need to creat two compensateur C1 and C2 with the last model (6th) from the menu of control architecture.
> The thing is I don't know what is the procedure to creat my both compensators C1 and C2.
> My both tranferts functions are
> G1= (1.88 s + 100)/(7.52e-006 s^2 + 0.0002 s + 1) loop current
> and
> G2=(-0.0004 s + 2)/(0.0188 s + 1) loop voltage
>
> The time constant of my boost converter is 0.9 milisecond
>
> Can anyone help me to find the best C1 and C2 compensators ?
> Many thanks in advance.
> My e-mail is sw1_n(a)hotmail.com
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