I try to simulate a power electronic chopper like buck or boost or any of them to get the bode plot of model. but I can't do that.in the other word I can't use bode block in simulink.
please help me
Since the introduction of the Simulink Control Design Toolbox, you can use following approach to get the Bode plots of a Simulink model. You can find a more detailed explanation of this approach here.
Related
I was looking to simulate the discrete sir model in MATLAB and also to find stability and bifurcation graph. can anyone help me solve these problems?
A great source for Matlab scripts is the Mathworks file exchange. A search for the SIR model found:
https://www.mathworks.com/matlabcentral/fileexchange/75100-sir-epidemic-spread-model?s_tid=srchtitle
This should have what you're looking for (unfortunately don't have Matlab on this computer to check).
For the discrete sir equations a for loop as described in:
https://www.mathworks.com/matlabcentral/answers/325773-solving-difference-equation-with-its-initial-conditions
should be able to solve your system for fixed parameters. You're going have to do a bit of work to get the bifurcation diagram and stability. This answer:
Generate bifurcation diagram for 2D system
should get you going.
I build an equivalent circuit in Simulink and it works. Now I want to get the nquvist plot of this equivalent circuit. Does anyone have an idea how to achieve this. Till now I only get the Impedance versus the frequency. I attached the equivalent circuit:
Thanks a lot
When using blocks from "Simscape Power Systems Specialized Technology" use voltage/current measurement blocks (depending on the numerator/denumerator of the transfer function). The outputs of these blocks are Simulink signals. Once you have the signals, you can use the "Simulink Control Design" toolbox to display a Nyquist plot directly. See following link for an example (although for Bode plot, but it is straight forward to apply the procedure to Nyquist plots).
I'd like to use the Data Signal Processing toolbox in MATLAB, if I buy a MATLAB license and the toolbox, do I need to buy Simulink too?
What exactly does Simulink do? (In layman's terms.)
No you don't need to buy Simulink for that.
Layman terms... Simulink is kind of a graphical programming interface, where code is seen in terms of little boxes.
If I use the bode (tf(num,den)) function to plot the Bode diagram I get a curved version. Is it possible to get a straight line version (as if you would calculate by hand)? Also, would it be possible to show the component lines that make the Bode diagram?
Thanks in advance!
What you want is called Asymptotic Bode Diagram.
Matlab does not sketch the Bode plot, it evaluates the transfer function at various frequencies and draw modulus and phase on the two diagrams.
I found a script in matlab central, I didn't try it but maybe it is enough for you.
Greetings,
Nicola
How to generate the curve of transfer function:
G0(s)=exp(-s)*[(2s+4)/(s^3+5s^2+6s+4)]
using MATLAB and Simulink?
What kind of curve do you mean? Bode plot? Nyquist plot? Step response?
Use the tf function to create your transfer function with the InputDelay parameter to represent the exp(-s), see Models with Time Delays in the documentation for more details.
Once you have your transfer function, you can use functions like bode, nyquist, step, impulse, etc... to generate your "curve" of choice.
All of this requires the Control System Toolbox.