Closed loop discrete PI controller

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Pranav Pillai
Pranav Pillai 2022-8-25
评论： Joel Van Sickel 2022-9-9
how to find integral and proportional constants.how can i interface it with a PWM and switch input to get desired op.
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Pranav Pillai
Pranav Pillai 2022-9-3
A closed loop system.Im designing a boost converter.PI controller is for the voltage correction.
Sam Chak
Sam Chak 2022-9-3
Could you provide the transfer function of the boost converter? It helps to determine the suitable values for the PI gains.

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Joel Van Sickel
Joel Van Sickel 2022-9-6
Hello,
please use the references on this page to dive deeper into designing closed loop control for boost converters.
https://www.mathworks.com/solutions/power-electronics-control/boost-converter-simulation.html
Regards,
Joel

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Pranav Pillai
Pranav Pillai 2022-9-9
I have figured out the PI gains using ziegler-nicholas method.
How can i find my boost converters transfer function?
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Joel Van Sickel
Joel Van Sickel 2022-9-9
Hello Pranav, if you use average mode converter models, you can do it fairly simply using the controls toolboxed and the model linearizer app.
https://www.mathworks.com/help/slcontrol/ug/linearize-simulink-model.html
If you want to keep switching involved, you'll need to do a frequency reponse
Here is the basics for frequency response estimation.
https://www.mathworks.com/company/newsletters/articles/estimating-the-frequency-response-of-a-power-electronics-model.html
One other alternative is since it's a boost converter, you can derive the 2nd order transfer function of the system, and close the loop with your PI controller using matlab commands or do it analytically. Wikipedia has the equivalent closed loop system for controller and plant defined as transfer functions available publicly, but getting the 2nd order transfer function for a boost converter is mostly in conference and journal papers.

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