How to obtain the parameters of a discrete PI controller in term of the tuned parameters of a continuous PI controller ?

Khalifa University

André Quintã The article is very useful and solves the question actually. Thank you for sharing

Reddivari Sarva Jagannadha Reddy

Abdelkader BOUAZIZ

SOUGUEUR Division - Chemistry (POLYMERS), Université Ibn Khaldoun Tiaret

Alan F Rawle

Retired

Anuraj Nayarisseri

EMINENT BIOSCIENCES

John Francis Miller

Enlighten Scientific LLC

Qamar Ul Islam

Universiti Sains Malaysia

Dear Ahmed Mohammedosman

Manual PID tuning is done by setting the reset time to its maximum value and the rate to zero and increasing the gain until the loop oscillates at a constant amplitude. (When the response to an error correction occurs quickly a larger gain can be used. If response is slow a relatively small gain is desirable).

Kind Regards

Qamar Ul Islam

André Quintã

University of Aveiro

I suggest you to see this example

Article GUI Based Control System Analysis using PID Controller for Education

Khalifa University

Qamar Ul Islam , Thanks for your response, I am familiar with this procedure to tune PI parameters in s-domain . what I was looking for is how to obtain these parameters in z-domain after I have already tuned them in the s-domain.

Khalifa University

Michael Short yes these are the relations that I was looking for. Thank you very much

Khalifa University

André Quintã The article is very useful and solves the question actually. Thank you for sharing

Why my Simulink model Vienna Rectifier not reducing the THD and output voltage to the level I want it to be?

I am trying to simulate the following case: A three-phase source in a Matlab is connected to a Vienna Rectifier which is supposed to supply power to a resistive load of 50KW. Output DC voltage to be 800V DC and the input voltage is 400V AC. Technically a Vienna rectifier after rectification also improves power factor, that is, reduces the input current distortion to be less than 5%. I have designed almost everything correctly still neither the Vienna rectifier is reducing the input current distortion nor it is boosting the output voltage at the DC link to be 800V. I cannot figure out what is wrong. I am trying to solve this problem for the past 2 weeks still no solution.

8 answers

Asked 3rd Jun, 2021

Arkadeep Deb

To run the simulation, first, run the Vienna_rectifier_data.m file and then simulate the test.slx

The Matlab version is 2020b. If you need me to convert to an older version I can do that too.

Any kind of help is highly appreciated.

Thank you

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I am afraid that solver cannot be suitable for such system of equations.

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10 answers

Asked 10th Jul, 2015

Mohamed Abdelaal

Hello,

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I designed a decentralized controller for multivariable process by allowing the loop interactions and simulink model has been developed. I also evaluated the performance (IAE,ISE,TV) of the system under sequential set point changes in loops. Now I want to analyse the robust stability by using inverse singular value plot. How to obtain the inverse singular value plot from simulink model?

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R Hanuma Naik

What is the step response of a system if it has zero at origin?