Control Engineering-II Lab 7 MATLAB GUI For Compensator Design URL http://imtiaz.kalwar.googlepages.com/subjects

By: Engr. Imtiaz Hussain Kalwar

Contents

ƒ GUI

for compensator Design

ƒ Lead

compensation

ƒ Lag

compensation

ƒ PID

compensation

ƒ PID

Design GUI

ƒ GUI

for tuning the PID controller

GUI For Compensation

GUI for Compensator Design ƒ

Installation Instructions

ƒ Download the software. http://imtiaz.kalwar.googlepages.com/designofcontrolsystems

ƒ Create a directory for the software. ƒ Extract the files into the newly created directory.

ƒ Add the directory to the path in MATLAB. ƒ From within MATLAB, type ‘main menu' to start the GUI.

Main Menu Type ‘mainmenu’ in command window

System Analysis Menu 1.Time domain analysis of 2nd order system 2.Frequency domain analysis of 2nd order system 3.Time domain analysis of SISO system 4.Frequency domain analysis of SISO system 5.Time & Frequency domain analysis of SISO system

System Design Menu 1.Design of Regulator System 2.Linear Quadratic Regulator 3.Lead Compensator 4.Lag Compensator 5.PID Control

Design Task (Lag-Compensation) ƒ ƒ

Settling time of the Plant is 4 sec. It is desired to decease the settling time to at most 1 sec.

4 G(S ) = S ( S + 2)

Design Task (PID)

ƒ Design

the PID controller for the following

plant such that

ƒ ess = 5 ƒ Mp = 25% ƒ ts = 3 sec

1 G(S ) = S ( S + 1)( S + 5)

PID Design GUI

PI/PID Design GUI for MATLAB ƒ

For a PI controller a first order transfer function that best represents the imported model is determined.

ƒ

For a PID controller a second order transfer function that best approximates the imported model is computed.

ƒ

Tuning method that is implemented in this tool is based upon a modification of Skogestad’s internal model control (IMC) tuning procedure

PI/PID Design GUI for MATLAB ƒ

Installation Instructions

ƒ Download the software. http://imtiaz.kalwar.googlepages.com/designofcontrolsystems

ƒ Create a directory for the software. ƒ Extract the files into the newly created directory.

ƒ Add the directory to the path in MATLAB. ƒ From within MATLAB, type 'PID_Design' to start the GUI.

PI/PID Design GUI for MATLAB ƒ After

typing 'PID_Design' in

MATLAB command window this window will appear.

ƒ

Four options in the window

ƒ

Import model

ƒ

Design Controller

ƒ

Analyze controller

ƒ

Quit

Import model Window ƒ

This window enables the user to input a model for the system that is to be controlled.

ƒ

The model can be entered in transfer function form or data representing a unit step response of the system.

Controller Design window ƒ

This window enables the user to input a model for the system that is to be controlled.

ƒ

The model can be entered in transfer function form or data representing a unit step response of the system.

Analyze Controller window ƒ

If additional information about the closed-loop system is required then this can be obtained in the ‘Analyze Controller’ window. .

ƒ

This window includes computation of the gain and phase margins, as well as drawing Bode and Nyquist plots .

Design Task Determine the PID parameters for the plant transfer function given below using PI/PID Design GUI

G(S ) =

1 S ( S + 1)( S + 5)

num=1; den=[1

6

5

0];

Submission

Submit the Hard copy of the results before 1st Feb 2007.