MATLAB: How to develop simulink model using this code

pid controller

i new in matlab.. my task to design a water level using PID controller and simulate using simulink.. this is my first try.. but i dont know how to use my coding with simulink..

clear all clc

syms s

%G=0.036/(36.942s^2+12.1568s+0.451)

num=0.036; den=sym2poly(36.942*s^2+12.1568*s+0.451);

G=tf(num,den);

H=1;

Kp=1; Ki=0; Kd=0;

C=pid(Kp,Ki,Kd);

T=feedback(C*G,H);

step(T)

Best Answer

Take a look at a few "getting started" videos for Simulink - you can find them here .

Also, check out videos and examples on PID Control with MATLAB and Simulink page.

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MATLAB: How to extract values of Kp, Ki, Kd and D of a PID transfer functio

s=tf('s');
PID=(29.24)+(15.51/s)-(840.334/(s+35))
syms Kp Kd Ki N
NPID_num=[Kp+N*Kd Kp*N+Ki N*Ki];
NPID_den=[1 N 0];
eqn1=PID.Numerator{1}(1)==NPID_num(1);
eqn2=PID.Numerator{1}(2)==NPID_num(2);
eqn3=PID.Numerator{1}(3)==NPID_num(3);
eqn4=PID.Denominator{1}(2)==NPID_den(2);
solx=vpasolve([eqn1 eqn2 eqn3 eqn4]);
Kp=subs(Kp,solx.Kp)
Kd=subs(Kd,solx.Kd)
Ki=subs(Ki,solx.Ki)
N=subs(N,solx.N)

What I did is a simple equation solving. I defined the unknown parameters as symbolic and then obtain the numerical values with the vpasolve function. Note that at the end, the symbolic controller parameters are replaced with their numerical values. After that, in the PID Controller block in Simulink, write Kp, Ki, Kd and N to the parameters repsectively. Hope this helps.

Best Answer

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