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Implementing a discrete PI Controller

Implementing a discrete PI Controller

Implementing a discrete PI Controller

(OP)
Hi,I'm relatively new to Matlab and am trying to implement a discrete PI controller to a simulation of an ammonia plant. The problem is that I don't know how to do it using Matlab code, as i'm used to simulink, and was wondering if anyone could help. Below is the code i've started with:

%PI Controller
   dt           = 10;        % Time Sample [secs]
   kp           = 10;        % Proporsional Gain
   ki           = 4;         % Integral Gain
   eIntegral    = (y);
   % New Setpoint after 1000 seconds
   if i == 1000
       yset = u1;
   end
   % Setpoint error
   if mod(i,dt) == 0
       e         = yset - y(30);
       eIntegral = eIntegral + e*dt
       P(u)      = kp*e + ki*eIntegral;
   end

I want it to implement after a stepchange at 1000 secs. This doesn't work, does anyone know why??

Thanks,
Bryan

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