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I want this code to run only once. Battery Charge/Discharge

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Hi guys, newbie here on Simulink, this is my first project.
I'm trying to make a battery charge and discharge simulation, I'm using a project i saw in a youtube amateur tutorial, but the example itself is flawed and I'm trying to do my changes. I have this code here:
What it does is when the SOC is > 80% the system is feeding the Load, when it reaches below 40% it turns of the Load and starts charging the batteries.
function [LoadOn, ChargingOn] = fcn(SOC)
LoadOn = 1;
ChargingOn=0;
if (SOC>80)
LoadOn=1;
ChargingOn=0;
end
if (SOC<40)
LoadOn=0;
ChargingOn=1;
end
The problem that I'm having is that on the iteration that it reaches >40% it correctly changes the variables to Load=0 and Charge=1, but on the next iteration, due to the second and third line of code, it changes back to LoadOn=1 and Charge=0, when I wanted it only to happen at SOC>80%.
And If I remove the 2nd and 3rd line it gives me an error. Basically what I want to do is that the 2nd and 3rd line only run once.
Any suggestions?

Respuesta aceptada

Ben Cunningham
Ben Cunningham el 15 de Abr. de 2019
Editada: Ben Cunningham el 16 de Abr. de 2019
One way of doing this would be using Persistent variables - but just as with global variables you will need to be careful - to get back to your starting condition you should use 'clear fcn'.
Additionally the persistent variable should not be the output of the function.
e.g.
function [LoadOn, ChargingOn] = fcn(SOC)
persistent LoadOnPersistent;
persistent ChargingOnPersistent;
if isempty(LoadOnPersistent) % Initial condition
LoadOnPersistent = 1;
ChargingOnPersistent = 0;
end
if (SOC>80)
LoadOnPersistent=1;
ChargingOnPersistent=0;
end
if (SOC<40)
LoadOnPersistent=0;
ChargingOnPersistent=1;
end
LoadOn = LoadOnPersistent;
ChargingOn = ChargingOnPersistent;
end
  6 comentarios
SALAH alatai
SALAH alatai el 21 de Jul. de 2022
Can you please share the simulation work for understanding purpose how and where to use this functio?
Khalid Massoud
Khalid Massoud el 10 de Nov. de 2022
Editada: Khalid Massoud el 10 de Nov. de 2022
It gives me an error in the line no.10

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