How to give my PI controller initial value?

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Adeel Ashraf 2021-1-5

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评论： Jon 2023-9-6

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As my system initialize at 1800 RPM. I want to give inital value to my PI controller to remove the swing curve as you can see in my scope result. So that I can reduce the simulation time.

But I don't know how to do it.

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Jon 2021-1-5

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If you want the inital output of your PI controller to be 1800 when the error signal is zero then set the initial value of the integrator to 1800/I where I is the integrator gain

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Hedi BASBAS 2023-9-6

Hi Jon,

Could you explain with equations how you choose the inital condition as 1800/K_i ?

Best regards;

Jon 2023-9-6

For basic PI control the controller output, u is given by u = K_p*e + K_i*E, where e = (y_setpoint - y) and E is the state representing the integrated error. Assume you start your controller with y=y_sestpoint so the error e is zero. Then in order for u = 1800, we have 1800 = K_p*0 + K_i*E. Solving this for E, the initial state of the integrated error, gives E = 1800/K_i

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