PI controller implementation problems


I need to use PI controller together with the manually tuned input. PI is implemented by the TI concerto DSP. But my tuning speed influences the integrator. If I increase the input fast, then it may result in the overshot, and the voltage goes over the limit. If I tune the input slow, then the integrator may integrate too much, and cannot actually control. Does anyone have a good solution of this? Or anyone has ever encountered this problem (PI controller with manually tuned input)?

by minnieyue
March 06, 2017

1 Answer

Answer by mrobbins

Two thoughts:

  1. Do you have reasonable limits on your integrator? If you do, then the system will be able to recover reasonably quickly once the input imbalance is corrected.
  2. Could you manually reset the integrator when appropriate? If you only adjust the manual setpoint occasionally, that could be a good time to reset the integrator to some central value. This could be a button the user could press, or could be detected by your DSP when the user stops turning the knob.
+1 vote
by mrobbins
March 06, 2017

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