Facing the error "PID tuner could not find an initial stabilizing controller for this plant"

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ANNEPOGU SUMANTH PAUL
编辑： Jemima Pulipati 2020-7-10
When trying to auto tune a PID controller, it says "The plant cannot be linearized" & "PID tuner could not find an initial stabilizing controller for this plant". The plant is a solar PV module with a little bit of additional circuitry to it. The purpose of the controller is to change the duty cycle of a switch in the circuit dynamically so that the PV module always operates at maximum power point. What should be done in such situations to design a controller? Thank you in advance

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Jemima Pulipati
Jemima Pulipati 2020-7-10
编辑：Jemima Pulipati 2020-7-10
Hello,
The workarounds for the issue are:
  1. You can use a PI controller instead of PID controller
  2. Check the 'Use filtered derivative' box in the PID controller block. This is a good practice in general to filter out high frequency noise.

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