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

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

Answer 1

[Jemima Pulipati]

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.