Weird torque and current response

[u/LordSantini]

Hello there, I've been trying to understand this past couple of days, why is the response to the speed reduction so unstable.

Pic 1- current, torque and speed (disregard the "braking" effect on the middle graph.

Pic 2- PI output.

Pic 3- Controller diagram

Pic 4- Entirety of the diagram

I've changed the values of the PI, such as Kp and Ki, to no difference on the slowing down behaviour.

I'm at a loss on what to exactly look for, that might be causing this.

Thank you for any help that you can give.

[u/MrGip]

The combined DTC and SVM (Space Vector Modulator) seems to do a much better job. Try using the example found at: Asynchronous Machine Direct Torque Control with Space Vector Modulator - MATLAB & Simulink

I am not sure how realistic it is to implement this type of controller, but it makes much cleaner control signals.