MATLAB: PMSM Drive system Linearization

Question

Hello Everybody

I am working on a MATLAB Simulink model for PMSM drive system, my system is controlling the motor's torque. I am facing a problem in linearizing the plant. I have tried to tune PID controller parameters, but the plant cannot be linearized. I don't understand the problem enough to fix it effectively, hereby I tried a lot of things randomly but never worked, in the attached file I tried some manual tuning method but it doesn't result in good dynamic response because a huge overshoot is observed in the output currents and torque 🙁

Can anyone help in this regard. The Simulink file is attached.

Thanks in advance

Ali Bashabsheh

Answer 1

Hi there,

Linearization does not work for models with discontinuities such as PWM and power semiconductors.

There are a couple of techniques we recommend:

1. Do ac sweep (frequency response estimation) and use that frequency response for tuning - see this example .

2. Use PID Autotuner block to tune PID Controller for you- see this example .

Hope this helps.

Arkadiy