Speed Anti-Windup PI strategies review for Field Oriented Control of Permanent Magnet Synchronous Machines

The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and voltage. To safeguard the system´s integrity, the PI output is normally limited eventually causing the windup phenomenon characterized by long periods of overshoots which may even result in instability.Firstly, this paper models and tunes the current and speed PI controllers with the root locus method for field oriented control of a permanent magnet synchronous machines. Secondly, it is shown the mentioned unwanted windup phenomenon in the speed loop. Finally, the anti-windup strategies are simulated and their behavior are compared when driving a permanent magnet synchronous machine with field oriented control. Finally, some experimental results obtained from a PMSM matrix converter-fed set up have been carried out. These results corroborate the mathematical study and simulations presented all over this paper.