Implementation of adaptive control schemes in PMSM

Abstract

Permanent magnet synchronous generators with high efficiency, high reliability and good control characteristics, have been widely used. Therefore, a good performance of control approach is necessary. As we know, the backstepping approach, a recursive Lyapunov-based scheme, has flexibility to avoid cancellations of useful nonlinearities and achieve regulation and tracking properties. Backstepping can perfectly fit for PMSM. Therefore, backstepping control theory was applied to design a velocity controller to control the velocity of PMSM. And then, a nonlinear adaptive velocity controller based on adaptive backstepping approach for PMSM with nonlinear coupling and parameter uncertainties was presented. The simulation results showed that the backstepping controller can reduce the overshoot and greatly shorten the time to stabilize. Moreover, results showed that adaptive backstepping controllers can not only ensure the stability of the system, but also effectively restrain the harmful effects on velocity control systems. Of course, proper mathematical equations including the mathematical model of PMSM, Clark and Park transformation, Lyapunov theorem, and backstepping theory were all necessary as the preparation for final modeling and simulation. Actually, we mentioned them all.