Predictive Torque Control with Fixed Switching Frequency for Induction Motor Drives

Predictive torque control is one of the most considered high-performance methods for variable-speed applications. This scheme is characterised by a flexible architecture that provides a fast torque/flux response, while its operation reports variable switching frequency as one of the main issues. This work presents a redesigned technique to overcome the described drawback. The strategy applies two active voltage space vectors with an appropriate sequence at every sampling period to produce a constant number of commutations. The dwell times are computed with the conventional cost function and a novel optimisation process to obtain the proper switching combination. Simulation tests at transient- and steady-state demonstrate the quick dynamic response of this proposal, whereas a performance comparison respect to the conventional implementation illustrates the achieved enhancements and mitigation trade-off.