Simulation of the predictive direct torque control for a PM synchronous machine

This paper presents a predictive direct torque control (PDTC) for a surface permanent magnet synchronous machine (PMSM). The control algorithm uses linear predictions of the controlled variables to preselect four possible active voltage space vectors (AVSVs) to build the torque demand one step in advance. Then, the trajectory of the torque and flux are predicted and evaluated to minimize the defined cost function, the AVSV that minimize the error is selected and applied in the next control cycle. With this control scheme is possible to obtain a fast dynamic performance similar to the conventional direct torque control, with the advantages of a constant switching frequency and a larger sample time. The control scheme is simulated using Matlab/Simulink to verify the performance under steady and dynamic operation.