Direct Torque Control of an Interior Permanent Magnet Synchronous Machine fed by a Direct AC-AC Converter

This paper presents a novel direct torque control (DTC) scheme of an interior permanent magnet synchronous motor (IPMSM) fed by a matrix converter. In the proposed scheme, a sliding mode torque and stator flux controller is integrated with a simplified Venturini´s modulation algorithm to achieve low torque and flux ripples, sinusoidal input/output currents and unity fundamental displacement factor on the input side regardless of the load power factor while maintaining constant and controllable switching frequency and preserving the fast response and robustness. Numerical simulations are carried out for the classical and modified DTC schemes in both steady-state and transient conditions, verifying the effectiveness of this new proposed scheme which is superior to the classical one