Kyo-Beum Lee and Frede Blaabjerg, “Improved Direct Torque Control for Sensorless Matrix Converter Drives with Constant Switching Frequency and Torque Ripple Reduction,” IJCAS (International Journal of Control, Automation, and Systems), vol. 4, no. 1, pp. > Paper

In this paper, an improved direct torque control (DTC) method for sensorless matrix converter drives is proposed which enables to

minimize torque ripple, to obtain unity input power factor, and to achieve good sensorless speed-control performance in the low

speed operation, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the

advantages of matrix converters with the advantages of the DTC strategy using space vector modulation and a flux deadbeat

controller. To overcome the phase current distortion by the non-linearity of a matrix converter drive, the simple non-linearity

compensation method using PQR power theory are presented in the proposed scheme. Experimental results are shown to illustrate

the feasibility of the proposed strategy.