Rotating sector switching table‐based direct torque control of matrix converter‐fed PMSM drives for common‐mode voltage minimisation

Abstract

A novel direct torque control (DTC) using rotating sector switching table is proposed for a matrix converter (MC) fed permanent magnet synchronous motor (PMSM) system in order to minimise common-mode voltage of the system, exploiting MC rotating vector's advantage of generating zero common-mode voltage. To overcome the difficulty that the angle between adjacent rotating vectors varies according to the phase of input voltage, the rotating vectors are classified into two groups, and each group of vectors have identical rotating direction and fixed angle between adjacent vectors. Rotating sectors of the vector plane are then established, and concise switching table is put forward for the MC-DTC. Experiments are carried out on a 1.6 kW prototype. The results demonstrate considerable common-mode voltage reduction and adequate dynamic performance of the proposed MC-DTC.