Abstract |
In this paper a new control method that allows the application of matrix converters in Direct Torque
Control (DTC) of induction machines is presented. Thanks to the matrix converter topology, this
control method allows, under the constraint of unity input power factor, the generation of the voltage
vectors required to implement the direct torque control of induction machines. Despite of the major
complexity of the matrix converter structure compared to traditional Voltage Source Inverters (VSI),
the proposed control algorithm is simple and robust. The appropriate switching configuration of the
matrix converter is selected using a switching table defined on the basis of three hysteresis controllers
applied to stator flux, electromagnetic torque and input power factor. Numerical and experimental
results are carried out and analysed, showing the feasibility of the proposed drive system. Finally, a
modified control strategy for the input power factor that reduces the harmonic content of the input
line current is proposed and verified by numerical simulations. |