Performance Improvement of Matrix Converter Direct Torque Control System

Abstract

In asynchronous motor direct torque control systems, the power supply using the matrix converter can achieve the effect of direct torque control and also has the advantages of the matrix converter. Nonetheless, direct torque control still has drawbacks in terms of pulsation. In this paper, the characteristics of direct torque control method and its existing problems are analyzed in depth. In view of the shortcomings of torque ripple, an improved scheme of torque tracking control is proposed based on conventional control methods. On the basis of theoretical simulation, DSP and FPGA algorithms are designed respectively in C language and VHDL to implement the proposed control strategy. Finally, a highly integrated experimental platform of matrix converter has been developed to verify the proposed control strategy. The simulation and experimental results verify the correctness and effectiveness of the improved scheme.

Induction Motor Direct Torque Control with Synchronous PWM

“…[18,19], other methods are introduced, using a threelevel voltage-source inverter. An improved scheme of torque tracking control is proposed in [20] with the aim of reducing the torque ripple. In the basic DTC scheme, the switching frequency of the inverter power semiconductors is determined by the width of the two hysteresis comparators bands and by the load and speed conditions.…”