Abstract:

In order to improve the performance of the AC adjustable speed system and reduce the pollution to power network,a compound control strategy that combines matrix converter(MC)with direct torque control (DTC)is proposed.In this strategy,an MC is first transformed into an equivalent topology resulting from the corn-bination of a rectifier and an inverter.then,the DTC and the current space vector modulation are respectively per-formed on the inverter and the rectifier sides.and the strategies on the two sides are finally synthesized and changed into the control signals of the nine bidirectional switches in MC.The MC controlled by this strategy not only achieves the DTC of asynchronous machine with excellent dynamic performance but also acquires good input currents and an adjustable power factor.Simulated results indicate that the proposed strategy is feasible and excellent.

Key words: matrix converter, direct torque control, space vector modulation