A new ride-through approach for matrix converter fed adjustable speed drives

In this paper, a new ride-through approach for matrix converterfed adjustable speed drives (ASDs) is discussed and the topology of conventional matrix converter is modified with the addition of three IGBTs and a dc-link capacitor. The proposed modification provides ride-through capability for matrix converter fed ASDs under a short term power interruption. During a power interruption, the matrix converter operates as a conventional PWM voltage source inverter with DC link and forces an immediate transition into the regenerating operation. The proposed scheme maintains rotor flux and keeps synchronization of matrix converter and motor during power outages. In the proposed ride-through approach, it is shown that the matrix converter is able to re-accelerate the motor to the reference speed without current transients. Simulation results are shown to demonstrate the advantages of the proposed scheme and preliminary experimental results are included.