Fault Tolerance in Direct Torque Control with Virtual Voltage Vectors

Abstract

Reliability is considered a fundamental requirement of some variable-speed electric drives. Therefore, multiphase systems, which introduce a higher fault tolerance than conventional three-phase ones, turn out to be an interesting alternative for these applications. This high fault-tolerant capability is obtained thanks to the higher number of freedom degrees. This paper presents a direct torque control strategy based on virtual voltage vectors when an open phase fault appears in a six-phase induction machine. These virtual voltage vectors reduce the copper losses due to x-y current components. Experimental tests have been provided to validate the control strategy.

Keywords

• Convertidores y accionamientos eléctricos
• Motores eléctricos
• Ingeniería del control
• Tolerancia al fallo