Summary
This paper deals with an adaptive direct torque control (DTC) of two induction motors fed by a Z‐source five‐leg inverter. Indeed, one power common leg is shared between two phases of the two induction motors to reduce the power switches number. Furthermore, an impedance network (inductances and capacitors) is inserted between the DC source and the five‐legs power inverter to boost the input voltage and therefore eliminate a DC‐DC converter floor. In hence, during each sampling time, shoot‐through states are applied alternatively with the DTC techniques to ensure at the same time boost voltage regulation and an independent control of both induction motors. In this context, validation results have been presented to prove the effectiveness of the developed system.
This study presents an adapted direct torque control (DTC) of an induction motor fed by a Quasi Z-source power inverter. Indeed, the Quasi Z-source structure is introduced in the power inverter in order to boost the DC-Link voltage. For this, the boost control is mainly based on the shoot-through states of the power inverter which two power switches can be turned on at the same time. In this context, a switching table for DTC is developed to ensure an independent control of the flux and the torque of the induction motor and to boost the DC-Link voltage. Thus, the sampling time should be shared alternatively between the boost of the DC-Link voltage and the control of the electromagnetic torque. Consequently, the developed system reduces both the boost floor and the number of the used power switches. Moreover, it ensures a high-performance induction motor control. The validation results have been carried out to prove the effectiveness of the developed control.
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