Author : Pala Prasad Reddy M 1
Date of Publication :7th August 2016
Abstract: The four-switch three-phase (B4) inverter has the possibility of reducing the inverter cost, and it became very attractive in fault-tolerant control to solve the open/short-circuit faults of the six-switch three-phase (B6) inverter. Its application is limited due to the fluctuation of the two dc-link capacitor voltages which causes the unbalance among the phase currents. Predictive torque control (PTC) scheme is proposed for the B4 inverter-fed induction motor (IM) with the dc-link voltage offset suppression. For precise prediction and control of the torque and stator flux, the voltage vectors of the B4 inverter under the fluctuation of the two dc-link capacitor voltages are derived. By directly controlling the stator flux, the three-phase currents are forced to stay balance. The voltage offset of the two dc-link capacitors is modeled and controlled in the predictive point of view.
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