SPEED CONTROL OF THREE PHASE INDUCTION MOTOR BY USING MULTIPHASE DC CONVERTER AND FOUR SWITCH INVERTER
Publication Date : 10/04/2016
The four-switch three-phase (B4) inverter, having a lower number of switches, was ﬁrst presented for the possibility of reducing the inverter cost, and it became very attractive as it can be utilized in fault-tolerant control to solve the open/short-circuit fault of the six-switch three-phase (B6) inverter. However, the balance among the phase currents collapses due to the ﬂuctuation of the two dc-link capacitor voltages; therefore, its application is limited. This paper proposes a predictive torque control (PTC) scheme for the B4 inverter-fed Induction Motor (IM) with the dc-link voltage offset suppression. The voltage vectors of the B4 inverter under the ﬂuctuation of the two dc-link capacitor voltages are derived for precise prediction and control of the torque and stator ﬂux. The three-phase currents are forced to stay balance by directly controlling the stator ﬂux. The voltage offset of the two dc-link capacitors is modeled and controlled in the predictive point of view. In this proposed system the genetic algorithm is used for speed loop. Keywords: Multiphase DC converter,Four-switch three-phase inverter, Arduino microcontroller.
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