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Direct Torque Control of Induction Motor Fed by Reduced Switch Three Phase Inverter

Kazemlou, Shaghayegh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40230 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Zolghadri, Mohammad Reza
  7. Abstract:
  8. Reduction of power converters’ cost is one of the most important efforts to improve machines control systems. In this way, some new topologies for power electronic converters have been proposed. Among various topologies, four switch three phase inverter (FSTPI) thanks to the simple circuit, low cost, minimized conduction and switching losses and high reliability has attracted much attention recently. In this thesis, direct torque control (DTC) method is utilized to control of four switch inverter fed induction motor. In this way, in order to decrease flux and torque ripple and achieving constant switching frequency, a new Discrete Space Vector Modulation (DSVM) method have been proposed in which 12 symmetrical voltage vectors are generated by Space Vector Modulation (SVM) strategy. These vectors are used in a proposed switching table that uses five-level hysteresis comparators. Then Space Vector Modulation DTC (SVM-DTC) method in which two PI controllers are utilized to control of machine torque and flux separately, has been presented for first time to control of FSTPI fed induction motor. Also the effect of imbalance voltages of capacitors in DC-Link has been assessed and compensated for both proposed methods. Simulation results validate the good performance of proposed methods
  9. Keywords:
  10. Direct Torque Control ; Induction Motors ; Space Vector Modulation ; Four Switch Three Phase Inverter

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