Browsing by Author "Tesfaye, Meberate"

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    Design and Implementation of Direct Torque Control Drive of Three-Phase Induction Motor based on DSP
    (Addis Ababa University, 2019-06) Tesfaye, Meberate; Mengesha, Mamo (PhD)
    Direct torque control (DTC) technology is a superior, modern and a new type of AC machine drive control technology developed after vector control technology. In this Thesis, the Direct Torque Control (DTC) scheme for Induction Motor Drive using Space Vector Modulation (SVM) technique is studied. DTC provides excellent properties of regulation, even if without rotational speed feedback. The technology directly controls the instantaneous value of the electromagnetic torque and stator flux-linkage through the control of stator flux linkage and electromagnetic torque in the stationary coordinate system and has the advantages of rapid torque response, simple control structure, and easy digitalization. These quantities are estimated with only stator voltages, stator currents, and stator resistance. The induction motor has been modeled and simulated in the stationary d-q reference frame and its transient and steady-state characteristics are drawn. The MATLAB Simulink consists of an induction motor mathematical model, a two-level hysteresis comparator for stator flux control, a three-level hysteresis comparator for torque control, a switching table for voltage vector selection, stator flux position identifier, a three-phase voltage source inverter (VSI), flux and torque estimators. The hardware circuit is composed of in addition to the MATLAB Simulink component it has three-phase Induction machine, TMDSHVMTRPFCKIT with other necessary equipment. The switching table is employed for selecting the optimum inverter output voltage vectors so as to attain a fast torque response, low inverter switching frequency, and low harmonic losses in the code. The simulation of DTC schemes (Conventional DTC) has been carried out using MATLAB/SIMULINK and the results are discussed. From estimated speed of simulation result it has good transient and steady state performance with overshoot 1.531% and with approximated steady state error 0.0002. High Voltage Motor Control and PFC Development kit (TMDSHVMTRPFCKIT) with TMS320F28035 Control Card is programmed using code composer studio for hardware implementation of the DTC scheme and the results are discussed. steady state estimated stator flux module has fluxuation from the reference with an error of 2.8% maximum ripple.