Performance Analysis Of Direct Torque Control Of Induction Machines
This thesis presents the analysis of the effects of hysteresis controllers on performance of direct torque control (DTC) of induction machines. The motivation of this research is that to provide the consideration for the designer in choosing appropriate bandwidth to have high performance of DTC dri...
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| Format: | Thesis |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/17045/1/Performance%20Analysis%20Of%20Direct%20Torque%20Control%20Of%20Induction%20Machines%2024%20Pages.pdf |
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| Summary: | This thesis presents the analysis of the effects of hysteresis controllers on performance of direct torque control (DTC) of induction machines. The motivation of this
research is that to provide the consideration for the designer in choosing appropriate bandwidth to have high performance of DTC drives. It should be noted that the DTC drive has gained widely acceptance for many industrial applications due to its simplicity. However, the DTC which is based on hysteresis comparators has two major drawbacks,
namely variable switching frequency and larger torque ripple. It can be shown that the DTC performance may deteriorate if the inappropriate flux or/and torque band width are chosen. This research is aimed to analyze DTC performances in terms of total harmonic distortion (THO), torque ripple and switching frequency for variations of torque and flux hysteresis bandwidths. At first, the modeling of induction machine and study of principle
of DTC were carried out, before they were being simulated using MA TLAB-Simulink. The problems which are mainly associated in hysteresis controllers were identified by
simulating the DTC of induction machine at different applications of hysteresis bandwidth, sampling frequency and operating condition (e.g. different of load torque and speed levels). By analyzing the DTC performances through simulations, it can provide useful information for the designer to identify the root of problem and hence chooses the appropriate hysteresis bandwidths at different operating conditions to achieve high DTC performance. |
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