Development Of Direct Torque Control (DTC) Of Five-Phase Induction Machine

Goh, Wee Yen (2012) Development Of Direct Torque Control (DTC) Of Five-Phase Induction Machine. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This thesis presents the development of direct torque control (DTC) algorithm for five-phase induction machine. In DTC, a de-coupled control of electromagnetic torque and stator flux was established so that a fast instantaneous torque and flux control can be achieved. Based on the look-up table, the suitable voltage vectors are selected according to the information of the flux sector and error status (output of hysteresis comparators) in order to control both of stator flux and torque. In comparison to three-phase DTC, five-phase DTC provides a higher number of switching states (i.e 32 voltage vectors) which can offer more options in selecting the most optimal voltage vectors to further improve the overall DTC performances. This thesis is served to develop mathematical modeling and simulation of DTC of five-phase induction machine. It consists of a look-up table for 32 voltage vectors selection, modeling of five-phase induction machine, transformation of five-to-two phase as well as flux and torque estimators. The feasibility of the modeling which is based on MATLAB SIMULINK was verified through simulation results.

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