Improved DTC using optimal switching strategy for dual-open end winding induction motor

Lee, Kah Wai (2019) Improved DTC using optimal switching strategy for dual-open end winding induction motor. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Direct Torque Control (DTC) of induction machine has received wide acceptance in many adjustable speed drive applications due to its simplicity and high-performance torque control. However, the DTC using conventional design poses two major problems such as high switching frequency and larger torque ripple. These problems are due to inappropriate voltage vectors which are selected among a limited number of voltage vectors available. The proposed research aims to formulate an optimal switching strategy for dual-open end winding induction motor. By using dual inverters,it provides greater number of voltage vectors which can offer more options to select the most appropriate voltage vectors. By selecting the suitable voltage vectors, it allowed the motor to produce minimum torque slope but enough to reach the required demand. To achieve this result, the proposed method does not require speed information, PI controller, frame transformation, space vector modulator, reference voltage estimator and machine parameters. The improvements obtained are minimizing the switching frequency with reducing the losses and torque ripple reduction.

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