Enhanced DTC induction motor drives for THD minimization performance improvement with multilevel inverter

Siong Kai Chien, Sy Yi Sim, Wahyu Mulyo Utomo, Sie Long Kek, Farahiyah Mustafa, Nor Aira Zambri, Alvin John Lim Meng Siang, Gia Yi Sim


Direct Torque Control (DTC) is a method applied in Induction Motor (IM) drives to control the speed and torque of IM accurately and independently without feedback signal of pulse encoder from the motor shaft. However, in Fast Fourier Transform (FFT) analysis, the Total Harmonic Distortion (THD) of the IM drives is high in Direct Torque Control method with conventional inverter (CI). Therefore, the purpose of this study is to minimize the THD of the three-phase line current in order to improve the DTC IM drive’s performance without affecting the drive’s performance in terms of speed and torque. A DTC IM drive with Multilevel Inverter (MLI) is proposed in this study to reduce THD in three-phase line current and preserve good speed and torque response of IM simultaneously. DTC IM drive with proposed MLI based THD minimization has several advantages over the DTC IM drive with CI, including higher generated output voltage with low distortion with multiple switches, able to operate under low switching frequency, and the system able to work with renewable energy. In order to prove the effectiveness of the proposed MLI based THD minimization in DTC IM drive, MATLAB Simulink is used to investigate the response of the IM drive and THD under different operating condition. From this study, proposed MLI based THD minimization DTC IM drive is able to reduce THD in three-phase line current compared to DTC IM drive with CI with a maximum of 13% in THD reduction for low speed opertion.


direct torque control; multilevel inverter; total harmonic distortion;

DOI: http://doi.org/10.11591/ijpeds.v13.i1.pp%25p


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