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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Pradabane, Srinivasan
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Control & Systems Engineering Electrical & Electronics Engineering

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Improvised direct torque control of a permanent magnet synchronous motor Lemma, Berhanu Deggefa; Pradabane, Srinivasan; Sutikno, Tole
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 15, No 1: March 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v15.i1.pp19-26

Abstract

Permanent magnet synchronous motor (PMSM) is widely used in different applications because of their different key operation features. But despite having important key features, PMSM suffers from torque ripple when simple control techniques like direct torque control (DTC) are employed. Several approaches have been raised by many researchers to lessen the ripple when DTC is used for controlling the PMSM drive. In this work, duty ratio-optimized DTC control, which has the same simplicity as conventional DTC (CDTC), and delay compensation for input signal prediction are proposed. In the proposed system, to determine the duty ratio, slope manipulation was made by considering the minimization of torque error and forcing the developed torque to be equal to the reference torque at the end of the span. An online slope determination approach was employed to compute the duty ratio. MATLAB 2021b is used for simulation purposes. The dynamics and steady-state performance of the proposed scheme were tested for both variable-load and variable-speed operations. In addition, the harmonic performance and ratio of harmonic power loss to total active power loss of the motor were evaluated. In general, the proposed scheme performs effectively in reducing steady-state ripple and harmonic.
DTC of PMSM based on a simple duty ratio approach with ripple reduction scheme Lemma, Berhanu Deggefa; Pradabane, Srinivasan; Sutikno, Tole; Reta, Getu Girma; Feyisa, Negasa Muleta
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i2.pp808-816

Abstract

Today, phase permanent magnet synchronous motor (PMSM) applies to electric drives. But due to its structure and control scheme, PMSM suffers from ripple performance when a control scheme like direct torque control (DTC) is used. This work uses a simple scheme to generate switching signals and determine duty ratios. The duty ratio is obtained from the Volt-second balance. Switching signal generation is performed in the DTC scheme by incorporating the effects of duty ratio, torque error, flux error, and sector number. Dwelling time is obtained in volt-seconds using the reference voltage magnitude and sector number. But voltage state selection is done using the DTC lookup table. Since the DTC lookup table is used for voltage state selection only one active and one null voltage is used. Both active and null voltage periods are divided into two parts and each voltage vector is applied twice in one total switching period. The proposed scheme is tested in MATLAB 2021b. Simulation results indicate that the method is effective in terms of dynamics and harmonics. The scheme torque ripple is 12.5%. Likewise, the flux ripple and harmonic are 0.69% and 0.79%, respectively. Additionally, the scheme is effective for both four quadrants and wide-speed operation. Verification of the proposed scheme is done with OPAL-RT (OP4500). The scheme appears to be effective.
Co-Authors Feyisa, Negasa Muleta Lemma, Berhanu Deggefa Reta, Getu Girma Tole Sutikno