# DIRECT TORQUE CONTROL SCHEME FOR LESS HARMONIC CURRENTS AND TORQUE RIPPLES FOR DUAL STAR INDUCTION MOTOR

## DOI:

https://doi.org/10.59277/RRST-EE.2023.4.2## Keywords:

Direct torque control (DTC), 3 and 5-level torque regulators, Harmonic currents, Torque ripples, Steady-state error torque, Dual star induction motor (DSIM)## Abstract

Multi-phase machine drives are widely used in high-power applications such as naval propulsion and railway traction. In the control context, direct torque control (DTC), based on the large voltage vectors, is the most used control for a dual-star induction motor. However, these techniques suffer from steady-state errors and torque ripples. Therefore, the stator phase currents have a non-sinusoidal waveform, which leads to high losses and reduces the drive efficiency of the system caused by considerable harmonic currents. This paper presents a modified direct torque control (MDTC) based on two steps to select the appropriate vector to supply the dual star induction motor (DSIM) and effectively reduce the harmonic currents. Moreover, this paper deals with a comparative study of 3-level, 5-level, and modified 5-level torque regulators to reduce the steady-state error and torque ripple. In addition, a PI controller is incorporated for the modified five-level torque regulator to reduce the torque error at low, medium, and high speeds. Moreover, an investigation of switching and core losses has been done for the DSIM drive. Finally, validation results have been presented to prove the effectiveness of developed direct torque control of the dual star induction motor (DSIM) under different operating conditions.

## References

(1) K. Marouani, K. Nounou, M. Benbouzid, B. Tabbache, Investigation of energy-efficiency improvement in an electrical drive system based on multi-winding machines, Electrical Engineering, 100, pp. 205–216 (2016).

(2) E. Levi, R. Bojoi, F. Profumo, H.A. Toliyat, S. Williamson, Multiphase induction motor drives–a technology status review, IET Electric Power Applications, 1, 4, pp. 489–516 (2007).

(3) Y. Zhao, T.A. Lipo, Space vector PWM control of dual three-phase induction machine using vector space decomposition, IEEE Transactions on Industry Applications, 31, 5, pp. 1100–1109 (1995).

(4) E. Levi, Multiphase electric machines for variable-speed applications, IEEE Transactions on Industrial Electronics, 55, 5, pp. 1893–1909 (2008).

(5) R. Bojoi, M. Lazzari, F. Profumo, A. Tenconi, Digital field-oriented control for dual three-phase induction motor drives, IEEE Transactions on Industry Applications, 39, 3, pp. 752–760 (2003).

(6) K. Iffouzar, M.F. Benkhoris, H. Aouzellag, K. Ghedamsi, D. Aouzellag, Direct rotor field-oriented control of polyphase induction machine based on fuzzy logic controller, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 62, 1, pp. 42–47 (2017).

(7) K. Iffouzar, M.F. Benkhoris, K. Ghedamsi, D. Aouzellag, Behavior analysis of a dual stars induction motor supplied by pwm multilevel inverters, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 61, 2, pp. 137–141 (2016).

(8) L. Youb, A. Crăciunescu, Direct torque control and vectorial control of the induction motor, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 53, 1, pp. 87–98 (2008).

(9) R.M. Ariff, D. Hanafi, W.M. Utomo, N.M. Zin, S.Y. Sim, A.A. Bohari, Takagi-Sugeno fuzzy purpose as speed controller in indirect field-oriented control of induction motor drive, International Journal of Power Electronics and Drive Systems, 8, 2, pp. 513–521 (2017).

(10) S. Sit, H.R. Ozcalik, E. Kilic, An efficient speed control method based on neuro-fuzzy modeling for asynchronous motors, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 63, 3, pp. 326–331 (2018).

(11) I. Takahashi, T. Noguchi, A new quick-response and high-efficiency control strategy of an induction motor, IEEE Transactions on Industry Applications, IA-22, 5, pp. 820–827 (1986).

(12) A. Idir, M. Kidouche, Rt-lab and dspace: two softwares for real time control of induction motors, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 59, 2, pp. 205–214 (2014).

(13) A. Azib, D. Ziane, T. Rekioua, A. Tounzi, Robustness of the direct torque control of double star induction motor in fault condition, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 61, 2, pp. 147–152 (2016).

(14) K. Hatua, V.T. Ranganathan, Direct torque control schemes for split-phase induction machine, IEEE Transactions on Industry Applications, 41, 5, pp. 1243–1254 (2005).

(15) R. Bojoi, F. Farina, G. Profumo, A. Tenconi, Direct torque control for dual three-phase induction motor drives, IEEE Transactions on Industry Applications, 41, 6, pp. 433–448 (2016).

(16) H. Lallouani, B. Saad, Performances of type 2 fuzzy logic control based on direct torque control for double star induction machine, Rev. Roum. Sci. Techn. – Électrotechn. Et Énerg., 65, 1-2, pp. 103–108 (2020).

(17) K. Gopakumar, V.T. Ranganthan, S.R. Bhat, Split-phase induction motor operation from PWM voltage source inverter, IEEE Transactions on Industry Applications, 29, 5, pp. 927–932 (1993).

(18) M.A. Abbas, R. Christen, T.M. Jahns, Six-phase voltage source inverter driven induction motor, IEEE Transactions on Industrial Application, IA-20, 5, pp. 1251–1259 (1984).

(19) D. Hadiouche, L. Baghli, A. Rezzoug, Space-vector PWM techniques for dual three-phase AC machine: analysis, performance evaluation, and DSP implementation, IEEE Transactions on Industry Applications, 42, 4, pp. 1112–1122 (2006).

(20) E. Levi, Advances in converter control and innovative exploitation of additional degrees of freedom for multiphase machines, IEEE Transactions on Industrial Electronics, 63, 1, pp. 433–448 (2016).

(21) M. Duran, F. Barrero, Recent advances in the design, modeling, and control of multiphase machines part II, IEEE Transactions on Industrial Electronics, 63, 1, pp. 459–468 (2016).

(22) L.B. Zheng, J.E. Fletcher, B.W. Williams, X.N. He, A novel direct torque control scheme for a sensorless five-phase induction motor drive, IEEE Transactions on Industrial Electronics, 58, 2, pp. 503–513 (2011).

(23) G. Abad, M. Á. Rodríguez, J. Poza, Two-level VSC based predictive direct torque control of the doubly fed induction machine with reduced torque and flux ripples at low constant switching frequency, IEEE Transactions on Power Electronics, 23, 3, pp. 1050–1061 (2008).

(24) Y. Zhang, J. Zhu, A novel duty cycle control strategy to reduce both torque and flux ripples for DTC of permanent magnet synchronous motor drives with switching frequency reduction, IEEE Transactions on Power Electronics, 26, 10, pp. 3055–3055 (2011).

(25) Y. Zhang, J. Zhu, Direct torque control of permanent magnet synchronous motor with reduced torque ripple and commutation frequency, IEEE Transactions on Power Electronics, 26, 1, pp. 235–248 (2010).

(26) Y. Tatte, Torque ripple minimization with modified comparator in DTC based three‐level five‐phase inverter fed five‐phase induction motor, IET Power Electronics, 14, 9, pp. 1713–1723 (2021).

(27) Y.N. Tatte, M.V. Aware, J.K. Pandit, R. Nemade, Performance improvement of three-level five-phase inverter-fed DTC-controlled five-phase induction motor during low-speed operation, IEEE Transactions on Industry Applications, 54, 3, pp. 2349–2357 (2018).

(28) A. Wang, H. Zhang, J. Jiang, D. Jin, S. Zhu, Predictive direct torque control of permanent magnet synchronous motors using deadbeat torque and flux control, Journal of Power Electronics, 23, 2, pp. 264–273 (2023).

(29) F. Yang, H. Chen, V. Pires, J. Martins, Y. Gorbounov, X. Li, M. Orabi, Improved direct torque control strategy for reducing torque ripple in switched reluctance motors, Journal of Power Electronics, 22, 4, pp. 603–613 (2022).

(30) S.S. Hakami, K.B. Lee, Four-level hysteresis-based DTC for torque capability improvement of IPMSM fed by three-level NPC inverter, Electronics, 9, 10, pp. 1558 (2020).

(31) H. Masoumkhani, A. Taheri, PI regulator-based duty cycle control to reduce torque and flux ripples in DTC of six-phase induction motor, IEEE Transactions on Power Electronics, 9, 1, pp. 354–370 (2018).

(32) Y.N. Tatte, M.V. Aware, Direct torque control of five-phase induction motor with common-mode voltage and current harmonics reduction, IEEE Transactions on Power Electronics, 32, 11, pp. 8644–8654 (2016).

(33) Y. Ren, Z.Q. Zhu, Reduction of both harmonic current and torque ripple for dual three-phase permanent-magnet synchronous machine using modified switching-table-based direct torque control, IEEE Transactions on Industrial Electronics, 62, 11, pp. 6671–6683 (2015).

(34) Y. Gao, L. Parsa, Modified direct torque control of five-phase permanent magnet synchronous motor drives, IEEE Applied Power Electronics Twenty Second Annual Conference, pp. 1428–1433 (2007).

(35) K.D. Hoang, Y. Ren, Z.Q. Zhu, M. Foster, Modified switching‐table strategy for reduction of current harmonics in direct torque controlled dual‐three‐phase permanent magnet synchronous machine drives, IET Electric Power Applications, 9, 1, pp. 10–19 (2015).

(36) K.D. Hoang, Z.Q. Zhu, M. Foster, Optimum look-up table for reduction of current harmonics in direct torque controlled dual three-phase permanent magnet brushless ac machine drives, Sixth IET International Conference on Power Electronics, Machines and Drives, pp. 1–6 (2012).

(37) J. Xu, M. Odavic, Z.Q. Zhu, Z.Y. Wu, N. Freire, Switching-table-based direct torque control of dual three-phase PMSMs with closed-loop current harmonics compensation, IEEE Transactions on Power Electronics, 36, 9, pp. 10645–10659 (2021).

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*REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE*,

*68*(4), 331-338. https://doi.org/10.59277/RRST-EE.2023.4.2