A New Switching Algorithm for Compensating the Voltage Deviation of NPC Inverter DC Link Capacitors in DTC Drive of Induction Motors
Subject Areas : electrical and computer engineeringA. Sadeghi Larijani 1 , M. Shahparasti 2 , M. Mohamadian 3 , A. Yazdian Varjani 4
1 - Tarbiat Modares University
2 - Tarbiat Modares University
3 - Tarbiat Modares University
4 - Tarbiat Modares University
Keywords: Direct torque control induction motor multilevel inverter neutral point voltage,
Abstract :
In this paper a novel direct torque control algorithm based on switching table using three-level diode clamp inverter is introduced. Voltage deviation of DC link capacitors is one of the most significant problems of NPC three-level voltage source inverters. The voltage imbalance of DC link capacitors will result in low level harmonics, undesirable torque variation and motor efficiency reduction. To resolve this problem, a closed loop algorithm is introduced in this paper, in addition to its simple implementation; the algorithm is able to control the voltage fluctuation of DC link capacitors within the desirable limits. The result of simulation and experimental implementation confirms the performance of this method despite capacitors reduced capacity.
[1] I. Takahashi and T. Noguchi, "A new quick - response and high - efficiency control strategy of an induction motor," IEEE Trans. Ind. Applicat., vol. 22, no. 5, pp. 820-827, Sep./Oct. 1986.
[2] K. Lee, J. H. Song, I. Choy, and J. Y. Yoo, "Torque ripple reduction in DTC of induction motor driven by three - level inverter with low switching frequency," IEEE Trans. on Power Elec., vol. 17, no. 2, pp. 255-264, Mar. 2002.
[3] V. Perelmuter, "Three - level inverters with direct torque control," IEEE Industry Applications Conf., vol. 3, pp. 1368-1374, Oct. 2000.
[4] M. F. Escalante, J. Vannier, and A. Arzandé, "Flying capacitor multilevel inverters and DTC motor drive applications," IEEE Trans. on Industrial Elec., vol. 49, no. 4, pp. 809-815, Aug. 2002.
[5] C. A. Martins, X. Roboam, T. A. Meynard, and A. S. Carvalho, "Switching frequency imposition and ripple reduction in DTC drives by using a multilevel converter," IEEE Trans. on Power Elec., vol. 17, no. 2, pp. 286-297, Mar. 2002.
[6] R. Zaimeddine and T. Undeland, "DTC control schemes for induction motor fed by three - level NPC - VSI using space vector modulation," in Proc. Int. Symp. on Power Electronics Drives Automation and Motion, SPEEDAM, pp. 1718-1725, Jun. 2010.
[7] S. Kouro, J. Rebolledo, and J. Rodriguez, "Reduced switching -frequency-modulation algorithm for high-power multilevel inverters," IEEE Trans. on Industrial Electronics, vol. 54, no. 5, pp. 2894-2901, Oct. 2007.
[8] L. G. Franquelo, J. Rodriguez, J. I. Leon, S. Kouro, R. Portillo, and M. A. M. Prats, "The age of multilevel converters arrives," IEEE Industrial Electronics Magazine, vol. 2, no. 2, pp. 28-39, Jun. 2008.
[9] H. Alloui, A. Berkani, and H. Rezine, "A three level NPC inverter with neutral point voltage balancing for induction motors direct torque control," in Proc. XIX Int. Conf. on Electrical Machines, ICEM, 6 pp., Sep. 2010.
[10] C. Liu, B. Wu, D. Xu, N. Zargari, and S. Rizzo, "Progressive natural balance of neutral - point voltage of three level NPC inverter with a modified SVM scheme," in 21st Annual IEEE Applied Power Electronics Conf. and Exposition, APEC, 4 pp., Mar. 2006.
[11] Y. S. Lai, Y. K. Chou, and S. Y. Pai, "Simple PWM technique of capacitor voltage balance for three - level inverter with DC - link voltage sensor only," in Proc. 33rd Annual Conf. of the IEEE Industrial Electronics Society, IECON, pp. 1749-1754, 2007.
[12] A. V. Jouannce, S. Dai, and H. Zhang, "A multilevel inverter approach providing DC-link balancing, ride - through enhancement, and common - mode voltage elimination," IEEE Trans. on Industrial Electronics, vol. 49, no. 4, pp. 739-745, Aug. 2002.
[13] M. Cirrincione, M. Pucci, and G. Vitale, "A novel direct torque control of an induction motor drive with a three-level inverter," in Proc. IEEE Bologna Power Tech Conf., 7 pp., Jun. 2003.
[14] Y. Wenxi, L. Zhengyn, and Z. Rongxiang, "Hysteresis - band control based PWM strategy of three - level neutral - point balance," in Proc. 20th Annual IEEE Applied Power Electronics Conf. and Exposition (APEC), vol. 1, pp. 415-418, Mar. 2005.
[15] M. Cirrincione, M. Pucci, and G. Vitale, "Direct torque control for three - level fed induction motor drives with capacitor voltage ripple minimization," in Proc. 34th Annual Conf. of IEEE Industrial Electronics, IECON, pp. 3238-3245, Nov. 2008.
[16] B. Wu, High - Power Converters and AC Drives, A John Wiley & Sons, Inc., 2006.
[17] A. Sadeghi Larijani, M. Shahparasti, A. Fatemi, A. Amiri, and M. Mohammadian, "DTC drive of induction motor using three - level inverter with optimized switching table and minimizing the deviation of neutral point voltage," in Proc. Power Electronic & Drive Systems & Technologies Conf., PEDSTC, pp. 255-260, May 2010.