Torque and Flux Ripple Elimination in DTC Control of PMSM Motors using Duty Cycle Control of Voltage Vectors
Subject Areas : electrical and computer engineeringV. Ghasemian 1 , S. A. Gholamian 2 , S. M. Mirimani 3
1 -
2 - Babol Noshirvani University of Technology
3 -
Abstract :
This paper presents a novel method for controlling torque and stator flux ripples in DTC control of PMSM motor. In contrast to conventional duty ratio modulation methods which do not pay attention to stator flux condition, the proposed method controls both torque and stator flux RMS ripples using minimization of a proper two variable (stator flux and torque) objective function. After realizing that, flux related machine specifications such as circular stator flux vector trajectory and current waveform quality will be developed. For this purpose, in addition to torque dynamics in any DTC control cycle, stator flux dynamics will be studied. Using this, the condition of both torque and stator flux at the end of an applied voltage vector of inverter is predicted. Then, standard deviation of torque RMS ripple and that of stator flux is studied in any control cycle and the normalized sum of these two deviations will be considered as the objective function. Finally, a proper switching instant during any control cycle is calculated for minimizing the objective function. The proposed method is validated by MATLAB simulation.
[1] L. Zhong, M. F. Rahman, W. Y. Hu, and K. W. Lim, "Analysis of direct torque control in permanent magnet synchronous motor drives," IEEE Trans. Power Electronics, vol. 12, no. 3, pp. 528-536, May 1997.
[2] F. Niu, B. Wang, A. S. Babel, K. Li, and E. G. Strangas, "Comparative evaluation of direct torque control strategies for permanent magnet synchronous machines," IEEE Trans. Power Electronics, vol. 31, no. 2, pp. 1408-1424, Feb. 2016.
[3] L. Tang, L. Zhong, and M. F. Rahman, "A novel direct torque control for interior permanent-magnet synchronous machine drive with low ripple in torque and flux-a speed-sensorless approach," IEEE Trans. Ind. Appl., vol. 39, no. 6, pp. 1748-1756, Nov./ Dec. 2003.
[4] M. Pacas and J. Weber, "Predictive direct torque control for the PM synchronous machine," IEEE Trans. Ind. Electron., vol. 52, no. 5, pp. 1350-1356, Oct. 2005.
[5] M. Preindl and S. Bolognani, "Model predictive direct torque control with finite control set for PMSM drive systems, part 1: maximum torqu per ampere operation," IEEE Trans. Ind. Inf., vol. 9, no. 4, pp. 1912-1921, Nov. 2013.
[6] Y. Inoue, S. Morimoto, and M. Sanada, "Examination and linearization of torque control system for direct torque controlled IPMSM," IEEE Trans. Ind. Appl., vol. 46, no. 1, pp. 159-166, Jan./Feb. 2010.
[7] 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. Power Electronics, vol. 17, no. 2, pp. 286-297, Mar. 2002.
[8] C. Ortega, A. Arias, C. Caruana, J. Balcells, and G. M. Asher, "Improved waveform quality in the direct torque control of matrix-converter-fed PMSM drives," IEEE Trans. Industrial Electronics, vol. 57, no. 6, pp. 2101-2110, Jun. 2010.
[9] D. Casadei, G. Serra, and A. Tani, "Implementation of a direct control algorithm for induction motors based on discrete space vector modulation," IEEE Trans. Power Electronics, vol. 15, no. 4, pp. 769-777, Jul. 2000.
[10] Y. Zhang, J. Zhu, Z. Zhao, W. Xu, and D. G. Dorrell, "An improved direct torque control for three-level inverter-fed induction motor sensorless drive," IEEE Trans. Power Electronics, vol. 27, no. 3, pp. 1502-1513, Mar. 2012.
[11] Y. Zhang and J. Zhu, "Direct torque control of permanent magnet synchronous motor with reduced torque ripple and commutation frequency," IEEE Trans. Power Electron., vol. 26, no. 1, pp. 235-248, Jan. 2011.
[12] K. Shyu, J. Lin, V. Pham, M. Yang, and T. Wang, "Global minimum torque ripple design for direct torque control of induction motor drives," IEEE Trans. Industrial Electronics, vol. 57, no. 9, pp. 3148-3156, Sep. 2010.
[13] Y. Zhang and J. Zhu, "A novel duty cycle control strategy to reduce bothtorque and flux ripples for DTC of permanent magnet synchronous motordrives with switching frequency reduction," IEEE Trans. Power Electron.,vol. 26, no. 10, pp. 3055-3067, Oct. 2011.
[14] Y. Ren, Z. Q. Zhu, and J. Liu, "Direct torque control of permanent magnet synchronous machine drives with a simple duty ratio regulator," IEEE Trans. Industrial Electronics, vol. 61, no. 10, pp. 5249-5258, Oct. 2014.
