Publisher : The Korean Institute of Power Electronics
DOI : 10.6113/JPE.2016.16.2.542
Title & Authors
An Improved Central 60° Synchronous Modulation for High Transient Performance with PMSM Stator Flux Control Used in Urban Rail Transit Systems Fang, Xiaochun; Lin, Fei; Yang, Zhongping;
Central 60° synchronous modulation is an easy pulse-width modulation (PWM) method to implement for the traction inverters of urban rail trains at a very low switching frequency. Unfortunately, its switching patterns are determined by a Fourier analysis of assumed steady-state voltages. As a result, its transient responses are not very good with over-currents and high instantaneous torque pulses. In the proposed solution, the switching patterns of the conventional central 60° modulation are modified according to the dynamic error between the target and actual stator flux. Then, the specific trajectory of the stator flux and current vector can be guaranteed, which leads to better system transients. In addition, stator flux control is introduced to get smooth mode switching between the central 60° modulation and the other PWMs in this paper. A detailed flow chart of the control signal transmission is given. The target flux is obtained by an integral of the target voltage. The actual PMSM flux is estimated by a minimum order flux state observer based on the extended flux model. Based on a two-level inverter model, improved rules in the α-β stationary coordinate system and equations of the switching patterns amendment are proposed. The proposed method is verified by simulation and experimental results.
Central 60° synchronous modulation;Modulation modes switch;PMSM;Stator flux control;Transient response;
J. Holtz and X. Qi, “Optimal control of medium-voltage drives-An overview,” IEEE Trans. Ind. Electron., Vol. 60, No. 12, pp. 5472-5481, Dec. 2013.
R. Rathore, H. Holtz, and T. Boller, “Generalized optimal pulsewidth modulation of multilevel inverters for low-switching-frequency control of medium-voltage high-power industrial AC drives,” IEEE Trans. Ind. Electron., Vol. 60, No. 10., pp. 4215-4224, Oct. 2013.
J. Napoles, J. I. Leon, R. Portillo, L. G. Franquelo, and M. A. Aguirre, “Selective harmonic mitigation technique for high-power converters,” IEEE Trans. Ind. Electron., Vol. 57, No. 7, pp. 2315-2323, Jul. 2010.
S. R. Bowes and D. Holliday, “Optimal regular-sampled PWM inverter control techniques,” IEEE Trans. Ind. Electron., Vol. 54, No. 3, pp. 1547-1559. Jun. 2007.
M. Zhou, X. You, and C. Wang, “Research on PWM method under low switching frequency,” Journal of Beijing Jiaotong University, Vol. 34, No. 5, pp. 53-57, Oct. 2010.
W. Li, X. Che, and R. Hao, “Research on PWM method for AC-DC-AC electric locomotive,” Journal of the China Railway Society, Vol. 22, No. 6, pp. 26-31, Dec. 2000.
J. Holtz and B. Beyer, “Optimal synchronous pulsewidth modulation with a trajectory-tracking scheme for high-dynamic performance,” IEEE Trans. Ind. Appl., Vol. 29, No. 6, pp. 1098-1105, Nov./Dec. 1993.
J. Holtz and B. Beyer, “Fast current trajectory control based on synchronous optimal pulsewidth modulation,” IEEE Trans. Ind. Appl., Vol. 31, No. 5, pp. 1110-1120, Sep./Oct. 1995.
J. Holtz and N. Oikonomou, “Fast dynamic control of medium voltage drives operating at very low switching frequency: an overview,” IEEE Trans. Ind. Electron., Vol. 55, No. 3, pp. 1005-1013, Mar. 2008.
J. Holtz and N. Oikonomou, “Synchronous optimal pulsewidth modulation and stator flux trajectory control for medium-voltage drives,” IEEE Trans. Ind. Appl., Vol. 43, No. 2, pp. 600-608, Mar./Apr. 2007.
Y. Wang, X. Wen, X. Guo, F. Zhao, and W. Cong, "The smooth transition research of different PWM modulations for vector control of induction motor in medium voltage high power," in International Conference on Electrical Machines and Systems(ICEMS), pp. 1-5, Aug. 2011.
X. Ma, J. Ren, Q. Ge, and Y. Li, "Full speed range induction motor indirect rotor field oriented control for high speed traction applications," in International Conference on Electrical Machines and Systems(ICEMS), pp. 1407-1412, Oct. 2010.
W. Wang, M. Cheng, B. Zhang, Y. Zhu, and S. Ding, “A fault-tolerant permanent magnet traction module for subway application,” IEEE Trans. Power Electron., Vol. 29, No. 4, pp. 1646-1658, Apr. 2014.
M. Mekhiche, S. Nichols, J. L. Kirtley, and J. Young, "High-speed, high-power density PMSM drive for fuel cell powered HEV application," in IEEE International Electrical Machines and Drives Conference(IEMDC), pp. 658-663, Jun. 2001.
S. Shinnaka, “New sensorless vector control methods based on a new minimum-order flux state-observer in the “D-Module” for permanent magnet synchronous motors,” Electrical Engineering in Japan, Vol. 151, No. 2, pp. 46-62, Apr. 2005.