Direct power and torque control for three-level NPC based PWM ac/dc/ac converter

This paper presents a new control scheme for three-level neutral point clamped (NPC) based PWM ac/dc/ac converter. The direct power control (DPC) for front-end three-level PWM rectifier and direct torque control (DTC) for back-end three-level PWM inverter-fed induction motor are adopted respectively. A power feed-forward control loop from inverter to rectifier side is introduced to obtain better dynamic performance for the dc-link. Simulation results show that with the proposed control scheme, the three-level NPC based PWM ac/dc/ac converter exhibits excellent dynamic performance, and can minimize dc-bus voltage fluctuations.

[1]  Jinhwan Jung,et al.  A feedback linearizing control scheme for a PWM converter-inverter having a very small DC-link capacitor , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[2]  Namho Hur,et al.  Fast dynamic DC-link power balancing scheme for a PWM converter-inverter system , 1999, IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029).

[3]  Namho Hur,et al.  A fast dynamic DC-link power-balancing scheme for a PWM converter-inverter system , 2001, IEEE Trans. Ind. Electron..

[4]  Girish Kumar Singh,et al.  A simple indirect field-oriented control scheme for multiconverter-fed induction motor , 2005, IEEE Transactions on Industrial Electronics.

[5]  Yaohua Li,et al.  A novel fast current-control method for the back-to-back converters , 2004, 2004 IEEE International Conference on Industrial Technology, 2004. IEEE ICIT '04..

[6]  M. P. Kazmierkowski,et al.  Improved direct torque and flux vector control of PWM inverter-fed induction motor drives , 1995, IEEE Trans. Ind. Electron..

[7]  Z. M. Zhao,et al.  Compensation of control delay and discrete control error in predictive direct power control for three-level PWM rectifier , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[8]  Zhao Zhengming,et al.  A novel control scheme for three-level NPC back-to-back converter , 2008, 2008 IEEE Vehicle Power and Propulsion Conference.

[9]  S. Aurtenechea,et al.  Predictive Direct Power Control - A New Control Strategy for DC/AC Converters , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[10]  Leon M. Tolbert,et al.  Multilevel converters for large electric drives , 1999 .

[11]  Mariusz Malinowski,et al.  A comparative study of control techniques for PWM rectifiers in AC adjustable speed drives , 2003 .

[12]  Helmut Kohlmeier,et al.  Highly Dynamic Four-Quadrant AC Motor Drive with Improved Power Factor and On-Line Optimized Pulse Pattern with PROMC , 1987, IEEE Transactions on Industry Applications.