A novel control scheme for three-level NPC back-to-back converter

This paper presents a novel control scheme for three-level neutral point clamped (NPC) back-to-back converter. The distribution and balance of instantaneous energy for the converter is analyzed, and the direct power control with space vector modulation (DPC_SVM) for front-end rectifier and rotor field oriented control (FOC) for back-end 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. Experimental results show that with the proposed control scheme, the three-level NPC back-to-back converter exhibits excellent dynamic performance, and can minimize DC-bus voltage fluctuations with low size of DC-bus capacitors.

[1]  Dushan Boroyevich,et al.  A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters , 2000 .

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

[3]  Bimal K. Bose,et al.  Modern Power Electronics and AC Drives , 2001 .

[4]  Zhao Zhengming,et al.  Performance evaluation of three control strategies for three-level neutral point clamped PWM rectifier , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[5]  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.

[6]  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..

[7]  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).