A Simple Space Vector PWM Scheme to Operate a Three-Level NPC Inverter at High Modulation Index Including Overmodulation Region, With Neutral Point Balancing

Three-level neutral point clamped (NPC) inverter is a widely used topology of multilevel inverters. However, the neutral point fluctuates for certain switching states. At low modulation index, the fluctuations can be compensated using redundant switching states. But, at higher modulation index and in overmodulation region, the neutral point fluctuation deteriorates the performance of the inverter. This paper proposes a simple space vector pulsewidth modulation scheme for operating a three-level NPC inverter at higher modulation indexes, including overmodulation region, with neutral point balancing. Experimental results are provided

[1]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[2]  J. K. Steinke,et al.  Switching frequency optimal PWM control of a three-level inverter , 1992 .

[3]  H. Akagi,et al.  Analysis of variation of neutral point potential in neutral-point-clamped voltage source PWM inverters , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[4]  Mark Sumner,et al.  Neutral point control for multi-level inverters: theory, design and operational limitations , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[5]  Dong-Choon Lee,et al.  A novel overmodulation technique for space vector PWM inverters , 1997 .

[6]  Dong-Seok Hyun,et al.  A new simplified space-vector PWM method for three-level inverters , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

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

[8]  A.M. Hava,et al.  A novel neutral point potential stabilization technique using the information of output current polarities and voltage vector , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[9]  P. Enjeti,et al.  Generalized discontinuous DC-link balancing modulation strategy for three-level inverters , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).

[10]  Shaoan Dai,et al.  A multilevel inverter approach providing DC-link balancing, ride-through enhancement, and common-mode voltage elimination , 2002, IEEE Trans. Ind. Electron..

[11]  Fang Zheng Peng,et al.  Multilevel inverters: a survey of topologies, controls, and applications , 2002, IEEE Trans. Ind. Electron..

[12]  Bimal K. Bose,et al.  Space vector pulse width modulation of three-level inverter extending operation into overmodulation region , 2003 .

[13]  G. Joos,et al.  Extending the operating range of the neuro-computing vector classification space vector modulation algorithm of three-level inverters into overmodulation region , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[14]  D. G. Holmes,et al.  Optimized space vector switching sequences for multilevel inverters , 2003 .

[15]  D. Boroyevich,et al.  The nearest three virtual space vector PWM - a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter , 2004, IEEE Power Electronics Letters.

[16]  D. G. Holmes,et al.  Optimal pulse-width modulation for three-level inverters , 2005, IEEE Transactions on Power Electronics.

[17]  A.K. Gupta,et al.  A General Space Vector PWM Algorithm for a Multilevel Inverter Including Operation in Overmodulation Range, with a Detailed Modulation Analysis for a 3-level NPC Inverter , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[18]  S. K. Panda,et al.  Direct method of overmodulation with integrated closed loop stator flux vector control , 2004, IEEE Transactions on Power Electronics.