Comparative Analysis Between Two-Level and Three-Level DC/AC Electric Vehicle Traction Inverters Using a Novel DC-Link Voltage Balancing Algorithm

This paper presents an extensive comparative study between a two- and three-level inverter for electric vehicle traction applications. An advanced control strategy for balancing the two dc-link capacitors is also proposed. In this paper, the main focus is on the total voltage harmonic distortion (%THDv), the analytical derivation of the three-level capacitor currents, and the voltage balancing of two capacitor voltages. For generating the gate signals, space vector pulse width modulation (SV-PWM) is used. The developed voltage-balancing scheme helps to reduce the number of converter switching sequences, compared with the conventional SV-PWM strategy, and keeps the voltage difference between the two dc-link capacitors at the desired voltage level. The developed test-bench is used for a permanent magnet synchronous machine drive for electric vehicle (EV) applications. Detailed simulation studies are performed using MATLAB/Simulink block set and experimental verification is achieved using dSpace based real-time simulator. Both the simulation and experimental results show a significant improvement in reduction of total harmonic distortion (%THDv) for the three-level inverter.

[1]  D. Boroyevich,et al.  A Carrier-Based PWM Strategy With Zero-Sequence Voltage Injection for a Three-Level Neutral-Point-Clamped Converter , 2012, IEEE Transactions on Power Electronics.

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

[3]  S. Bernet,et al.  A comparison of three-level converters versus two-level converters for low-voltage drives, traction, and utility applications , 2005, IEEE Transactions on Industry Applications.

[4]  A. Massoud,et al.  An SVM Algorithm to Balance the Capacitor Voltages of the Three-Level NPC Active Power Filter , 2008, IEEE Transactions on Power Electronics.

[5]  Stig Munk-Nielsen,et al.  Neutral-point current modeling and control for Neutral-Point Clamped three-level converter drive with small DC-link capacitors , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[6]  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).

[7]  Obrad Dordevic,et al.  A Comparison of Carrier-Based and Space Vector PWM Techniques for Three-Level Five-Phase Voltage Source Inverters , 2013, IEEE Transactions on Industrial Informatics.

[8]  Johann W. Kolar,et al.  Comparative Evaluation of Advanced Three-Phase Three-Level Inverter/Converter Topologies Against Two-Level Systems , 2013, IEEE Transactions on Industrial Electronics.

[9]  Dushan Boroyevich,et al.  A fast space vector modulation algorithm for multilevel three-phase converters , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[10]  Philippe Baudesson,et al.  A New Carrier-Based PWM Providing Common-Mode-Current Reduction and DC-Bus Balancing for Three-Level Inverters , 2007, IEEE Transactions on Industrial Electronics.

[11]  Joan Rocabert,et al.  Closed-Loop Control of a Three-Phase Neutral-Point-Clamped Inverter Using an Optimized Virtual-Vector-Based Pulsewidth Modulation , 2008, IEEE Transactions on Industrial Electronics.

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

[13]  Johann W. Kolar,et al.  Analytical calculation of the RMS current stress on the DC-link capacitor of voltage-PWM converter systems , 2006 .

[14]  Yongdong Li,et al.  Analysis and Calculation of Zero-Sequence Voltage Considering Neutral-Point Potential Balancing in Three-Level NPC Converters , 2010, IEEE Transactions on Industrial Electronics.

[15]  Marcelo A. Pérez,et al.  Multilevel Converters: An Enabling Technology for High-Power Applications , 2009, Proceedings of the IEEE.

[16]  B. P. Schmitt,et al.  Retrofit of fixed speed induction motors with medium voltage drive converters using NPC three-level inverter high-voltage IGBT based topology , 2001, ISIE 2001. 2001 IEEE International Symposium on Industrial Electronics Proceedings (Cat. No.01TH8570).

[17]  F. Wang.  Multilevel PWM VSIs , 2004, IEEE Industry Applications Magazine.

[18]  D. Boroyevich,et al.  Fast-processing modulation strategy for the neutral-point-clamped converter with total elimination of the low-frequency voltage oscillations in the neutral point , 2005, 31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005..

[19]  Changliang Xia,et al.  Adjustable Proportional Hybrid SVPWM Strategy for Neutral-Point-Clamped Three-Level Inverters , 2013, IEEE Transactions on Industrial Electronics.

[20]  Suleiman M. Sharkh,et al.  Loss comparison of 2 and 3-level inverter topologies , 2010 .

[21]  Dushan Boroyevich,et al.  Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter , 2005, IEEE Transactions on Industrial Electronics.

[22]  G. I. Orfanoudakis,et al.  Nearest-Vector Modulation Strategies With Minimum Amplitude of Low-Frequency Neutral-Point Voltage Oscillations for the Neutral-Point-Clamped Converter , 2013, IEEE Transactions on Power Electronics.

[23]  Pragasen Pillay,et al.  Modified DC-link voltage balancing algorithm for a 3-level neutral point clamped (NPC) traction inverter based electric vehicle PMSM drive , 2013, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society.

[24]  G. I. Orfanoudakis,et al.  Loss Comparison of Two- and Three-Level Inverter Topologies , 2010 .

[25]  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.

[26]  Tore M. Undeland,et al.  Comparison of harmonics and common mode voltage in NPC and FLC Multilevel converters , 2010, Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010.

[27]  Yen-shin Lai,et al.  Simple PWM Technique of Capacitor Voltage Balance for Three-Level Inverter with DC-link Voltage Sensor Only , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[28]  D. Boroyevich,et al.  Limits of the neutral-point balance in back-to-back-connected three-level converters , 2004, IEEE Transactions on Power Electronics.

[29]  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.

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

[31]  K.H. Bhalodi,et al.  Space Vector Modulation with DC-Link Voltage Balancing Control for Three-Level Inverters , 2006, 2006 International Conference on Power Electronic, Drives and Energy Systems.

[32]  D. G. Holmes,et al.  Optimal pulse width modulation for three-level inverters , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[33]  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.