Natural Harmonic Elimination of Square-Wave Inverter for Medium-Voltage Application

In this paper, a low-frequency square-wave inverter with a series-connected pulsewidth modulation (PWM) inverter is investigated for high-power applications. The series compensators produce only the desired harmonic voltages to make the net output voltage sinusoidal with small PWM switching harmonics only. An open-loop control strategy for the series compensator is proposed in this paper. This strategy indirectly sets the compensator DC bus voltage to the desired level. No external DC source or active power at fundamental frequency is required to control this dc bus voltage. Different variations of this basic strategy are presented in this paper for medium-voltage applications. Theoretical analysis of this strategy is presented in this paper with simulation and experimental results.

[1]  H. Akagi,et al.  Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration , 2007, IEEE Transactions on Industry Applications.

[2]  V. Agelidis,et al.  Selective Harmonic Elimination PWM Control for Cascaded Multilevel Voltage Source Converters: A Generalized Formula , 2008, IEEE Transactions on Power Electronics.

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

[4]  S. Bernet,et al.  Design and comparison of 4.16 kV neutral point clamped, flying capacitor and series connected H-bridge multi-level converters , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[5]  T. Lipo,et al.  Hybrid multilevel power conversion system: a competitive solution for high power applications , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[6]  T.A. Meynard,et al.  Natural Balance of Multicell Converters: The General Case , 2006, IEEE Transactions on Power Electronics.

[7]  T.A. Meynard,et al.  Natural Balance of Multicell Converters: The Two-Cell Case , 2006, IEEE Transactions on Power Electronics.

[8]  K. Smedley,et al.  Synthesis of Multilevel Converters Based on Single-and/or Three-phase Converter Building Blocks , 2008, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[9]  Zhong Du,et al.  Hybrid cascaded multilevel inverter with PWM control method , 2008, 2008 IEEE Power Electronics Specialists Conference.

[10]  Keith Corzine,et al.  A cascaded multi-level H-bridge inverter utilizing capacitor voltages sources , 2003 .

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

[12]  Alfred Rufer,et al.  A three-phase multilevel converter for high-power induction motors , 1998 .

[13]  Zhong Du,et al.  Inductorless DC-AC Cascaded H-Bridge Multilevel Boost Inverter for Electric/Hybrid Electric Vehicle Applications , 2007, 2007 IEEE Industry Applications Annual Meeting.