Continuous PWM Techniques for Sinusoidal Voltage Generation with Seven-Phase Voltage Source Inverters

Multi-phase motor drives are typically supplied from two-level voltage source inverters (VSIs). It is thus necessary to develop pulse width modulation (PWM) schemes for inverter control in order to utilise the benefits offered by multiphase motor drives. This paper deals with seven-phase VSI and develops continuous PWM schemes that enable generation of sinusoidal voltages at the output. Carrier-based sinusoidal PWM, sinusoidal PWM with the 7th harmonic injection, and sinusoidal PWM with the triangular zero-sequence injection, as well as the space vector PWM are elaborated. Presented PWM schemes are analysed in terms of DC bus utilisation and direct correlation between carrier-based and space vector approach is established. All schemes are implemented in a digital signal processor and are compared through experimentation on a seven-phase custom-designed VSI supplying a seven-phase star-connected static load.

[1]  M.B.R. Correa,et al.  Vector and scalar modulation for six-phase voltage source inverters , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[2]  Seung-Ki Sul,et al.  Analysis of multiphase space vector pulse width modulation based on multiple d-q spaces concept , 2005, The 4th International Power Electronics and Motion Control Conference, 2004. IPEMC 2004..

[3]  Seung-Ki Sul,et al.  Analysis of multiphase space vector pulse-width modulation based on multiple d-q spaces concept , 2005, IEEE Transactions on Power Electronics.

[4]  M. Durán,et al.  Multi-Phase Space Vector Pulse Width Modulation: Applications and Strategies. , 2007 .

[5]  Alberto Tenconi,et al.  Complete analysis and comparative study of digital modulation techniques for dual three-phase AC motor drives , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[6]  Zhiqiao Wu,et al.  Pulse-Width Modulation for Five-Phase Converters Based on Device Turn-on Times , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[7]  Atif Iqbal,et al.  Space Vector PWM Techniques for Sinusoidal Output Voltage Generation with a Five-Phase Voltage Source Inverter , 2006 .

[8]  A. Tani,et al.  Space vector modulation of a seven-phase voltage source inverter , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[9]  T.A. Lipo,et al.  Torque density improvement in a six-phase induction motor with third harmonic current injection , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[10]  O. Ojo,et al.  Generalized discontinuous carrier-based PWM modulation scheme for multi-phase converter-machine systems , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[11]  Yifan Zhao,et al.  Space vector PWM control of dual three phase induction machine using vector space decomposition , 1994 .

[12]  Slobodan N. Vukosavic,et al.  Generalised Sinusoidal PWM with Harmonic Injection for Multi-Phase VSIs , 2006 .

[13]  Abderrezak Rezzoug,et al.  Space vector PWM techniques for dual three-phase AC machine: analysis, performance evaluation and DSP implementation , 2003 .

[14]  D. Hadiouche,et al.  Space-vector PWM techniques for dual three-phase AC machine: analysis, performance evaluation, and DSP implementation , 2006, IEEE Transactions on Industry Applications.

[15]  John E. Fletcher,et al.  Development of space vector modulation strategies for five phase voltage source inverters , 2004 .