A Vector Space Decomposition Based Space Vector PWM Algorithm for a Three-Level Seven-Phase Voltage Source Inverter

This paper presents a novel modulation strategy for a seven-phase three-level inverter, aimed at variable-speed drive applications. Developed space vector pulsewidth modulation (SVPWM) strategy is based on vector space decomposition (VSD) approach and an analysis of multidimensional space vector projections in mutually orthogonal planes. The algorithm represents an extension of a recently developed five-phase three-level SVPWM algorithm and is considerably more complex, due to the existence of three mutually orthogonal planes in a seven-phase system. The difficulties of generalization of space vector strategies, which stem from the nature of the multiphase systems, are highlighted. Increasing the number of phases from five to seven increases the number of switching states from 35 = 243 to 37 = 2187 and the number of orthogonal planes from two to three. This considerably affects the complexity of the offline calculations. However, the final implementation of the algorithm is simple. Developed SVPWM algorithm is compared to an equivalent carrier-based strategy and it is shown that they yield identical performance. The complexity of the algorithms for real-time implementation is compared. Simulation and experimental results, obtained using neutral-point clamped inverter, verify the theoretical developments.

[1]  G. Sciutto,et al.  A new multilevel PWM method: a theoretical analysis , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[2]  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).

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

[4]  H.A. Toliyat,et al.  A novel concept of a multiphase, multimotor vector controlled drive system supplied from a single voltage source inverter , 2004, IEEE Transactions on Power Electronics.

[5]  Bin Wu,et al.  High-Power Converters and AC Drives , 2006 .

[6]  Bin Wu,et al.  High-Power Converters and ac Drives: Wu/High-Power Converters and ac Drives , 2006 .

[7]  Fei Yu,et al.  Research on PWM techniques of five-phase three-level inverter , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[8]  Zhiqiao Wu,et al.  A five phase three-level neutral point clamped converter using DSP and FPGA based control scheme , 2006 .

[9]  Hamid A. Toliyat,et al.  Multiphase induction motor drives - : a technology status review , 2007 .

[10]  Ganesh K. Venayagamoorthy,et al.  Optimal SVM switching for a multilevel multi-phase machine using modified discrete PSO , 2008, 2008 IEEE Swarm Intelligence Symposium.

[11]  J. Soltani,et al.  Direct torque control of a two five-phase series connected Induction Machine drive using a three-level five-phase space vector PWM inverter , 2008, 2008 IEEE International Conference on Industrial Technology.

[12]  Emil Levi,et al.  Multiphase Electric Machines for Variable-Speed Applications , 2008, IEEE Transactions on Industrial Electronics.

[13]  Francisco D. Freijedo,et al.  Multilevel Multiphase Space Vector PWM Algorithm , 2008, IEEE Transactions on Industrial Electronics.

[14]  G. Grandi,et al.  Analytical Determination of DC-Bus Utilization Limits in Multiphase VSI Supplied AC Drives , 2008, IEEE Transactions on Energy Conversion.

[15]  J. Doval‐Gandoy,et al.  Multilevel Multiphase Space Vector PWM Algorithm With Switching State Redundancy , 2009, IEEE transactions on industrial electronics (1982. Print).

[16]  E. Levi,et al.  Number of switching state vectors and space vectors in multilevel multiphase converters , 2009 .

[17]  A. Ruderman,et al.  Time domain evaluation of filterless grid-connected multilevel PWM converter voltage quality , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[18]  Leopoldo García Franquelo,et al.  Conventional Space-Vector Modulation Techniques Versus the Single-Phase Modulator for Multilevel Converters , 2010, IEEE Transactions on Industrial Electronics.

[19]  John E. Fletcher,et al.  A Space Vector Switching Strategy for Three-Level Five-Phase Inverter Drives , 2010, IEEE Transactions on Industrial Electronics.

[20]  A. Ruderman,et al.  PWM power converter voltage quality bounds and their applicability to non-PWM control schemes , 2010, 2010 12th International Conference on Optimization of Electrical and Electronic Equipment.

[21]  Martin Jones,et al.  Analysis of Output Current-Ripple RMS in , 2010 .

[22]  Francisco D. Freijedo,et al.  Multilevel Multiphase Feedforward Space-Vector Modulation Technique , 2010, IEEE Transactions on Industrial Electronics.

[23]  Keng-Yuan Chen,et al.  Analytical Solutions of Multilevel Space-Vector PWM for Multiphase Voltage Source Inverters , 2011, IEEE Transactions on Power Electronics.

[24]  M. Jones,et al.  A comparison of PWM techniques for three-level five-phase voltage source inverters , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[25]  Olorunfemi Ojo,et al.  Carrier based PWM scheme for a three-level diode-clamped five-phase voltage source inverter ensuring capacitor voltage balancing , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[26]  M. Jones,et al.  A space vector PWM algorithm for a three-level seven-phase voltage source inverter , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.