Three-phase multilevel converter voltage quality bounds

Multilevel converters synthesize a staircase voltage waveform, resulting in a high voltage quality. Using a practical time domain approach, lower and upper bounds for voltage quality of three-phase multilevel converters are derived. The voltage quality bounds are introduced as closed-form analytical expressions for an arbitrary number of voltage levels and different modulation indices. They allow an analytical description of the behavior of multilevel converters. In comparison with PWM voltage quality, the lower and upper bounds may be useful for a fair classification of different switching methods and a first layout of multilevel converters.

[1]  Alex Ruderman,et al.  Evaluation of motor PWM loss increase due to zero common-mode voltage modulation strategy of multilevel converter , 2010, Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010.

[2]  Gert Mehlmann,et al.  18-pulse cascaded-multilevel-converter , 2011, 11th International Conference on Electrical Power Quality and Utilisation.

[3]  Leon M. Tolbert,et al.  17 – Multilevel Power Converters , 2007 .

[4]  Johann W. Kolar,et al.  High efficiency drive system with 3-level T-type inverter , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[5]  Ruifang Liu,et al.  Modeling of Iron Losses of Electrical Machines and Transformers Fed by PWM Inverters , 2007, 2007 IEEE Power Engineering Society General Meeting.

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

[7]  Ruifang Liu,et al.  Modeling of Eddy-Current Loss of Electrical Machines and Transformers Operated by Pulsewidth-Modulated Inverters , 2008, IEEE Transactions on Magnetics.

[8]  L.M. Tolbert,et al.  Harmonic optimization of multilevel converters using genetic algorithms , 2004, IEEE Power Electronics Letters.

[9]  Katsumi Yamazaki,et al.  Experimental validation of iron loss model for rotating machines based on direct eddy current analysis of electrical steel sheets , 2009, 2009 IEEE International Electric Machines and Drives Conference.

[11]  Tian-Hua Liu,et al.  Optimum harmonic reduction with a wide range of modulation indexes for multilevel converters , 2002, IEEE Trans. Ind. Electron..

[12]  Shaahin Filizadeh,et al.  An Optimized Space Vector Modulation Sequence for Improved Harmonic Performance , 2009, IEEE Transactions on Industrial Electronics.

[13]  G. Herold,et al.  The generation of symmetrical space phasors compared with the selective harmonic elimination method of multilevel converters , 2010, Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference.