A modified selective harmonic elimination switching strategy for Hybrid Flying Capacitor Multicell converter

Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) switching strategy is commonly applied for the elimination of low order harmonics in the multilevel converter with stepped waveform. In this paper, this switching algorithm is utilized to a Hybrid Flying Capacitor Multicell converter to produce the required fundamental voltage and in the same time cancel out specified higher order harmonics in this converter. Hybrid Flying Capacitor Multicell is a new multilevel converter that reduces elements for same level of output voltage compared with the classic multilevel converters. For a range of the modulation index (m), angels obtain from resultant theory are trained to neural network, since the neural network is trained, give the best angles for the entire modulation index. In resultant theory for a range of the modulation index (m>1.15)in the seven-level converter, the switching angles can be chosen to produce the desired fundamental output while making the fifth and seventh harmonics identically zero. But the main drawback is that for a range of the modulation index (m<1.15) there are not any solutions in resultant theory, to overcome this problem a DCDC buck converter has been used to have adjustable dc source in input of converter to coordination between modulatio nindex and output voltage. The simulation results has been carried out using SIMULINK/MATLAB present the effectiveness of the SHEPWM strategy for the proposed converter.

[1]  Seyed Hossein Hosseini,et al.  A new Mixed Stacked Multicell converter with Interesting Advantages , 2011 .

[2]  Zhong Du,et al.  Control of a multilevel converter using resultant theory , 2003, IEEE Trans. Control. Syst. Technol..

[3]  Tamer H. Abdelhamid,et al.  Selective harmonic elimination of new family of multilevel inverters using genetic algorithms , 2008 .

[4]  J. Rodriguez,et al.  Mixed Multicell Cascaded Multilevel Inverter , 2007, 2007 IEEE International Symposium on Industrial Electronics.

[5]  Brendan McGrath,et al.  Natural Current Balancing of Multicell Current Source Converters , 2007, PESC 2007.

[6]  Richard D. Braatz,et al.  On the "Identification and control of dynamical systems using neural networks" , 1997, IEEE Trans. Neural Networks.

[7]  D.G. Holmes,et al.  Natural Current Balancing of Multicell Current Source Converters , 2007, IEEE Transactions on Power Electronics.

[8]  Mohamad Reza Banaei,et al.  New multilevel inverter with reduction of switches and gate driver , 2011 .

[9]  Seyed Hossein Hosseini,et al.  A new Mixed Stacked Multicell converter with Interesting Advantages , 2011, 2011 2nd Power Electronics, Drive Systems and Technologies Conference.

[10]  Pascal Maussion,et al.  Multiple model control of a Buck dc/dc converter , 2003, Math. Comput. Simul..

[11]  Kumpati S. Narendra,et al.  Identification and control of dynamical systems using neural networks , 1990, IEEE Trans. Neural Networks.

[12]  Seyed Hossein Hosseini,et al.  New configuration of stacked multicell converter with reduced number of dc voltage sources , 2010 .