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 DC-DC buck converter has been used to have adjustable dc source in input of converter to coordination between modulation 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.