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Multilevel converters have found popularity in electric-drive vehicles. In cascaded H-bridge multilevel converters, it is advantageous to use only one DC voltage source for the main H-bridge cell and supply the rest of the cells with capacitors. However, regulating the capacitors' voltage level becomes a challenging issue. This paper studies the existing constraints on regulating the capacitor voltage...
Using multilevel inverters in fuel cell & solar cell & wind turbines is increasing. Harmonic reduction techniques in multilevel inverters are considered. Mathematical methods for reducing the harmonic are presented in some of the literatures Mathematical methods are not suitable for high level inverters. These methods analyze harmonics with constant output voltage of each inverter.
This paper presents a new variation of selective harmonic elimination (SHE) technique for cascaded multilevel converter with variant DC voltage sources. The paper formulates the problem in a way which the levels of the DC sources are made variables within certain constraints. Therefore, the degrees of freedom for specifying the cost function are doubled when compared to existing family of techniques...
Advances in power electronics technology allowed the wide investigation of multilevel converters that provide high safety voltages with less harmonic components compared to the two-level structures .Because of prominent advantages like more utilization of input voltage, flexibility in switching the legs of three phase inverters and easy method of improving spectral performance and easy digital implantation,...
In this paper a new structure for asymmetric multilevel converters is presented. The new topology is consisting of N series-connected of two interconnected multilevel converters per phase. The presented circuit is an optimized multilevel converter with minimum DC voltage sources and switches. The investigated topology can generate a large number of levels (odd and even) without increasing the number...
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