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Interleaving of voltage source converter legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. Different switching patterns between the converter legs increase the number of Thevenin output voltage levels and, hence, the quality of the waveform but also generate circulating currents within one phase. This paper proposes a controller...
Multilevel converters (MLC) are now a standard solution for medium-voltage (MV) high-power applications and several modulation techniques have been reported in literature. However, high-power applications require low device switching frequencies to reduce the dominating switching losses and thus improve the overall efficiency of drive system. On the other hand, total harmonic distortion (THD) of current...
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...
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