A hybrid cascade converter topology with series-connected symmetrical and asymmetrical diode-clamped H-bridge cells
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A novel H-bridge multilevel pulsewidth modulation converter topology based on a series connection of a high-voltage diode-clamped inverter and a low-voltage conventional inverter is proposed in this paper. A dc link voltage arrangement for the new hybrid and asymmetric solution is presented to have a aximumnumber of output voltage levels by preserving the adjacent switching vectors between voltage levels. Hence, a 15-level hybrid converter can be attained with a minimum number of power components. A comparative study has been carried out to present high performance of the proposed configuration to approach a very low total harmonic distortion of voltage and current, which leads to the possible elimination of the output filter. Regarding the proposed configuration, a new cascade inverter is verified by cascading an asymmetrical diode-clamped inverter, in which 19 levels can be synthesized in output voltage with the same number of components. To balance the dc link capacitor voltages for the maximum output voltage resolution as well as synthesize asymmetrical dc link combination, a new multi-output boost converter is utilized at the dc link voltage of a seven-level H-bridge diode-clamped inverter. Simulation and hardware results based on different modulations are presented to confirm the validity of the proposed approach to achieve a high-quality output voltage.
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A hybrid cascade converter topology with series-connected symmetrical and asymmetrical diode-clamped H-bridge cellsNami, A.; zare, F.; Ghosh, Arindam; Blaabjerg, F. (2011)A novel H-bridge multilevel pulsewidth modulation converter topology based on a series connection of a high-voltage diode-clamped inverter and a low-voltage conventional inverter is proposed in this paper. A dc link voltage ...
Voltage-sharing converter to supply single-phase asymmetrical four-level diode-clamped inverter with high power factor loadsBoora, A.; Nami, A.; zare, F.; Ghosh, Arindam; Blaabjerg, F. (2010)The output voltage quality of some of the single-phase multilevel inverters can be improved when their dc-link voltages are regulated asymmetrically. Symmetrical and asymmetrical multilevel diode-clamped inverters have ...
A new unequal DC link voltage configuration for a single phase multilevel converter to reduce low order harmonicsGhasemi, N.; zare, F.; Langton, C.; Ghosh, Arindam (2011)Multilevel converters are used in high power and high voltage applications due to their attractive benefits in generating high quality output voltage. Increasing the number of voltage levels can lead to a reduction in ...