Improvement of multilevel inverters with magnetic flux modulation for the possibility of their power from hydrogen fuel cells

As part of solving the problem of creating an autonomous source of alternating current electrical energy based on hydrogen fuel cells, the possibilities of preliminary correction of voltage and current shapes of static inverters through the use of power multi-winding transformers are being explored. The value of such correction is further determined by the significant simplification of the selection of elements of filtering devices and pulse-width modulation algorithms necessary to achieve the required parameters of the quality of electrical energy and equalize the current load on stacks of hydrogen fuel cells used as the primary source of DC electrical energy. The advantage of multi-level inverters based on power multi-winding transformers with branched magnetic circuits and the feasibility of combining three singlephase inverters into one three-phase inverter based on three-rod transformers with amplitude modulation of magnetic fluxes and connection of secondary windings in a triangle are shown. An optimization problem of minimizing voltage harmonic coefficients has been formulated and solved, and a circuit solution for a multi-level power frequency inverter has been proposed to create a three-phase power source, which implements preliminary equalization of the current load to preserve the design service life of hydrogen fuel cells.

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