Harmonically modified twelve-pole inverter

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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363 98, 363132, H02M 744

Patent

active

051385449

ABSTRACT:
Apparatus and method for a twelve-pole inverter for eliminating all of the relevant low-order harmonic component frequencies, except the fundamental for an AC output from a source of DC input voltage. The inverter circuit provides four separate three-phase sets of constantly phase displaced pole voltages from controlled six-pulse bridge inverter circuits. Additional phase displacements for straddled paired-sets of the pole voltages are introduced with a first and second predetermined phase displacement proportion of 2:1 or 15 degrees. One paired-set of pole voltages is input to a transformer configuration of a wye with a delta, and the other paired-set of pole voltages is input to a neutralizing transformer with a truncated delta paired configuration for low-order cancellation of harmonics. A phase separated composite output circuit connects series aiding and series opposing secondary winding components coupled from the two sets of paired transformer windings to provide coupled fundametal voltages with low-order odd harmonic components eliminated below twenty-three times the fundamental frequency.

REFERENCES:
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Sales Brochure: "Bendix VSCF Technology-Allied Signal Technology", (Bendix Electric Power Division), Circa 1989, 15 pages, especially p. 6, 7 relating to Operation of a Typical Bendix "DC-Link" AC to AC Converter described with respect to FIGS. 3-6.

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