For a total load that is 90% from VFDs it appears that a 12 pulse drive may satisfy IEEE 519, but an 18 pulse drive will without question. What is the relative cost differential between a 12 and an 18? Is it reasonable to think of a 6 pulse drive as needing a lot of linear load dilution, a 12-pulse needing less and an 18 pulse needing almost none?
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