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Improved power factor by variable frequency drive

One of the characteristics of a passive rectifier fed voltage source inverter type variable frequency drive is the near constant operational power factor of 0,95 from light to full load condition.

This feature does not depend on the pole number of the connected motor. VSIs with an active rectifier input can operate at unity or a leading power factor, if uitably sized, and therefore can be used to compensate for the lagging power factor loads that are also part of the plant network. Thus the need for additional power factor correction equipment or static VAR compensation equipment is eliminated or, at worst, reduced.

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