System and method for reducing reactive current on a common DC bus with multiple inverters
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United States of America Patent
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Dec 6, 2016
Grant Date -
Dec 11, 2014
app pub date -
Jun 5, 2013
filing date -
Jun 5, 2013
priority date (Note) -
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Abstract
A system configured to reduce the amplitude of reactive current present on a DC bus shared by multiple inverters is disclosed. The start of the switching period for the modulation routines of each inverter is synchronized, and a carrier phase angle is determined for a carrier signal within each of the inverters. The modulation routine of each inverter generates a reactive current on the shared DC bus. By controlling the carrier phase angle for each inverter, the reactive current of a first inverter may be generated at a phase angle that is offset from the phase angle of the reactive current generated by a second inverter. As a result, the reactive current from the first inverter cancels at least a portion of the reactive current from the second inverter, reducing the total reactive current present on the DC bus.
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