US 11,735,917 B2
Systems and methods for paralleling 3-wire and 4-wire 3-phase active harmonic filters
Mohammad Nanda Rahmana Marwali, Irvine, CA (US); and John Simon Batch, Newberg, OR (US)
Assigned to SCHNEIDER ELECTRIC USA, INC., Boston, MA (US)
Filed by SCHNEIDER ELECTRIC USA, INC., Boston, MA (US)
Filed on Sep. 29, 2021, as Appl. No. 17/489,245.
Claims priority of provisional application 63/181,668, filed on Apr. 29, 2021.
Prior Publication US 2022/0360077 A1, Nov. 10, 2022
Int. Cl. H02J 3/01 (2006.01); H02J 3/18 (2006.01)
CPC H02J 3/01 (2013.01) [H02J 3/1842 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power system comprising:
at least one three-wire active harmonic filter (AHF) configured to be coupled to, and provide compensation current to, a three-phase load;
at least one four-wire AHF configured to be coupled to, and provide compensation current to, the three-phase load; and
a controller configured to
determine a total compensation current to provide to the three-phase load, the total compensation current including a zero component and a non-zero component;
determine an output capacity of the at least one three-wire AHF and the at least one four-wire AHF;
calculate a current-compensation ratio based on the output capacity of the at least one three-wire AHF and the at least one four-wire AHF; and
control the at least one four-wire AHF to provide at least a portion of the non-zero component of the total compensation current to the three-phase load based on the current-compensation ratio.