US 12,015,353 B1
Attenuating harmonic current in power transmission lines
Govind Chavan, Union City, CA (US)
Assigned to Smart Wires Inc., Durham, NC (US)
Filed by Smart Wires Inc., Union City, CA (US)
Filed on Jan. 7, 2022, as Appl. No. 17/571,151.
Claims priority of provisional application 63/203,194, filed on Jul. 12, 2021.
Int. Cl. H02M 7/219 (2006.01); H02M 1/12 (2006.01); H02M 7/757 (2006.01)
CPC H02M 7/219 (2013.01) [H02M 1/12 (2013.01); H02M 7/7575 (2013.01)] 21 Claims
OG exemplary drawing
 
15. A power flow control module, for series connection to a power transmission line, comprising:
a full bridge inverter having a DC (direct current) link capacitor; and
a controller coupled to the full bridge inverter the controller is configured to:
separate a harmonic current from a line current of the power transmission line to produce a separated harmonic current;
filter the separated harmonic current to determine a selected harmonic current;
phase lock to the selected harmonic current to provide a phase locked selected harmonic current;
produce a quadrature value based on the phase locked selected harmonic current;
produce a direct value based on a DC link capacitor voltage; and
operate the full bridge inverter in accordance with the quadrature value and the direct value, to inject an impedance into the power transmission line, wherein the injected impedance attenuates the harmonic current in the power transmission line.