US 12,009,693 B2
Apparatus and method for flux management in impedance isolation single conversion(ZISC) based UPS system
Sridhar Pulikanti, Napier (NZ); Simon Walton, Napier (NZ); Robert Turner, Hastings (NZ); and Nicholas James Elliott, Hastings (NZ)
Assigned to ABB SCHWEIZ AG, Baden (CH)
Appl. No. 17/758,553
Filed by ABB Schweiz AG, Baden (CH)
PCT Filed Jan. 9, 2020, PCT No. PCT/EP2020/050459
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/139891, PCT Pub. Date Jul. 15, 2021.
Prior Publication US 2023/0035249 A1, Feb. 2, 2023
Int. Cl. H02J 9/06 (2006.01); H02J 3/38 (2006.01); H02M 1/40 (2007.01)
CPC H02J 9/062 (2013.01) [H02J 3/388 (2020.01); H02M 1/40 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An apparatus for flux management in an impedance isolation single conversion (ZISC) based uninterruptible power supply (UPS) system, the apparatus comprising:
a first determining unit configured to determine a first offset flux on a series reactor in the ZISC based UPS system when power quality events occur in a grid connected to the ZISC based UPS system and the ZISC based UPS system operates in a grid-connected mode;
a first resetting unit configured to provide synthetic impedance damping to the series reactor to reset the first offset flux;
a second determining unit configured to determine a second offset flux on a transformer in the ZISC based UPS system when the ZISC based UPS system operates in the grid-connected mode or an island mode; and
a second resetting unit configured to reset the second offset flux in response to a magnitude of the second offset flux exceeding a flux magnitude limit.