US 11,735,927 B2
System and method for supplying electric power to a grid and for supporting the grid
Paul Brian Brogan, Glasgow (GB); Douglas Elliott, Glasgow (GB); Thyge Knueppel, Værløse (DK); and Philip Perry Waite, Newcastle (GB)
Assigned to SIEMENS GAMESA RENEWABLE ENERGY A/S
Appl. No. 17/601,992
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
PCT Filed Mar. 31, 2020, PCT No. PCT/EP2020/059026
§ 371(c)(1), (2) Date Oct. 7, 2021,
PCT Pub. No. WO2020/216581, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 19170521 (EP), filed on Apr. 23, 2019.
Prior Publication US 2022/0216696 A1, Jul. 7, 2022
Int. Cl. H02J 3/38 (2006.01); H02J 3/32 (2006.01); H02J 3/36 (2006.01); H02J 3/40 (2006.01); H02J 3/46 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 3/32 (2013.01); H02J 3/36 (2013.01); H02J 3/40 (2013.01); H02J 3/46 (2013.01); H02J 2300/28 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A system for supplying electric power to a grid and for supporting the grid, the system comprising
a power generator having a main converter coupled to the grid,
an energy buffer having an energy storage and a secondary converter coupled to the grid in parallel with the main converter,
a grid stability monitor configured to provide a grid stability indication representative of a stability level of the grid, and
a controller configured to control the main converter and the secondary converter in dependency on the grid stability indication such that
when the stability level is at least equal to a predetermined threshold value, the main converter is controlled to operate as a virtual synchronous machine and the secondary converter is controlled to operate to maintain a predetermined amount of energy in the energy storage, and
when the stability level is below the predetermined threshold value, the secondary converter is operated to provide a predetermined response in order to support the grid stability.