	US 11,996,696 B2
	Power supporting arrangement for a power grid
Lexuan Meng, Västerås (SE); Jean-Philippe Hasler, Västerås (SE); Gunnar Ingeström, Västerås (SE); Jan Kheir, Västerås (SE); Tong Wu, Västerås (SE); and Theodore Soong, Västerås (SE)
Assigned to HITACHI ENERGY, LTD, Zürich (CH)
Appl. No. 17/908,046
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Apr. 2, 2020, PCT No. PCT/EP2020/059432 § 371(c)(1), (2) Date Aug. 30, 2022, PCT Pub. No. WO2021/197607, PCT Pub. Date Oct. 7, 2021.
Prior Publication US 2023/0119359 A1, Apr. 20, 2023
Int. Cl. H02J 3/40 (2006.01); H02J 3/18 (2006.01); H02J 3/30 (2006.01); H02M 5/458 (2006.01)

CPC H02J 3/40 (2013.01) [H02J 3/18 (2013.01); H02J 3/30 (2013.01); H02M 5/4585 (2013.01)]

20 Claims

1. A power supporting arrangement for a power grid, the power supporting arrangement comprising:

first, second, third and fourth voltage source converters, each voltage source converter having a respective AC side and a respective DC side;

a DC link interconnecting the DC sides of the first, second, third and fourth voltage source converters;

first and second switching arrangements, each switching arrangement having a number of settable positions;

a first synchronous machine; and

a second synchronous machine;

wherein the AC side of the second voltage source converter is connected to the power grid and the first switching arrangement is connected between the first synchronous machine, the AC side of the first voltage source converter and the power grid, thereby making the first voltage source converter into a machine side converter and the second voltage source converter into a grid side converter;

wherein the AC side of the fourth voltage source converter is connected to the power grid and the second switching arrangement is connected between the second synchronous machine, the AC side of the third voltage source converter and the power grid, thereby making the third voltage source converter into a machine side converter and the fourth voltage source converter into a grid side converter;

wherein the first switching arrangement is operable to selectively connect the first synchronous machine to the power grid in a first configuration and to the AC side of the first voltage source converter in a second configuration, wherein the first synchronous machine is connected to the power grid in a first settable position of the first switching arrangement in the first configuration and to the AC side of the first voltage source converter in a second settable position of the first switching arrangement in the second configuration; and

wherein the second switching arrangement is operable to selectively connect the second synchronous machine to the power grid in a first configuration and to the AC side of the third voltage source converter in the second configuration, wherein the second synchronous machine is connected to the power grid in a first settable position of the second switching arrangement in the first configuration and to the AC side of the third voltage source converter in a second settable position of the second switching arrangement in the second configuration.