US 12,244,218 B2
Power grid
ChunMing Yuan, Beijing (CN); Peter Steimer, Ehrendingen (CH); Adrian Timbus, Mellingen (CH); Philippe Maibach, Muhen (CH); Juergen Steinke, Albbruck (DE); Stephane Isler, Faucigny (FR); and Ralph Burkart, Zürich (CH)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 18/022,551
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Oct. 15, 2021, PCT No. PCT/EP2021/078692
§ 371(c)(1), (2) Date Feb. 22, 2023,
PCT Pub. No. WO2022/079288, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 202011108646.3 (CN), filed on Oct. 16, 2020; and application No. 20203159 (EP), filed on Oct. 21, 2020.
Prior Publication US 2023/0318435 A1, Oct. 5, 2023
Int. Cl. H02M 1/00 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/0067 (2021.05) [H02M 3/33576 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power grid, comprising
a converting stage comprising a plurality of DC/DC converters;
at least one of the DC/DC converters being a single-stage isolated DC/DC converter comprising a voltage control configured to control a voltage of the respective DC/DC converter;
the DC/DC converters being connected in series;
wherein at least one of the plurality of converters of the converting stage is configured to provide a respective predetermined output voltage to a load;
each of the plurality of DC/DC converters comprising a plurality of DC/AC converters, a plurality of AC/DC converters, wherein the at least one DC/AC converter and the at least one AC/DC converter are configured to be connected to a transformer unit, the transformer unit comprising a plurality of transformers coupling the plurality of DC/AC converters to the plurality of AC/DC converters; and
at least two of the plurality of transformers being connected by an impedance circuit;
the impedance circuit comprising a winding and an impedance for at least two of the plurality of AC/DC converters; and
the windings and the impedances being interconnected.