US 12,341,363 B2
Method for generating a polyphase alternating current, circuit arrangement and energy supply system
Anya Xie, Ulm (DE)
Assigned to SAX Power GmbH, Erbach (DE)
Filed by SAX Power GmbH, Erbach (DE)
Filed on May 7, 2024, as Appl. No. 18/657,121.
Claims priority of application No. 10 2023 112 571.0 (DE), filed on May 12, 2023; and application No. 23173056 (EP), filed on May 12, 2023.
Prior Publication US 2024/0380220 A1, Nov. 14, 2024
Int. Cl. H02J 7/00 (2006.01); H01M 10/42 (2006.01); H01M 10/44 (2006.01); H02J 1/08 (2006.01); H02M 1/00 (2006.01); H02M 7/5387 (2007.01)
CPC H02J 7/0014 (2013.01) [H01M 10/425 (2013.01); H01M 10/441 (2013.01); H02J 1/08 (2013.01); H02J 7/0063 (2013.01); H02M 1/007 (2021.05); H02M 7/53871 (2013.01); H01M 2010/4271 (2013.01); H02J 2207/20 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A method for generating a polyphase alternating current, in particular a three-phase alternating current, by interconnecting a plurality of DC voltage sources, having at least the following method steps:
providing a configurable DC voltage string for each phase (L1, L2, L3) of the polyphase alternating current, wherein each configurable DC voltage string is formed from a plurality of the DC voltage sources which can be interconnected in a configurable series circuit;
arranging the configurable DC voltage strings in a polygon circuit, in particular in a delta circuit;
providing a neutral grounding transformer for the purpose of achieving a common neutral point (N) of all configurable DC voltage strings; and
configuring the configurable DC voltage strings such that the polyphase alternating current is provided and a zero phase-sequence system current is also formed for charge equalization between the configurable DC voltage strings,
wherein a q component of the zero phase-sequence system current is minimized and/or a target value of a d component of the zero phase-sequence system current is determined taking into account a charge difference between the DC voltage sources of the DC voltage strings.