US 12,170,451 B2
Method for controlling battery energy storage system and battery energy storage system
Mikko Qvintus, Helsinki (FI); and Samuli Ripatti, Helsinki (FI)
Assigned to ABB Schweiz AG, Baden (CH)
Appl. No. 17/593,532
Filed by ABB Schweiz AG, Baden (CH)
PCT Filed Mar. 22, 2019, PCT No. PCT/EP2019/057210
§ 371(c)(1), (2) Date Sep. 20, 2021,
PCT Pub. No. WO2020/192861, PCT Pub. Date Oct. 1, 2020.
Prior Publication US 2022/0166231 A1, May 26, 2022
Int. Cl. H02J 7/00 (2006.01); H01M 10/48 (2006.01)
CPC H02J 7/0019 (2013.01) [H02J 7/0048 (2020.01); H01M 10/482 (2013.01); H02J 2207/20 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling a battery energy storage system comprising at least three battery energy storage units, a DC power connection and a switching arrangement provided between said at least three battery energy storage units and the DC power connection, wherein the switching arrangement is configured to couple and decouple individually each of said at least three battery energy storage units to and from the DC power connection, the method comprising:
a) selecting a plurality of battery energy storage units from among said at least three battery energy storage units, the plurality of battery energy storage units being less than a total of said at least three battery energy storage units, wherein said selecting is performed:
such that a sum of short circuit currents of the selected plurality of battery energy storage units is below a short circuit current limit, wherein the short circuit current limit is less than a sum of short circuit currents of said at least three battery energy storage units of the battery energy storage system and wherein the short circuit current limit is based on a peak current withstand level of the battery energy storage system and/or of a component connected thereto, and
such that a sum of discharge powers or a sum of charge powers of the selected plurality of battery energy storage units equals to or exceeds a power limit, wherein the power limit corresponds to a power of the battery energy storage system and/or the component connected thereto, and
such that states of charge of the selected plurality of battery energy storage units are within a determined range, which indicates a range of variation of the states of charge of the selected plurality at battery energy storage units;
b) controlling the switching arrangement to couple only the selected plurality of battery energy storage units to the DC power connection; and
c) after step b), starting a charging or discharging of the selected plurality of battery energy storage units coupled to the DC power connection.