US 11,888,334 B2
Methods and systems for charging or discharging energy storage systems
Kevin J. Sergott, Dunlap, IL (US); and Dachuan Yu, Dunlap, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Oct. 27, 2020, as Appl. No. 17/081,077.
Prior Publication US 2022/0131388 A1, Apr. 28, 2022
Int. Cl. H02J 7/00 (2006.01); H02J 3/06 (2006.01); H02J 15/00 (2006.01); H01M 10/44 (2006.01); H02J 3/28 (2006.01); H02J 13/00 (2006.01); H02J 3/14 (2006.01)
CPC H02J 7/0013 (2013.01) [H02J 3/06 (2013.01); H01M 10/441 (2013.01); H02J 3/14 (2013.01); H02J 3/28 (2013.01); H02J 7/0068 (2013.01); H02J 13/00004 (2020.01); H02J 15/00 (2013.01); H02J 2310/10 (2020.01); H02J 2310/60 (2020.01); Y02B 70/3225 (2013.01); Y02P 80/14 (2015.11); Y04S 20/222 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of allocating power across a microgrid having a plurality of energy storage systems with different power and/or energy capacities, and different states of charge; the method comprising:
allocating a total charge request and/or a total discharge request across the plurality of energy storage systems;
limiting charge and/or discharge of the plurality of energy storage systems to a respective submaximal value for each of the plurality of energy storage systems, wherein the submaximal value for each of the plurality of energy storage systems is a function of the total charge and/or discharge limit of the respective one of the plurality of energy storage systems and a convergence factor; and
allocating a remainder of the total charge request and/or a remainder of the total discharge request to a subset of the plurality of energy storage systems, the subset comprising one or more of the plurality of energy storage systems that have not reached their respective submaximal value,
wherein the total charge and/or the total discharge request corresponds to a sum of the charge and/or discharge limits, respectively, of each of the plurality of energy storage systems,
wherein the limiting to the submaximal values occurs for a limited window,
wherein the limited window ends when all of the energy storage units have reached their said respective submaximal values, and
wherein, after the limiting window, the charge and/or discharge is increased linearly to a charge limit and/or discharge limit.