Management of a distributed energy storage, DES, arrangement
Managing a distributed energy storage, DES, arrangement to participate in electric grid balancing, wherein the DES arrangement comprises a pool of nodes. The method is performed by detecting ( 301 ) a balancing need for balancing the electric grid either in up direction or down direction; selecting ( 302 ) nodes for the balancing need; identifying ( 303 ) preferred balancing activity for a plurality of the selected nodes, wherein the preferred balancing activity is node specific, wherein first nodes, if any, have a preferred balancing activity in the same direction with the detected balancing need, and second nodes, if any, have a preferred balancing activity that is opposite to the detected balancing need; starting activation ( 304 ) of a balancing activity according to the balancing need for the first nodes, if any, upon detecting the balancing need; and delaying activation ( 305 ) of the balancing activity according to the balancing need for the second nodes, if any.
1. A computer implemented method for managing a distributed energy storage, DES, arrangement to participate in electric grid balancing, wherein the DES arrangement comprises a pool of nodes; the method comprising
detecting a balancing need for balancing the electric grid either in up direction or down direction;
selecting nodes for the balancing need, wherein the selection is based on randomly choosing nodes, using a logic in choosing the nodes and/or selecting the nodes based on properties of battery systems of the nodes;
identifying preferred balancing activity for a plurality of the selected nodes, wherein the preferred balancing activity is node specific, wherein first nodes have a preferred balancing activity in the same direction with the detected balancing need, and second nodes have a preferred balancing activity that is opposite to the detected balancing need;
starting activation of a balancing activity according to the balancing need for the first nodes upon detecting the balancing need; and
delaying activation of the balancing activity according to the balancing need for the second nodes wherein said delaying takes into account a required activation time of the detected balancing need.
2. The method of claim 1 , wherein the node specific preferred balancing activity is selected from up direction, down direction, and no specific preference.
3. The method of claim 1 , wherein the detected balancing need is associated with a required activation time and the activation of the balancing activity of at least some of the second nodes is delayed until the required activation time.
4. The method of claim 1 , further comprising identifying the preferred balancing activity in real time.
5. The method of claim 1 , further comprising identifying the preferred balancing activity based on predetermined preference information and periodically updating the predetermined preference information.
6. The method of claim 1 , further comprising continuously monitoring changes in the balancing need and accordingly adjusting the activation of the balancing activity of the selected nodes.
7. The method of claim 1 , wherein selecting nodes for the balancing need comprises selecting primarily nodes that have a preferred balancing activity in the same direction with the detected balancing need.
8. The method of claim 1 , wherein
if the balancing need is related to bringing energy to batteries of the nodes, nodes that are below a target state of charge, SoC, are identified as the first nodes, and nodes above the target SoC are identified as the second nodes; and
if the balancing need is related to consuming energy from the batteries of the nodes, nodes that are above the target SoC are identified as the first nodes, and nodes below the target SoC are identified as the second nodes.
9. The method of claim 1 , further comprising starting activation of a predefined minimum capacity within a minimum response limit.
10. The method of claim 1 , further comprising performing the activation of the nodes sequentially so that number of activated nodes gradually increases.
11. The method of claim 1 , further comprising adjusting activation power levels of the selected nodes within allowable power level limits, either on individual node level or on an aggregated activation power level of the DES arrangement.
12. The method of claim 1 , wherein detecting a balancing need for balancing the electric grid comprises detecting a frequency balancing need.
13. An apparatus comprising a processor and a memory including computer program code, wherein the memory and the computer program code are configured to, with the processor, cause the apparatus to perform the method of claim 1 .
14. A non-transitory computer readable medium having stored thereon a computer program comprising computer executable program code which when executed in an apparatus comprising a processor and a memory including computer program code, wherein the memory and the computer program code are configured to, with the processor, cause the apparatus to perform the method of claim 1 .