Distributed Energy Storage Activation for 10-Second Grid Balancing
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Solution Overview
Problem
Managing distributed energy storage (DES) arrangements to efficiently participate in electric grid frequency balancing is challenging due to the need for fast activation of thousands of nodes with varying reliability, which can cause synchronization issues and exceed the 10-second response time required in markets like the Nordic aFRR.
Innovation Solution
A centralized coordinator system manages DES nodes by sending parallel activation requests, detecting confirmation or error situations, aggregating capacity, and using blacklists and grey lists to handle faulty nodes, with mechanisms like SNMP and separate communication threads to ensure timely activation and deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If activation requests are sent sequentially to thousands of DES nodes, then system complexity is reduced, but response time exceeds the 10-second requirement for grid balancing
Solution Approach 1:
The system segments the activation process into parallel communication threads, each handling a subset of nodes independently. This allows simultaneous activation requests to be sent to multiple nodes without creating a single point of failure or bottleneck, achieving fast response times while maintaining manageable system complexity through modular organization
Solution Approach 2:
The system performs preliminary actions by pre-configuring communication threads and establishing connection pools before activation is needed. This preparation ensures that when grid balancing is required, the system can immediately send parallel activation requests without the overhead of establishing connections during the critical response period
2Productivity
If all selected nodes are activated simultaneously, then productivity is improved, but reliability decreases due to varying node reliability and synchronization issues
Solution Approach 1:
The system activates more nodes than the minimum required capacity, selecting nodes with excess margin. This allows the system to tolerate some node failures while still meeting the grid balancing requirement, achieving high productivity through parallel activation while maintaining reliability by having redundant capacity
Solution Approach 2:
The system implements feedback mechanisms where activation confirmations and error messages from nodes are collected and processed. This feedback allows the system to monitor actual activation status and adjust accordingly, ensuring reliable grid balancing even when some nodes fail to respond as expected
3Reliability
If error handling is implemented for faulty nodes, then reliability is improved, but device complexity increases due to blacklist and grey list management
Solution Approach 1:
The system performs preliminary classification of nodes into blacklist and grey list categories based on their activation history and reliability. This pre-categorization allows the system to automatically exclude known problematic nodes from future activation attempts while maintaining a manageable level of complexity through structured classification
Data Source
AI summary
A computer implemented method for managing a distributed energy storage, DES, arrangement, wherein the DES arrangement comprises a pool of nodes (121-125). The method is performed by detecting a balancing need for frequency balancing of electric grid; selecting a plurality of nodes of the DES arrangement for fulfilling a capacity requirement associated with the balancing need; sending activation requests to the selected nodes, wherein sending of the activation requests is performed in parallel; detecting an activation confirmation situation or an error situation for the selected nodes; aggregating capacity of the nodes for which an activation confirmation situation is detected; and reserving the aggregated capacity for the balancing need.