Decentralized Energy Storage System for Local and Non-Local Grid Control
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Solution Overview
Problem
Current energy storage systems are not effectively designed to simultaneously improve local power quality and security of supply for both local and non-local power grids, as they are either optimized for one purpose and lack site-specific functionality, and existing decentralized systems are not interconnected to function both locally and non-locally.
Innovation Solution
An energy storage system comprising local energy storage units connected to both local and non-local power grids, with local control units managing local tasks and a central control unit managing non-local tasks, enabling flexible energy absorption and feed-in to address grid conditions and support renewable energy integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If centralized energy storage systems (pumped storage plants) are used for grid stabilization, then large capacity and control energy provision for non-local power grids is achieved, but the system is not suitable for stabilizing local power grids with small power demand
Solution Approach 1:
The energy storage system is divided into multiple decentralized local energy storage systems, each capable of independent operation for local grid stabilization. These segmented units can collectively provide significant capacity for non-local grid support while individually adapting to local grid requirements.
Solution Approach 2:
The system operates on two levels simultaneously: locally for individual grid stabilization and non-locally for centralized control energy provision. This multi-dimensional operation allows the same infrastructure to serve both small local grids and large non-local power systems.
2Adaptability or versatility
If decentralized energy storage systems are optimized for local stabilization, then local power quality is improved, but the systems cannot effectively support non-local power grids
Solution Approach 1:
Multiple decentralized energy storage systems are merged into a coordinated network under centralized control. This combination allows individual systems to maintain their local optimization while collectively providing sufficient capacity for non-local grid support through pooled resources.
Solution Approach 2:
Each decentralized energy storage system is designed with universal functionality to perform both local stabilization tasks and non-local control energy provision. The systems can dynamically switch between or simultaneously execute both functions based on grid needs.
3Quantity of substance
If battery storage systems are designed for large capacity, then they can provide control energy for non-local power grids, but they are not well suited for applications with multiple load cycles per day due to aging relationships
Solution Approach 1:
Instead of relying on a single large battery system that would degrade from frequent cycling, the solution uses multiple smaller decentralized energy storage systems. These can be selectively cycled based on local needs, distributing the wear and extending overall system life while maintaining required capacity.
Solution Approach 2:
The system changes the operational parameters of battery storage by controlling which specific units are cycled at any given time. This selective operation reduces the cumulative load cycles on individual batteries, extending their operational life while maintaining the aggregate capacity needed for non-local grid support.
Data Source
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AI summary
The local control units (41-1-43-1) controls energy storage installations (41-43) for stationary control and system tasks (LRS) for local power grids (61-64). A central control unit (2) is connected to local control units by communication network (3), for controlling the intake of energy from local energy storage installations and the energy output to non-local power grid (5). The central control unit provides all components of local storage capacities and local output of energy storage installations for non-stationary control and system tasks in non-local power grid. An independent claim is included for a method for operating energy storage system.