Dual-Storage Central Accumulator for Grid Frequency Stabilization
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Solution Overview
Problem
Existing central memory systems for electrical energy transmission networks face challenges in stabilizing network frequency due to deviations in energy supply and demand, requiring efficient control power provision, which is limited by the availability and capacity of storage units.
Innovation Solution
A dual-storage system is introduced, comprising a self-controlled high-dynamic storage section for primary control reserve and an externally controllable low-dynamic storage section, allowing for charge transfer between them to approximate the self-controlled storage's charge state to a target, enabling remote-controlled energy exchange with the transmission network to balance load and reduce the need for control power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single storage section is used for control power provision, then the system structure is simple, but the ability to quickly adjust the operating point and provide control reserve is limited
Solution Approach 1:
The storage system is divided into two distinct storage sections: a self-controlled storage section for rapid control power provision and an externally controllable storage section for flexible operating point adjustment. This segmentation allows each section to specialize in specific functions, improving overall control reserve capability while maintaining manageable complexity through clear functional separation.
2Productivity
If the self-controlled storage section operates at fixed charge state, then the system operation is simple, but the efficiency and availability of control power provision is reduced
Solution Approach 1:
A feedback control mechanism is implemented where the control unit continuously monitors the charge state of the self-controlled storage section and automatically initiates charge transfer from the externally controllable storage section when the charge state deviates from the optimal range. This feedback loop ensures high control power availability while automating the complexity of charge state management.
Solution Approach 2:
The self-controlled storage section is designed to automatically receive charge transfer from the externally controllable storage section when needed, without requiring manual intervention. The system self-regulates the charge state by detecting deviations and triggering appropriate charge transfer operations, enabling the storage section to maintain optimal operating conditions autonomously.
3Productivity
If commercial transactions are used to adjust storage operating point, then external flexibility is achieved, but cost and time efficiency are reduced
Solution Approach 1:
The system merges the self-controlled storage section and externally controllable storage section into a unified energy management system. This integration allows internal charge transfer between sections to replace external commercial transactions for operating point adjustments, eliminating transaction costs and time delays while maintaining the flexibility to adjust the operating point as needed.
4Power
If only lithium-ion battery systems are used, then high power density is achieved, but adaptability to different control reserve requirements is limited
Solution Approach 1:
The externally controllable storage section serves multiple functions: it acts as a supplemental energy source for control power provision, provides flexible operating point adjustment capability, and enables charge transfer to maintain optimal charge states. This multi-functionality increases adaptability to different control reserve requirements while the high-power lithium-ion batteries maintain power density requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This dual-storage approach enhances the availability and efficiency of control reserve provision by allowing quick and cost-effective adjustments in the self-controlled storage's operating point, reducing the need for commercial transactions and stabilizing the grid frequency by actively balancing energy loads.
Implementation Method 1
a self-controlled storage section (23) for the provision of control power and, on the other hand, a storage section (24) that can be controlled externally, with a charge transfer (X) taking place between or during the processes of providing control power between the self-controlled storage section (23) and the externally controllable storage section (24)
Data Source
Figure 1
AI summary
The invention relates to an electrical central accumulator (10) which comprises a plurality of energy accumulator units (22) and an energy flow control (20) and which is connected to an electrical transmission grid (11). In order to provide a control reserve, the energy flow control (20) is designed to supply a control reserve energy flow (P) to the electrical transmission grid (11). The central accumulator (10) has a self-controlled accumulator section (23) and an externally controllable accumulator section (24). The self-controlled accumulator section (23) provides the control reserve and has a first accumulator capacity. The externally controllable accumulator section (24) has an additional accumulator capacity. Between or during the procedures for providing a control reserve, a charge transfer (X) is carried out between the self-controlled accumulator section (23) and the externally controllable accumulator section (24), in order to bring an actual state of charge of the self-controlled accumulator section (23) approximately up to a target state of charge.