Hybrid Energy Storage Control for Peak Power Without Oversizing
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Solution Overview
Problem
The design of hybrid energy storage systems requires a large and costly high-performance storage component to meet maximum power demands, leading to inefficient use and increased spatial requirements.
Innovation Solution
A method for controlling energy exchange between high-energy and high-performance storage devices based on a predicted state of charge profile, allowing for bidirectional energy distribution and internal power transfer to optimize the charge level of each component, reducing the need for excessive high-performance storage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the high-performance storage device is designed to meet the maximum power demand, then the system can provide sufficient power during peak demand, but the high-performance storage device becomes oversized and costly
Solution Approach 1:
The control device performs preliminary actions by predicting future state of charge profiles and proactively transferring energy between storage devices before peak demand occurs. This allows the high-performance device to be recharged from the high-energy device during low-demand periods, so it is fully charged and ready to meet peak power demands without requiring excessive capacity.
Solution Approach 2:
The system dynamically adjusts the charge levels of both storage devices based on predicted future states. The control device continuously monitors and modifies the state of charge profiles, enabling the high-performance device to operate at optimal charge levels rather than maintaining constant high capacity, thus reducing the required device size while maintaining power provision capability.
2Power
If the high-performance storage device is oversized to meet maximum power demands, then power sufficiency is ensured, but spatial requirements and costs increase
Solution Approach 1:
Energy is transferred preliminarily from the high-energy storage device to the high-performance storage device before peak power demands occur. This proactive energy redistribution ensures the high-performance device has sufficient charge to meet power demands without requiring physical oversizing, thereby reducing the spatial footprint of the storage system.
3Duration of action of moving object
If the high-performance storage device is designed with large capacity, then it can provide power for extended periods, but the system becomes less cost-effective
Solution Approach 1:
The system performs preliminary charging of the high-performance device during periods when the high-energy device has excess capacity. This allows the high-performance device to provide power for extended periods during high-demand phases without requiring a permanently large capacity design, reducing overall system cost while maintaining extended operational capability.
Solution Approach 2:
The control device changes the operational parameters by dynamically adjusting the state of charge profiles of both devices. Instead of maintaining fixed high capacity, the system varies charge levels based on predicted demand, allowing the high-performance device to operate efficiently at lower average capacity while still providing extended power provision when needed.
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 approach enables a smaller, more cost-effective design of the high-performance storage device, as its capacity only needs to be sized for the highest discharge or charge stage, optimizing performance and reducing spatial and economic burdens.
Implementation Method 1
an exchange of energy between the two partial storage devices is possible, i.e., energy can be transferred from the high-performance storage device to the high-energy storage device and vice versa
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a method for controlling an energy storage device (1) comprising at least a first partial storage device (2) in the form of at least one high-energy storage device (3) and at least a second partial storage device (5) in the form of at least one high-performance storage device (6), wherein the two partial storage devices (2, 5) are connected to each other for bidirectional energy exchange, and a control device (11) controlling the operation of the energy storage device (1), wherein energy is discharged when power is required externally and energy is charged when power is supplied externally, wherein the energy exchange is controlled depending on a previously known or predicted state-of-charge profile that describes future discharge and charge processes of the energy storage device (1) over time.