Fuzzy Logic Power Coordination for Hybrid Energy Storage
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Solution Overview
Problem
Hybrid energy storage systems face inefficiencies due to the need for oversized single-type energy storage systems to address varying power and energy demands, leading to suboptimal utilization and potential damage to components.
Innovation Solution
A power management system utilizing fuzzy logic controllers to coordinate power distribution between ultracapacitors and batteries, considering state of charge and power demand, allowing for real-time adjustments and optimal operation within operational limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single-type energy storage system (battery or ultra-capacitor) is chosen to meet high power demand, then the system can respond to high power transients, but the energy storage device must be oversized leading to increased cost and suboptimal utilization
Solution Approach 1:
The energy storage system is segmented into two distinct components: a battery subsystem for energy storage and an ultra-capacitor subsystem for power delivery. Each component is sized for its specific function, allowing the battery to be smaller than if it had to handle all power demands alone, while the ultra-capacitor handles transient power requirements independently.
Solution Approach 2:
The patent combines two different energy storage technologies (battery and ultra-capacitor) into a hybrid system where they work together through a power management controller. The battery provides sustained energy while the ultra-capacitor provides rapid power response, achieving both high power capability and appropriate sizing without oversizing either component.
2Power
If a single-type energy storage system (ultra-capacitor) is chosen to meet high power demand, then the system can supply sustainable power support, but the energy storage device must be oversized leading to increased cost
Solution Approach 1:
The system segments power delivery functions between two components: the ultra-capacitor handles rapid transient power demands while the battery provides sustained energy supply. This segmentation allows the ultra-capacitor to be smaller than a standalone system would require, since it only needs to cover transient gaps rather than all power demands continuously.
Solution Approach 2:
By merging ultra-capacitor and battery technologies, the system leverages the ultra-capacitor's high power density for transient response and the battery's high energy density for sustained operation. The power management controller coordinates their operation, allowing appropriate sizing of each component for its specific role rather than oversizing one component to handle all functions.
3Quantity of substance
If a single-type energy storage system (battery) is chosen to meet energy density requirements, then the system can provide sustainable power support, but it cannot respond quickly to high power transients
Solution Approach 1:
The system segments the response time requirements into two components: the battery handles slow, sustained energy supply while the ultra-capacitor handles fast transient responses. This temporal segmentation allows each component to be optimized for its specific time scale, with the battery providing high energy density for long-duration support and the ultra-capacitor providing rapid response for short-duration transients.
Solution Approach 2:
The hybrid system merges two energy storage technologies with different response characteristics. The battery provides high energy density for sustained operation, while the ultra-capacitor provides fast response capability. The power management controller coordinates their operation, allowing the system to achieve both high energy density and fast response capability that neither component could provide alone.
4Reliability
If oversized energy storage devices are used to cover all scenarios, then the system can meet all power and energy demands, but the utilization of the energy storage components becomes suboptimal and may cause damage
Solution Approach 1:
The system segments the operational requirements into distinct functional zones: the ultra-capacitor operates in high-power transient zones while the battery operates in sustained energy zones. The power management controller monitors system state and directs power flow accordingly, ensuring each component operates within its optimal range and avoiding suboptimal utilization or damaging conditions.
Solution Approach 2:
The power management controller dynamically adjusts power distribution between the battery and ultra-capacitor based on real-time system conditions, including state of charge levels and power demand characteristics. This dynamic coordination ensures optimal utilization of each component under varying operating conditions, preventing both suboptimal operation and damaging stress conditions.
Data Source
AI summary
A method of managing power between the multiple components of a hybrid electrical energy storage system (HESS) that includes providing at least two power storage elements, and at least one renewable power source. The method further includes managing the power flow among the at least two power storage elements with a fuzzy logic controller. The fuzzy logic controller uses a hardware processor that is configured to increase or decrease current to each of the at least two power storage elements using a fuzzy rule base that is dependent upon at least one of a state of charge for each of the at least two power storage elements, and a requested power demand of the hybrid electrical storage system.