Power Distribution in Energy Storage Systems
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Solution Overview
Problem
Energy storage systems face challenges in maintaining uniform state of charge (SoC) across batteries, leading to inefficiencies in power distribution and overall system performance, especially when dealing with fluctuating renewable energy sources.
Innovation Solution
A method and apparatus for electric power distribution in energy storage systems that computes a total power amount based on user output target and deviation, determines power distribution among power conditioning systems (PCSs) using weighting factors considering charge capacity, SoC, and discharge efficiency, and implements real-time output distribution computation by a power management system (PMS) to maintain uniform SoC across batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is distributed without considering individual battery states, then power distribution is simple, but state of charge uniformity deteriorates
Solution Approach 1:
The patent applies local quality by assigning different weight values to each battery based on its individual state of charge, capacity, and efficiency characteristics. Instead of uniform power distribution, each battery receives customized weight coefficients that reflect its specific operational state, thereby maintaining simplicity while achieving uniformity.
Solution Approach 2:
The system dynamically adjusts the weight parameters for each battery based on real-time state of charge, capacity, and efficiency measurements. These parameter changes enable the power distribution to adapt to varying battery conditions, resolving the contradiction between simple distribution and uniform state maintenance.
2Stability of the object's composition
If real-time state monitoring and weight calculation are implemented, then state of charge uniformity is improved, but system complexity increases
Solution Approach 1:
The power management system automatically monitors battery states, calculates weight values, and adjusts power distribution without external intervention. This self-service mechanism handles the complexity internally while presenting a simple interface, resolving the contradiction between uniformity achievement and system complexity.
Solution Approach 2:
The system implements continuous feedback by monitoring battery state of charge, capacity, and efficiency, then using this information to recalculate weight values and adjust power distribution. This closed-loop feedback mechanism maintains uniformity while managing complexity through automated control algorithms.
3Productivity
If uniform state of charge is maintained across all batteries, then battery use efficiency is improved, but power distribution control complexity increases
Solution Approach 1:
The patent implements dynamic weight adjustment where the distribution weights are not fixed but continuously updated based on battery performance metrics. This dynamic approach optimizes battery efficiency by adapting to changing conditions while managing control complexity through systematic algorithms.
Solution Approach 2:
By changing the weight parameters dynamically based on state of charge, capacity, and efficiency measurements, the system optimizes battery utilization. The parameter changes enable efficient power distribution while the systematic approach to parameter management keeps control complexity manageable.
Data Source
AI summary
Disclosed is an method and apparatus for electric power distribution in an energy storage system. The electric power distribution method of the energy storage system (ESS) includes computing a total power amount on the basis of a received user output target power amount and a deviation amount, determining a power distribution power conditioning system (PCS) to which the total power amount is distributed out of the PCSs included in the ESS, and distributing the total power amount on the basis of the power distribution PCS. The deviation amount is a difference between an existing user output target power amount used in an existing power distribution process and an existing total power amount.