Energy Storage Efficiency Factor Update via Correlation Analysis
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Solution Overview
Problem
Conventional energy storage systems (ESS) fail to accurately update charging/discharging efficiency factors in response to changing operating environments, leading to increased errors between reference and actual power values due to battery deterioration and environmental changes.
Innovation Solution
An apparatus that calculates correlation coefficients between input charging/discharging reference values and measured power values, selects corresponding power values based on these coefficients, and updates efficiency factors for each power range, enabling real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If initially set charging/discharging efficiency factors are used without updating, then device complexity is reduced, but manufacturing precision deteriorates due to increased error between reference and actual power values
Solution Approach 1:
The patent implements dynamic updating of efficiency factors by transitioning from static initial values to continuously updated values based on measured data. The control unit periodically receives measured charging/discharging power values, calculates updated efficiency factors, and applies them to correct reference values, thereby adapting to battery deterioration and environmental changes while maintaining acceptable system complexity
Solution Approach 2:
The patent establishes a feedback loop where measured charging/discharging power values are fed back to the control unit, which then recalculates efficiency factors and uses them to correct reference values. This closed-loop feedback mechanism continuously improves accuracy by comparing actual performance with expected performance and adjusting parameters accordingly
2Manufacturing precision
If efficiency factors are updated in real-time using measured data, then charging/discharging power accuracy is improved, but device complexity increases due to additional calculation and data processing requirements
Solution Approach 1:
The patent changes the parameter of efficiency factors from fixed initial values to dynamically updated values. The control unit modifies these parameters based on measured data, calculating new efficiency factors that reflect current battery conditions and environmental factors, thereby improving accuracy without requiring fundamental system redesign
Solution Approach 2:
The patent performs preliminary calculations of updated efficiency factors before they are needed for correcting reference values. The control unit continuously calculates updated efficiency factors based on measured data, so that when reference values need correction, the updated factors are already available, reducing real-time computational burden
Data Source
AI summary
Disclosed herein is an apparatus for updating charging/discharging efficiency factors of an energy storage system. The apparatus includes: a correlation coefficient calculate unit configured to calculate correlation coefficients between n charging/discharging reference values input to the energy storage system during a predetermined update cycle and (n+k) charging/discharging power values measured in the energy storage system after the predetermined update cycle has started, where n and k are natural numbers; a selection unit configured to select n charging/discharging power values corresponding to the n charging/discharging reference values among the (n+k) charging/discharging power values based on correlation coefficients; and an update unit configured to update the charging/discharging efficiency factors set for each power range with n charging/discharging efficiency factors calculated by using the n charging/discharging reference values and the selected n charging/discharging power values.