Dynamic State of Charge Limits for Vehicle Power Exchange
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Solution Overview
Problem
Existing electric power management systems for electrified vehicles do not effectively enhance contribution to virtual power plants by controlling the state of charge of batteries within a target range, limiting the exchange of electric power with counterparty systems.
Innovation Solution
An electric power management system that dynamically adjusts the upper and lower limits of the state of charge of electric power storage devices based on the degree of charge-discharge, allowing for increased exchange of electric power with counterparty systems by optimizing charging and discharging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the state of charge is controlled within a fixed target range, then battery reliability is maintained, but the contribution to virtual power plant and electric power exchange is limited
Solution Approach 1:
The patent applies dynamics by making the upper and lower limit values of the state of charge dynamic rather than fixed. The control device changes these limit values based on the degree of charge-discharge, allowing the battery management system to adapt to varying operational conditions and maximize contribution to the virtual power plant while maintaining battery reliability through context-aware adjustments.
Solution Approach 2:
The patent implements parameter changes by adjusting the state of charge limit values (upper and lower bounds) based on the degree of charge-discharge. This dynamic parameter adjustment enables the system to optimize electric power exchange with the counterparty system, transforming the fixed parameter approach into a flexible one that responds to real-time battery conditions and grid requirements.
2Productivity
If the degree of charge-discharge is increased to enhance virtual power plant contribution, then electric power exchange is improved, but battery deterioration accelerates
Solution Approach 1:
The patent implements feedback by continuously monitoring the degree of charge-discharge and using this information to adjust the state of charge limit values. The control device receives feedback on battery operational status and dynamically modifies the upper and lower limit values to optimize electric power exchange while preventing excessive charge-discharge cycles that would accelerate battery deterioration.
Solution Approach 2:
The system uses dynamics to adapt the state of charge limits based on real-time battery conditions. By making the limit values dynamic rather than static, the system can respond to changing battery health status and operational demands, allowing increased electric power exchange when battery conditions permit while automatically reducing exchange intensity when deterioration risks arise.
3Device complexity
If fixed state of charge limits are used, then system complexity is reduced, but adaptability to different operational conditions deteriorates
Solution Approach 1:
The patent applies self-service by enabling the battery management system to automatically adjust its own operational parameters (state of charge limits) based on monitored battery conditions. The control device autonomously changes the upper and lower limit values according to the degree of charge-discharge without requiring external intervention, thereby improving adaptability while maintaining relatively simple system architecture.
Data Source
AI summary
An electric power management system is a system that performs an exchange of electric power with an electric power system of an electric power company that is a counterparty of the exchange of the electric power, and includes a plurality of the vehicles, each including a battery, and a server that manages an exchange of the electric power between the battery of each of the vehicles and the electric power system. The server limits the exchange of the electric power between the electric power system and the battery by an upper limit value or a lower limit value of a state of charge of the battery, and changes the upper limit value or the lower limit value in accordance with a degree of charge-discharge of the battery.