Battery Charge Allocation Using SOH-Based Power Distribution
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Solution Overview
Problem
Existing charge/discharge control methods for power storage systems do not consider the state of health (SOH) of storage batteries, leading to variations in SOH among batteries, which can affect their performance and lifespan.
Innovation Solution
A charge/discharge control device that calculates second charge/discharge electric power command values for each battery based on its SOH, adjusting power distribution to balance SOH and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charge/discharge command values are calculated based on SOC to balance SOC among storage batteries, then SOC balance is improved, but variations in state of health among storage batteries increase
Solution Approach 1:
The patent changes the control parameter from SOC (state of charge) to SOH (state of health) for calculating charge/discharge command values. By using SOH as the basis for distributing charge/discharge commands, the system balances the health status of storage batteries rather than just their charge levels, thereby reducing SOH variations while maintaining operational efficiency
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors SOH values of individual storage batteries and uses this information to dynamically adjust charge/discharge command values. This feedback loop ensures that batteries with lower SOH receive reduced charge/discharge commands, preventing further degradation and balancing the overall health status across the storage system
2Ease of operation
If uniform charge/discharge electric power is assigned to all storage batteries, then system operation is simplified, but variations in state of health increase due to ignoring battery deterioration differences
Solution Approach 1:
The patent applies local quality by assigning different charge/discharge command values to individual storage batteries based on their specific SOH conditions. Instead of uniform treatment, each battery receives customized commands proportional to its health status, ensuring that deteriorated batteries are protected while maintaining overall system functionality
Solution Approach 2:
The patent introduces dynamic adjustment of charge/discharge commands based on real-time SOH monitoring. The control strategy transitions from static uniform allocation to dynamic differentiated allocation, where command values are continuously adapted according to the changing health status of each battery, optimizing both reliability and operational efficiency
Data Source
AI summary
This charge/discharge control device is used in a power storage system having a plurality of storage batteries, the charge/discharge control device comprising: a storage battery information acquisition unit that acquires storage battery information including a degree of health of each of the plurality of storage batteries; an overall command value acquisition unit that acquires a first charge/discharge electric power command value indicating a charge/discharge electric power requested for the power storage system overall; and a command value calculation unit that, on the basis of the degree of health, calculates a second charge/discharge electric power command value indicating a charge/discharge electric power allocated to each of the storage batteries from within the first charge/discharge electric power command value.