Battery Module Selection Control for DC/DC Conversion Efficiency
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Solution Overview
Problem
In storage battery systems with modules having different power conversion efficiencies, the overall power conversion efficiency is decreased, especially when the requested electric power is small.
Innovation Solution
A device and method that calculates state information and power conversion efficiencies of each storage battery module, selecting and controlling the use of modules to optimize charge/discharge power based on these efficiencies, allowing for the selection or deactivation of modules to enhance overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If all storage battery modules are used in parallel, then the total power output is increased, but the overall power conversion efficiency is decreased due to modules with different efficiencies
Solution Approach 1:
The storage battery system is divided into multiple storage battery modules, each with its own DC/DC converter. The control device can independently control each module's charge/discharge operation, allowing selective activation of modules based on their individual power conversion efficiencies to optimize overall system performance
Solution Approach 2:
The control device dynamically adjusts the operation state of each storage battery module based on real-time power conversion efficiency data. Modules can be switched on or off dynamically depending on the requested electric power level and individual module efficiencies, making the system adaptable to varying operating conditions
2Adaptability or versatility
If storage battery modules with different power conversion efficiencies are used, then the system adaptability is improved, but the overall power conversion efficiency is decreased especially when requested electric power is small
Solution Approach 1:
Each storage battery module is treated as an independent unit with its own power conversion efficiency characteristics. The control device applies different control strategies to different modules based on their local efficiency properties, selecting modules with higher efficiency for operation when requested power is small
3Adaptability or versatility
If the number of DC/DC converters is increased to handle multiple modules, then the power distribution flexibility is improved, but the device complexity is increased
Solution Approach 1:
Each DC/DC converter is designed as a universal module that can independently manage charge/discharge operations for its associated storage battery module. This standardized multi-functional design allows the system to scale while maintaining manageable complexity through modular architecture
Data Source
AI summary
A device for controlling a storage battery system is provided. The device includes: a state information calculator configured to calculate state information on each of batteries of a plurality of storage battery modules; a conversion efficiency characteristics calculator configured to calculate a power conversion efficiency of each of DC/DC converters of the plurality of storage battery modules; and a storage battery module selector configured to select one or a plurality of storage battery modules to be used while the storage battery system is charged or discharged and to determine a charge power or a discharge power of each of the selected storage battery modules, based on the state information of the batteries and the power conversion efficiencies of the DC/DC converters.