Battery Pack Power Assignment for Voltage-SOC Balancing
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Solution Overview
Problem
Existing energy storage systems face challenges in efficiently managing heterogeneous battery packs, particularly in balancing discharge and charge based on voltage and state of charge, which affects the flexibility and reliability of renewable energy sources like solar and wind power.
Innovation Solution
A controller system that balances the discharge or charge of heterogeneous battery packs by assigning weighting factors based on voltage and state of charge, using processors to calculate power distribution parameters and voltage-charge combination factors, allowing for dynamic control and efficient utilization of battery packs without pre-selection or dismantling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heterogeneous battery packs are used to increase system capacity and flexibility, then the energy storage system can accommodate more battery packs with different characteristics, but it becomes difficult to balance discharge and charge based on voltage and state of charge
Solution Approach 1:
The controller applies individualized control strategies to each battery pack based on its specific characteristics. By calculating unique voltage-charge combination factors for each pack using its voltage and state of charge, the system tailors the power assignment to match each pack's local conditions, enabling effective balancing of heterogeneous packs with different states
Solution Approach 2:
The system dynamically adjusts the power assignment parameters based on real-time voltage and state of charge measurements. By changing the weighting factors in the voltage-charge combination formula according to each pack's current state, the controller adapts the balancing strategy to accommodate varying battery conditions throughout charging and discharging cycles
2Device complexity
If traditional balancing methods are used, then the control algorithm is simpler, but the system cannot effectively manage battery packs with different voltage and state of charge characteristics
Solution Approach 1:
The voltage-charge combination factor formula serves as a universal control mechanism that works for all battery packs regardless of their heterogeneity. This single formula integrates both voltage and state of charge considerations and can be applied uniformly across diverse battery packs, achieving adaptability without requiring entirely separate control algorithms for different pack types
Solution Approach 2:
The controller pre-calculates the voltage-charge combination factors for each battery pack based on their current voltage and state of charge before executing power assignment. This preliminary calculation prepares the individualized control parameters in advance, enabling the system to effectively manage heterogeneous packs while maintaining a relatively simple real-time control structure
Data Source
AI summary
A controller, a system including such a controller, and a method for controlling or managing discharge or charge of a plurality of battery packs are provided. The controller includes one or more processor and at least one tangible, non-transitory machine readable medium encoded with one or more programs configured to perform steps to determine a respective power discharge or charge for each battery packs based on characteristic data of each battery pack, a power demand, and the first weighting factor (a) and the second weighting factor (b) for power assignment based on voltage and state of charge of each battery pack. The controller provides signals with instructions to the plurality of battery packs and/or the one or more power converters for discharging power from or charging power to the plurality of battery packs.