Battery SOC Management via Periodic Voltage Reset
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Solution Overview
Problem
In storage battery systems with multiple power conditioning systems, accurately calculating the State of Charge (SOC) is challenging due to cumulative errors from detection accuracy and charge/discharge losses, especially when continuous charging and discharging occurs without breaks.
Innovation Solution
A charge/discharge management device is implemented, which includes an operation time SOC calculation unit, stop condition determination unit, stop time SOC estimation unit, initial SOC resetting unit, and charge/discharge command unit to periodically reset and recalibrate the SOC, ensuring accurate calculation by stopping charge/discharge operations at fixed intervals and using voltage values to estimate the SOC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If continuous charge/discharge operation is performed to stabilize power supply, then power supply stability is improved, but SOC calculation accuracy deteriorates due to cumulative errors
Solution Approach 1:
The patent implements periodic charge/discharge stop operations at predetermined intervals to reset SOC calculation errors. The control unit stops charge/discharge operations periodically, waits for a predetermined period, then resumes operations. This periodic interruption allows the SOC calculation to be reset, preventing cumulative errors from deteriorating accuracy while maintaining overall power supply stability through the storage battery system.
2Measurement precision
If charge/discharge operations are stopped frequently to recalculate SOC, then SOC calculation accuracy is improved, but power supply stability deteriorates
Solution Approach 1:
The control unit stops charge/discharge operations only at predetermined intervals rather than frequently, striking a balance between SOC accuracy and power supply stability. By controlling the stop frequency to occur only at predetermined intervals and resuming operations after a predetermined waiting period, the system maintains power supply stability while still achieving periodic SOC calculation resets.
Solution Approach 2:
The system performs preliminary SOC calculation corrections by stopping charge/discharge operations before errors become significant. The control unit proactively stops operations at predetermined intervals to reset the SOC calculation, preventing large cumulative errors from developing, thereby maintaining accuracy without requiring frequent interruptions.
3Measurement precision
If charge/discharge operations are stopped to reset SOC calculation, then SOC calculation accuracy is improved, but operational efficiency deteriorates
Solution Approach 1:
The system implements periodic stop operations at predetermined intervals rather than continuous operation, allowing SOC calculation resets while minimizing interruptions. The control unit stops charge/discharge only at predetermined intervals and for limited predetermined periods, then resumes operations, thereby maintaining operational efficiency while improving SOC calculation accuracy through periodic corrections.
Solution Approach 2:
The charge/discharge operations continue for most of the time with only brief periodic interruptions. By resuming operations after predetermined waiting periods and limiting stop frequency to predetermined intervals, the system maintains continuous useful action throughout most operation time, preserving operational efficiency while achieving necessary SOC calculation accuracy through minimal periodic resets.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for highly accurate continuous calculation of the SOC, reducing cumulative errors and maintaining calculation accuracy by periodically replacing operation time SOC with stop time SOC, thereby stabilizing power supply in power systems.
Implementation Method 1
The storage battery system is used as a means for stabilizing power supplied to a load system by the power generation system and the power system
Implementation Method 2
estimates a stop time SOC of the storage battery on the basis of a voltage value supplied from the battery management unit
Data Source
AI summary
A charge/discharge management device relating to the present invention is provided in equipment including a storage battery system. The storage battery system includes a plurality of PCS groups. Each of the PCS groups includes a storage battery, a BMU, and a PCS. The charge/discharge management device includes an operation time SOC calculation unit, a stop time SOC estimation unit, and an initial SOC resetting unit. The operation time SOC calculation unit calculates an operation time SOC for which an SOC based on an integrated value of a current value supplied from the BMU is added to an initial SOC of the storage battery, for each of the plurality of PCS groups. The stop time SOC estimation unit stops charge/discharge of the some group in the case that a stop condition is established, and thereafter, estimates a stop time SOC of the storage battery based on a voltage value supplied from the BMU for the some group. The initial SOC resetting unit resets the initial SOC that the operation time SOC calculation unit has with the stop time SOC, and resets the integrated value that the operation time SOC calculation unit has.