Phase Battery Pack Setpoint Control for Charge Balance
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Solution Overview
Problem
In electric power-supply systems with separate battery packs for each phase, imbalances occur due to differences in battery state, charge, temperature, and health, leading to uneven charging or discharging and potential premature exhaustion of battery packs.
Innovation Solution
A control method that adjusts setpoint values for each battery pack based on its state parameters, using correction blocks to equalize the state of charge, temperature, and health across all packs, employing correction mechanisms like weighting coefficients, integral correctors, and voltage-saturation control to ensure balanced operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate battery packs are used for each phase, then the system can operate independently per phase, but imbalances occur between battery packs leading to premature exhaustion
Solution Approach 1:
The control system continuously monitors the state parameters (state of charge, temperature, health) of each battery pack and uses this feedback information to dynamically adjust the setpoint values. The correction block receives real-time state parameters and modifies the setpoints accordingly, creating a closed-loop control system that maintains balance between battery packs while allowing independent phase operation.
Solution Approach 2:
The invention changes the setpoint parameters (voltage, current, or power) for each battery pack based on their individual state parameters. By dynamically adjusting these parameters according to the actual state of each battery pack, the system compensates for imbalances and ensures all packs operate within safe limits, preventing premature exhaustion while maintaining independent operation capability.
2Productivity
If different powers are drawn from each battery pack, then each phase can be controlled independently, but the imbalance between battery packs increases over time
Solution Approach 1:
The control method dynamically changes the setpoint parameters for each battery pack based on their individual state parameters. When one battery pack shows signs of imbalance (different state of charge, temperature, or health), the correction block adjusts its setpoint values to reduce the power draw or charge rate, thereby maintaining state consistency across all packs while preserving independent phase control capability.
Solution Approach 2:
The system continuously monitors state parameters and uses this feedback to adjust setpoints in real-time. The correction block receives state parameter information and modifies the setpoints to compensate for imbalances, creating a feedback mechanism that maintains battery pack consistency during independent phase operation.
3Device complexity
If no correction is applied to setpoint values, then the control system is simpler, but the battery packs experience uneven charging or discharging
Solution Approach 1:
The correction block introduces dynamic parameter changes to the setpoint values based on battery pack state parameters. This adds a layer of complexity to the control system, but it is necessary to ensure uniform charging or discharging operation. The parameter changes are calculated based on the difference between individual pack states and optimal values, providing the complexity needed to maintain reliability.
Data Source
AI summary
A method for controlling a power supply device of an electrical system, the device including at least one separate power supply assembly per phase of the electrical system, each power supply assembly including at least one battery pack defined by a state parameter and provided with at least one battery to supply a control voltage to the phase to which it is connected, taking into account at least one setpoint value. The method includes executing at least one correction block receiving as input each setpoint value and the state parameter of each battery pack of the power supply assemblies of the system, and for each power supply assembly, the correction block is configured to determine a correction value to be applied directly or indirectly to its setpoint value.