Battery Droop Control for State-of-Charge Balancing
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Solution Overview
Problem
Aircraft hybrid-electric propulsion systems face performance losses due to uneven states of charge among batteries, which can result from uneven charging and aging, leading to inconsistent power delivery.
Innovation Solution
An electric power source system comprising a battery, a converter, and a controller with a compensation toggle circuit and dynamic droop control circuit that adjusts the output droop value based on the battery's state of charge to normalize the charge levels across multiple batteries, ensuring consistent power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are used to provide electric power, then the power capacity is increased, but the state of charge becomes uneven leading to system performance loss
Solution Approach 1:
The system dynamically changes the droop control parameter based on the state of charge of each battery. When a battery's state of charge deviates from the average, the controller adjusts its droop value to modify power distribution, thereby balancing the state of charge across all batteries while maintaining increased power capacity
Solution Approach 2:
The system continuously monitors the state of charge of each battery and uses this feedback to dynamically adjust the droop control parameters. The controller compares individual battery states with the average state and modifies power distribution in real-time to eliminate charge imbalances, ensuring consistent system performance
2Stability of the object's composition
If dynamic droop control is implemented to normalize battery charge levels, then state of charge consistency is improved, but control system complexity increases
Solution Approach 1:
The system transitions from static droop control to dynamic droop control where the droop parameter is continuously adjusted based on real-time state of charge measurements. This dynamic adaptation enables the system to automatically normalize battery charge levels without requiring complex external management systems
Solution Approach 2:
The control system uses the batteries' own state of charge information to self-regulate power distribution. Each battery's controller independently adjusts its droop value based on its own state relative to the group average, enabling autonomous charge balancing without centralized complex control
Data Source
AI summary
An electric power source includes: a battery defining a state of charge; a converter in electrical communication with the battery; and a controller in operable communication with the converter, the controller including a compensation toggle circuit configured to provide a compensation toggle value based on a power output of the battery; a dynamic droop control circuit configured to receive the compensation toggle value and switch an output droop value of the dynamic droop control circuit from an upper output droop measurement to a lower output droop measurement, wherein the lower output droop measurement is based on the state of charge of the battery.