Nested Control Loops for Hybrid Propulsion Current Limits
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Solution Overview
Problem
Existing power management systems in hybrid electric propulsion systems struggle with controlling current flow into and out of batteries, leading to inefficiencies and potential overcharging or discharging issues.
Innovation Solution
A control system that includes a generator module, an electric energy storage module, and a control module to monitor and manage current limits, adjusting power consumption and distribution between a generator and battery to prevent exceedance, and modulate power supply based on charge feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the generator outputs maximum power to charge the battery, then the charging speed increases, but the generator current limit is exceeded causing system instability
Solution Approach 1:
The control system dynamically adjusts the generator's power output based on real-time monitoring of battery charge state and generator current limits. The generator controller modulates the generator's electrical output to maintain operation within safe current boundaries while maximizing charging efficiency, transforming the static maximum power output into a dynamically optimized power delivery that adapts to system conditions.
Solution Approach 2:
The system implements a feedback control mechanism where the controller continuously monitors the generator's current output and battery charge state, then adjusts the generator's power output accordingly. This closed-loop control ensures the generator operates at optimal power levels without exceeding current limits, resolving the contradiction between charging speed and system stability through real-time feedback adjustment.
2Power
If the battery discharges at maximum rate to power the electric machine, then the power availability increases, but the battery current limit is exceeded causing damage
Solution Approach 1:
The control system dynamically adjusts the battery's discharge rate based on real-time monitoring of battery current limits and power demand. The controller modulates the battery's electrical output to maintain adequate power supply to the electric machine while keeping discharge current within safe boundaries, transforming the static maximum discharge rate into a dynamically optimized power delivery that prevents battery damage.
Solution Approach 2:
The system implements a feedback control mechanism where the controller continuously monitors the battery's current output and adjusts the discharge rate accordingly. This closed-loop control ensures the battery provides sufficient power to the electric machine without exceeding current limits that could cause damage, resolving the contradiction between power availability and battery protection through real-time feedback adjustment.
3Device complexity
If the generator and battery operate independently, then the control complexity is reduced, but the power management efficiency decreases
Solution Approach 1:
The system merges the control of the generator and battery into a unified power management system. The controller coordinates the operation of both power sources, intelligently determining when to charge the battery from the generator, when to discharge the battery to supplement generator output, and how to balance their contributions to meet overall power demands. This integrated approach optimizes power management efficiency while maintaining manageable control complexity through a centralized control architecture.
Data Source
AI summary
A method for controlling an electric machine of an aircraft, has: monitoring an electric energy storage module associated with the electric machine for an exceedance of a current limit associated with the electric energy storage module; monitoring a generator module associated with the electric machine for an exceedance of a current limit associated with the generator module; and when one or both of the current limit associated with the electric energy storage module and the current limit associated with the generator module is exceeded by a respective exceedance amount, reducing a power consumption of the electric machine below a normal operating target by means of a bias on a controller until the exceedance of the current limit associated with the electric energy storage and the exceedance of the current limit associated with the generator module reach a specified amount.