Aircraft Bus Bar Voltage Control Under Fuel Cell Response Delay
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Solution Overview
Problem
Maintaining bus bar voltage within a predefined operating range is challenging during high electrical power demand in aircraft electrical systems, particularly when the fuel cell cannot meet the power demand within a predetermined time interval.
Innovation Solution
A method involving a compressor mode switch to boosted mode and controlled modification of load power supply, prioritizing dissipative loads, to stabilize bus bar voltage by temporarily adjusting power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell increases power output to meet high electrical demand, then the power delivery capability is improved, but the response time exceeds the predetermined time interval
Solution Approach 1:
The system performs preliminary action by switching the compressor to boosted mode in advance when voltage regulation is needed. This pre-positioning of the compressor allows the fuel cell to rapidly increase power output without exceeding the predetermined response time, as the compressor is already prepared to handle the increased air flow demand.
Solution Approach 2:
The system applies dynamics by enabling the compressor to switch between nominal and boosted modes based on real-time voltage conditions. This dynamic adjustment allows the system to rapidly respond to high electrical demand by increasing compressor capacity, thereby enabling the fuel cell to meet power delivery requirements within the specified time interval.
2Stability of the object's composition
If the bus bar voltage is maintained within operating range during high power demand, then the voltage stability is improved, but the power delivery capability is limited
Solution Approach 1:
The system uses feedback by continuously monitoring bus bar voltage and using this information to control compressor mode and load power supply modification. When voltage deviates from the operating range during high power demand, the feedback mechanism triggers compressor mode switching and coordinated load adjustments, enabling the system to maintain voltage stability while maximizing power delivery capability.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting compressor operating mode (nominal to boosted) and modifying power supply to loads based on voltage conditions. These parameter changes enable the system to maintain bus bar voltage within the predefined operating range while simultaneously maximizing the fuel cell's power delivery capability during high electrical demand.
3Power
If the compressor operates in boosted mode to increase power output, then the power delivery capability is improved, but the energy consumption increases
Solution Approach 1:
The system applies dynamics by enabling the compressor to switch between nominal and boosted modes based on real-time voltage conditions. This dynamic adjustment allows the system to rapidly respond to high electrical demand by increasing compressor capacity, thereby enabling the fuel cell to meet power delivery requirements within the specified time interval.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting compressor operating mode (nominal to boosted) and modifying power supply to loads based on voltage conditions. These parameter changes enable the system to maintain bus bar voltage within the predefined operating range while simultaneously maximizing the fuel cell's power delivery capability during high electrical demand.
Data Source
Figure 1
Figure 2a~3b
AI summary
Method for regulating the voltage of at least one bus bar (12) of an electrical system (10), the bar being powered by at least one source, the source being a battery system (14) comprising at least one fuel cell (15) and a compressor (16) associated with the fuel cell, the bar also powering loads including at least one dissipative load, the method comprising the step of, if the compressor is switched into doped mode, controlling a modification of the electrical power supply of at least one of the loads, starting first with the dissipative load(s).