Fuel Cell Output Averaging With Battery Load Compensation
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Solution Overview
Problem
Existing fuel cell systems face inefficiencies due to suboptimal calculation cycles for average electric load values, leading to inappropriate fuel usage and insufficient power generation, as they either overreact to short-term load fluctuations or fail to meet power demands when cycles are too long.
Innovation Solution
A fuel cell system that includes a processor to calculate and set average electric power output values at predetermined cycles, compensating for output differences using a battery to optimize fuel usage and ensure consistent power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the calculation cycle of average electric load values is shortened, then the fuel cell output can respond to load fluctuations, but fuel efficiency deteriorates due to short-term fluctuations
Solution Approach 1:
The patent segments the power supply system into two distinct components: a fuel cell for base load power generation and a capacitor for short-term power supplementation. This segmentation allows the fuel cell to operate at optimal efficiency points while the capacitor handles transient load fluctuations, thereby resolving the contradiction between response speed and fuel efficiency.
Solution Approach 2:
The capacitor acts as an intermediary component between the fuel cell and the load. It absorbs short-term power fluctuations and releases stored energy during peak demand, mediating between the slow-responding fuel cell and the rapidly fluctuating load requirements, thus maintaining both fuel efficiency and response capability.
2Loss of energy
If the calculation cycle of average electric load values is lengthened, then fuel efficiency improves, but power supply capability deteriorates when rapid power is needed
Solution Approach 1:
The system segments power generation into base load (fuel cell) and peak load (capacitor) components. The fuel cell operates continuously at optimized efficiency points based on long-term average calculations, while the capacitor provides instantaneous power bursts during peak demand, thus simultaneously achieving fuel efficiency and power supply capability.
Solution Approach 2:
The capacitor is pre-charged during periods of low demand or when the fuel cell is operating at optimal efficiency, storing energy in advance. This preliminary energy storage enables the system to rapidly respond to peak power demands without compromising fuel efficiency during the charging phase.
3Measurement precision
If the fuel cell output is adjusted frequently to match instantaneous load, then power supply accuracy improves, but fuel consumption increases
Solution Approach 1:
The patent divides the power supply function into two segments: the fuel cell provides stable base load power at optimized operating points, while the capacitor handles instantaneous power adjustments. This segmentation ensures power supply accuracy is maintained through the capacitor's rapid response without forcing the fuel cell to operate inefficiently during transient conditions.
Solution Approach 2:
The capacitor serves as an intermediary that absorbs the discrepancy between fuel cell output and instantaneous load requirements. It compensates for power deficits or absorbs excess power during transient conditions, allowing the fuel cell to maintain steady, fuel-efficient operation while still achieving accurate power supply through the combined system output.
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
The system optimizes fuel consumption by gradually adjusting the fuel cell's output to match average power demands, improving thermal and fuel efficiency by leveraging the battery to compensate for instantaneous variations.
Implementation Method 1
a fuel cell that generates electric power using a fuel
Implementation Method 2
a battery that is able to charge and discharge electric power
Data Source
AI summary
The fuel cell system is provided with an ECU, and the ECU calculates an average value obtained by averaging the instantaneous output values sequentially requested by the fuel cell system in the average calculation time interval during which the fuel cell system operates, and calculates the average value. Each time the average value is calculated, the average value is sequentially set to the output value output by the fuel cell up to the next predetermined cycle, and each time the average value is calculated, the predetermined cycle is added to the average calculation time interval, and the fuel cell system The difference between the instantaneous output value and the output value of the fuel cell is compensated for by the output value due to the discharge of the battery.