Fuel Cell Stack Load Sharing Under Voltage and Resistance Variation
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Solution Overview
Problem
Hydrogen fuel cell vehicles face challenges with non-uniform current distribution and unstable operation due to varying voltages and internal resistances among cell stacks, affecting overall efficiency and life.
Innovation Solution
A coordinated optimization method and system that determines target output parameters and dynamically adjusts the operating states of sub-stacks based on efficiency and stability scores, using machine learning models and fuzzy logic to ensure uniform load sharing and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple cell stacks are connected in parallel to satisfy high-power demand, then the power output is improved, but non-uniform current distribution and voltage differences occur among stacks
Solution Approach 1:
The patent applies local quality by evaluating and differentiating the performance characteristics of each individual cell stack through efficiency scores and stability scores. Each stack is assigned a primary or secondary role based on its specific performance attributes, allowing the system to optimize current distribution by directing more current to higher-performing stacks while protecting lower-performing stacks from excessive current that would cause instability or damage.
2Adaptability or versatility
If cell stacks with different internal resistances are operated together, then the system can tolerate manufacturing variations, but power outputs become non-uniform and load sharing is unbalanced
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the operating parameters of each cell stack based on real-time monitoring of efficiency and stability metrics. The system modifies current allocation, voltage regulation, and operational modes for individual stacks according to their specific internal resistance characteristics and performance degradation patterns, thereby optimizing load sharing while accommodating manufacturing variations and aging effects.
3Stability of the object's composition
If cell stacks operate at same voltage with varying internal resistances, then voltage stability is maintained, but power outputs differ due to aging and temperature changes
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring the efficiency scores and stability scores of each cell stack and using this information to dynamically adjust current distribution and operational parameters. The system incorporates real-time performance data, aging indicators, and temperature measurements to modify power allocation, ensuring that voltage stability is maintained while compensating for power output differences caused by varying internal resistances, aging, and thermal conditions.
Data Source
AI summary
A coordinated optimization method and system for a hydrogen fuel cell vehicle, a device, and a medium. The method includes: determining a target output voltage and a target output current corresponding to a stack in a hydrogen fuel cell vehicle; determining a sub-stack efficiency score corresponding to one of sub-stacks, and determining a sub-stack stability score corresponding to the sub-stack; obtaining a comprehensive score of the sub-stack efficiency score and the sub-stack stability score, and determining a primary stack and a secondary stack from the sub-stacks according to a comprehensive score result; generating, according to the target output voltage and the target output current, a primary stack output parameter corresponding to the primary stack and a secondary stack output parameter corresponding to the secondary stack; and dynamically adjusting an operating state of the primary stack, and dynamically adjusting an operating state of the secondary stack.