Fuel Cell Stack Power Routing for Converter Load Reduction
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Solution Overview
Problem
In fuel cell systems, a significant portion of the power transmitted by the converter is consumed by media supply components, making it unavailable for the superordinate system and requiring converter resources for non-usable power conversion, leading to inefficiency and increased costs.
Innovation Solution
The method involves directly supplying electrical power to media supply components via the fuel cell stack during normal operation, bypassing the converter, and using a bidirectionally operable converter to provide power during startup, with a control unit coordinating the operation to ensure efficient energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the converter is used to supply power to media supply components, then the system can operate with a centralized power conversion architecture, but converter resources are wasted converting power that is not usable for the superordinate system, reducing overall system efficiency
Solution Approach 1:
The power supply architecture is segmented into two independent paths: (1) The converter supplies power only to the superordinate system, and (2) The fuel cell stack directly supplies power to media supply components through a direct connection. This segmentation eliminates the waste of converter resources on non-usable power while maintaining architectural simplicity through clear functional separation.
Solution Approach 2:
The power supply path for media supply components is extracted from the converter output and directly connected to the fuel cell stack. This extraction removes the unnecessary conversion step for media supply power, eliminating energy waste in the converter while keeping the overall system architecture manageable.
2Volume of stationary object
If the converter size is reduced to save space and costs, then the system becomes more compact and economical, but the converter may not have sufficient capacity to handle all power conversion requirements
Solution Approach 1:
The total power requirement is segmented between two sources: the converter handles only the superordinate system's power needs, while the fuel cell stack directly handles media supply component power needs. This segmentation allows the converter to be sized appropriately for its reduced workload, reducing its volume while maintaining sufficient capacity for its designated function.
3Loss of energy
If power is taken directly from the fuel cell stack for media supply components, then system efficiency increases and converter resources are conserved, but the component must support the voltage level of the fuel cell stack
Solution Approach 1:
The direct power connection from the fuel cell stack to media supply components creates a localized power supply system with specific voltage characteristics. Media supply components are designed with local quality adaptations to match the fuel cell stack's voltage level, ensuring efficient power transmission while maintaining component functionality through voltage-matched design.
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
This approach conserves converter resources, increases system efficiency, reduces converter size and costs, and allows for a smaller, more efficient design, while ensuring reliable startup and operation.
Implementation Method 1
the fuel cell stack is supplied with a medium via at least one component located in a supply path of the fuel cell system, the electrical energy is generated by means of the fuel cell stack using the medium
Data Source
AI summary
The invention relates to a method for operating a fuel cell system (1) having a fuel cell stack (2) and a converter (3) in which method, during operation of the fuel cell system (1),the fuel cell stack (2) is supplied with a medium via at least one component (4) located in a supply path of the fuel cell system (1),the electrical energy is generated by means of the fuel cell stack (2) using the medium and is conducted to the converter (3), andthe output voltage of the fuel cell stack (2) is converted by means of the converter (3) into a voltage of a higher-level system (5) and is made available to the higher-level system (4).According to the invention, during normal operation of the fuel cell system (1), the at least one component (4) for supplying the medium is directly supplied with electrical power via the fuel cell stack (2).The invention further relates to a fuel cell system (1) which is suitable for carrying out the method according to the invention.