Fuel Cell UPS Integrating Bypass Path to Reduce Power Electronics
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Solution Overview
Problem
Conventional UPS systems relying on batteries for backup power are insufficient for extended outages, and integrating fuel cells as a backup power source requires excessive and redundant power electronics, increasing costs and environmental footprint, while existing systems fail to leverage fuel cells' potential for power conditioning and management.
Innovation Solution
A power system incorporating a primary power source, an electrochemical fuel cell as a backup power source, and an energy storage device, with a control system that manages power transitions and conditioning, allowing the fuel cell and energy storage device to share power and export it back to the grid, thereby simplifying the design and reducing redundant components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If fuel cells are integrated as backup power sources in conventional UPS systems, then backup power duration is improved, but device complexity increases due to excessive and redundant power electronics
Solution Approach 1:
The patent merges the fuel cell integration path with the existing bypass path by configuring the fuel cell output to connect to the bypass input through a transfer switch. This eliminates the need for separate power electronics converters for fuel cell integration, as the existing bypass infrastructure is reused. The fuel cell directly outputs power that can be switched into the system without additional conversion equipment.
Solution Approach 2:
The existing bypass infrastructure in the UPS system is made multi-functional by enabling it to handle both traditional bypass operations and fuel cell power integration. The transfer switch and bypass circuitry serve dual purposes: traditional bypass functionality and fuel cell power input routing. This universal approach eliminates redundant components and reduces overall system complexity.
2Object-affected harmful factors
If fuel cells are used as backup power sources, then environmental impact is improved, but device complexity increases due to additional power electronics requirements
Solution Approach 1:
The patent combines the fuel cell power integration function with the existing bypass path infrastructure. By routing fuel cell output through the transfer switch to the bypass input, the system utilizes already-present power electronics components rather than adding new converters or transformation equipment. This merging approach maintains environmental benefits while avoiding increased device complexity.
Solution Approach 2:
The system uses its own existing bypass infrastructure to handle fuel cell power integration, making the system self-sufficient. No external or additional power electronics are required because the bypass path and transfer switch already provide the necessary functionality. The system serves its own integration needs using existing components.
3Reliability
If fuel cells ramp up power output gradually, then reliability is improved, but loss of time increases during the ramp-up period
Solution Approach 1:
The patent introduces the energy storage device as an intermediary between the fuel cell and the load. During the fuel cell's gradual ramp-up period, the energy storage device immediately supplies power to the load, bridging the time gap. This mediator approach allows the fuel cell to ramp up reliably without causing power interruptions, as the energy storage device handles the immediate power delivery needs.
Solution Approach 2:
The energy storage device is pre-charged and positioned to immediately supply power during the fuel cell ramp-up period. This preliminary preparation ensures that when the fuel cell begins operation, the load already has power coverage from the energy storage device, eliminating any time loss or interruption during the transition.
4Duration of action of moving object
If batteries are used for extended backup power, then duration of action is improved, but cost and footprint increase
Solution Approach 1:
The patent changes the power source parameter from battery-based to fuel cell-based backup power. Fuel cells provide extended duration power (24-48 hours) without requiring large quantities of battery cells. By switching the energy storage mechanism from chemical batteries to electrochemical fuel cells with external fuel storage, the system achieves longer backup duration with reduced footprint and quantity of active components.
Solution Approach 2:
The patent segments the backup power function into two separate components: the fuel cell for extended duration power generation and the energy storage device for immediate power delivery during ramp-up. This segmentation allows the fuel cell to provide long-term backup without requiring proportionally large battery banks, as the energy storage device handles only the transient ramp-up period while the fuel cell provides the sustained power supply.
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 provides reliable, high-quality backup power during outages, reduces the need for redundant electronics, and optimizes fuel cell usage for power sharing and grid integration, enhancing the efficiency and sustainability of UPS systems in critical environments.
Implementation Method 1
Fuel cells that use hydrogen and oxygen, or other chemical combinations, to generate electricity via electrochemical reactions
Data Source
AI summary
An uninterruptible power supply (UPS) system or other power system includes a primary power source and a fuel cell and battery system as a backup power source. The fuel cell and battery backup system(s) are integrated into the primary power source to reduce the required power components and to provide high-quality power conditioning for the UPS system. A control system receives and analyzes data from the primary power source, as well as from the fuel cell and battery backup systems, to perform advanced power management and sharing, manage transitions, export power to the grid, and manage boil-off losses at the fuel cell.