Fuel Cell Module Grid-Synchronization During Power Outages
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Solution Overview
Problem
Line connection type fuel cell systems fail to generate power when the external power supply is cut off, disrupting normal operation.
Innovation Solution
A device and method that include an AC voltage generator and a controller to produce an AC voltage and frequency matching the power system's specifications, using an energy source like a fuel cell or battery, and an Automatic Transfer Switch to seamlessly transition between power sources, ensuring continuous operation during power failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel cell system operates in line connection mode relying on external power supply, then the system can generate power during normal operation, but the system fails to generate power when the external power supply is cut off
Solution Approach 1:
The system performs preliminary actions by pre-charging energy storage devices (capacitors and batteries) during normal operation when external power is available. This stored energy is then utilized immediately when external power fails, enabling seamless transition and maintaining power generation reliability without interruption.
Solution Approach 2:
Energy storage devices (capacitors and batteries) serve as intermediary components between the external power supply and the fuel cell system. These intermediaries buffer power fluctuations, store excess energy during normal operation, and supply power during outages, thereby resolving the contradiction between reliability and adaptability.
2Reliability
If the system uses self-generated power to supplement external power supply, then continuous operation can be maintained during power failures, but the system complexity increases due to additional components
Solution Approach 1:
The energy storage devices perform multiple functions: they charge during normal operation to supplement power, discharge during power failures to maintain operation, and provide voltage stabilization. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity while achieving continuous operation.
Solution Approach 2:
The patent combines multiple energy storage technologies (capacitors and batteries) into a hybrid system that works together. The capacitor handles high-power transient demands while the battery provides sustained energy storage, creating a unified power management architecture that maintains reliability without proportionally increasing complexity.
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
Enables immediate normal operation of the fuel cell system by generating power in synchronization with the AC voltage, even during power outages, by using self-generated power to supplement or replace external power supply.
Implementation Method 1
A fuel cell is a power generation system which directly converts the chemical reaction energy of hydrogen, which is contained in a hydrocarbon-based material such as hydrogen, methanol, and ethanol, and an oxidizing agent, into electrical energy.
Implementation Method 2
a DC/AC converter to convert a Direct Current (DC) voltage output from the energy source into the AC voltage having the voltage and the frequency corresponding to the power supplied from the system
Data Source
AI summary
A device for controlling a line connection type fuel cell system and a method for the same are provided. The device for controlling a line connection type fuel cell system includes a plurality of fuel cell modules, an Alternating Current (AC) voltage generator, and a controller to activate the AC voltage generator to generate an AC voltage corresponding to power supplied from a system, and to control the plurality of fuel cell modules to generate a current in synchronization with the AC voltage.