Fuel Cell Power Converter with Dynamic Capacity Control
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Solution Overview
Problem
Existing power supply devices combining fuel cells and accumulators struggle to efficiently manage variable energy demands in user networks, as they lack centralized control over energy sources and inefficiently utilize fuel cell capacity.
Innovation Solution
A device with a fuel cell, accumulator, and an electrical energy converter, controlled by an electronic circuit that adjusts energy transfer capacity and selectively manages energy between the fuel cell and accumulator, allowing central selection of energy sources based on demand and accumulator charge levels, optimizing energy production and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the fuel cell operates at a fixed voltage level to optimize its efficiency, then the fuel cell efficiency is improved, but the system cannot adapt to variable energy demands of the user network
Solution Approach 1:
The patent implements dynamic control of the DC converter's transfer capacity, allowing the system to adapt between different operating modes. The electronic control circuit adjusts the converter's capacity dynamically based on energy demand and accumulator charge level, enabling the fuel cell to operate efficiently at optimal voltage while the system as a whole adapts to variable demands through the accumulator buffer and converter modulation.
2Device complexity
If the fuel cell directly supplies the user network without an accumulator, then the system complexity is reduced, but the system cannot provide immediate energy response to sudden demands
Solution Approach 1:
The accumulator serves as a preliminary energy buffer that can immediately respond to sudden energy demands before the fuel cell needs to ramp up its production. The control system anticipates energy needs by maintaining the accumulator charged, allowing immediate response to load changes without waiting for fuel cell adjustment, thus achieving fast response while keeping the fuel cell operating efficiently.
3Power
If the DC converter transfers maximum energy from the fuel cell, then the energy availability to the user network is increased, but the fuel cell efficiency decreases due to operating outside optimal voltage range
Solution Approach 1:
The DC converter acts as an intermediary between the fuel cell and the user network, decoupling their operational requirements. It selectively controls energy transfer from the fuel cell to either the user network or the accumulator based on real-time conditions, allowing the fuel cell to operate at optimal efficiency while the converter manages peak power delivery by drawing from the accumulator when needed.
4Device complexity
If the system uses only the fuel cell for energy supply, then the device complexity is reduced, but the system cannot selectively manage multiple energy sources based on demand and charge levels
Solution Approach 1:
The electronic control circuit is designed with multi-functionality, managing both the DC converter's transfer capacity and the accumulator's charge/discharge operations through a single centralized system. This universal controller optimizes the combination of fuel cell and accumulator usage based on energy demand and charge levels, achieving efficient multi-source energy management without proportionally increasing system 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
This solution enhances energy efficiency by optimizing fuel cell operation, increasing energy availability, and ensuring the accumulator meets immediate network needs while the fuel cell builds up, maintaining optimal efficiency and extending energy production from a given fuel quantity.
Implementation Method 1
a fuel cell; an electric energy accumulator; an electrical energy converter connected on the one hand to the fuel cell and on the other hand to a charging and discharging circuit of the accumulator
Data Source
Figure 1
Figure 2
AI summary
The device (1) has a converter (5) adapted to limit the ability of electrical energy transfer of a fuel cell (PAC) i.e. hydrogen fuel cell, of a user network (2). The fuel cell is arranged to have electric power that varies depending on capacity of transfer of electrical energy. An electronic control circuit (9) is connected to the converter to control variation of electrical energy transfer capacity. The fuel cell is arranged for an accumulator (4), and the electrical energy is transferred from the accumulator to supply terminals (8) of the user network.