Bidirectional DC/DC Converters in Fuel Cell Microgrids
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Solution Overview
Problem
Fuel cell microgrid systems face inefficiencies and increased costs due to the need for redundant DC/DC converters to account for degradation and failures, leading to power loss, larger physical footprints, and limited bus sizes.
Innovation Solution
Implementing a fuel cell microgrid system with multiple bidirectional DC/DC converters connected in parallel and in series, allowing for efficient power transfer between modules and reducing the electrical power rating of individual converters, thereby managing power output and accommodating failures without the need for excessive redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant DC/DC converters are used to account for degradation and failures, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
Multiple DC/DC converters are merged into a single parallel configuration where they share common input and output buses. This allows the system to achieve redundancy and reliability through the combined capacity of multiple converters without requiring complex switching mechanisms or multiple separate power paths, thus improving reliability while limiting the increase in device complexity.
Solution Approach 2:
The power conversion function is segmented across multiple DC/DC converters rather than using a single converter. Each converter handles a portion of the total power load, and they operate independently in parallel. This segmentation provides redundancy (if one converter fails, others continue operating) while keeping individual converter complexity low and manageable.
2Reliability
If redundant DC/DC converters are used to account for degradation and failures, then reliability is improved, but physical footprint increases
Solution Approach 1:
Multiple DC/DC converters are merged into a single parallel configuration where they share common input and output buses. This allows the system to achieve redundancy and reliability through the combined capacity of multiple converters without requiring complex switching mechanisms or multiple separate power paths, thus improving reliability while limiting the increase in device complexity.
Solution Approach 2:
The system dynamically allocates power conversion tasks among multiple DC/DC converters operating in parallel. Each converter can independently adjust its operating point and power contribution based on system conditions and individual converter status, allowing efficient utilization of available converter capacity and reducing the need for excessive redundancy.
3Reliability
If higher electrical power rating converters are used to handle degradation, then reliability is improved, but bus size requirements increase
Solution Approach 1:
The power conversion function is segmented across multiple DC/DC converters rather than using a single converter. Each converter handles a portion of the total power load, and they operate independently in parallel. This segmentation provides redundancy (if one converter fails, others continue operating) while keeping individual converter complexity low and manageable.
Solution Approach 2:
The system changes the operational parameters of multiple DC/DC converters from a single high-power configuration to multiple lower-power parallel configurations. This parameter change allows the bus size to be optimized for the actual operating conditions of each converter, reducing the required bus size compared to a single high-power converter while maintaining the same total power capacity and reliability.
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 configuration enhances power efficiency, reduces costs, and manages failures effectively, maintaining reliable power supply while minimizing physical footprint and bus size requirements.
Implementation Method 1
a plurality of bidirectional DC/DC converters, each bidirectional DC/DC converter of the plurality of bidirectional DC/DC converters being electrically connected to at least one power module cluster
Data Source
AI summary
Various embodiments include methods and systems for implementing managing a microgrid system. The system may include a plurality of power module clusters, a plurality of uninterruptable power modules, a plurality of bidirectional direct current (DC)/DC converters, and a DC power bus. Each one of the power module clusters of the plurality of power module clusters may be electrically connected in parallel to an uninterruptable power module of the plurality of uninterruptable power modules and a first end of a bidirectional DC/DC converter of the plurality bidirectional DC/DC converters, and a second end of each one of the bidirectional DC/DC converters of the plurality of bidirectional DC/DC converters may be electrically connected to the DC power bus. In some embodiments, the plurality of bidirectional DC/DC converters may be electrically connected to in parallel by the DC power bus or in series via a DC power bus ring.