Power electronic for electrolysers
Hydrogen is a viable sustainable energy source, crucial for reducing carbon emissions and supporting the transition to a low-carbon economy. As countries strive to meet climate targets, hydrogen production through electrolysis has gained significant attention. This study explores hydrogen prod...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
Nanyang Technological University
2024
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| Online Access: | https://hdl.handle.net/10356/181676 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Hydrogen is a viable sustainable energy source, crucial for reducing carbon emissions
and supporting the transition to a low-carbon economy. As countries strive to meet
climate targets, hydrogen production through electrolysis has gained significant
attention. This study explores hydrogen production via electrolysis, focusing on the
role of power converter topologies in improving the efficiency of grid-connected and
off-grid electrolysers. Starting with a comprehensive overview of hydrogen
production, the research examines the key distinctions among various electrolysis
processes. Key electrical parameters and AC-DC converter requirements are discussed
to understand their influence on electrolyser performance. Subsequent chapters delve
into uncontrolled and controlled power converter topologies. The use of a diode
rectifier provides an uncontrolled voltage and current that is heavily reliant on the
electrolyser parameters. Thyristor-based rectifiers are reviewed as a way for output
voltage and current to be controlled. However, the downside to the thyristor-based
rectifier is the much higher ripple factors compared to their diode counterpart. To
bridge these topologies, the diode-chopper circuit is introduced, combining low ripple
factors with controllability via DC-DC converters. The research also addresses
renewable off-grid connections, particularly wind and photovoltaic systems, and their
integration with electrolysers. In addition, the study proposes multi-stacked
electrolyser configurations in series and parallel setups for high-power applications,
assessing electrothermal balance to optimize performance in solid oxide electrolysis.
This paper highlights that electrolyser efficiency can be increased through different
converter topologies and configurations, setting the stage for future work aimed at
enhancing large-scale hydrogen production capabilities. |
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