Three-level Z-source hybrid direct AC-AC power converter topology
Voltage source inverter (VSI) is the traditional power converter used to provide variable voltage and frequency from a fixed voltage supply for adjustable speed drive and many other applications. However, the maximum ac output voltage that can be synthesized by a VSI is limited to the available dc-l...
| Main Author: | |
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| Format: | Thesis (University of Nottingham only) |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/14007/ |
| _version_ | 1848791859285983232 |
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| author | Effah, Francis Boafo |
| author_facet | Effah, Francis Boafo |
| author_sort | Effah, Francis Boafo |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Voltage source inverter (VSI) is the traditional power converter used to provide variable voltage and frequency from a fixed voltage supply for adjustable speed drive and many other applications. However, the maximum ac output voltage that can be synthesized by a VSI is limited to the available dc-link voltage.
With its unique structure, the Z-source inverter can utilise shoot-through states to boost the output voltage and provides an attractive single-stage dc-ac conversion that is able to buck and boost the voltage. For applications with a variable input voltage, this inverter is a very competitive topology. The same concept can equally be extended to the two-stage matrix converter, where a single Z-source network is inserted in its virtual dc-link. The topology formed is, thus, quite straightforward. Its modulation is, however, non-trivial if advantages like voltage buck-boost flexibility, minimum commutation count, ease of implementation, and sinusoidal input and output quantities are to be attained simultaneously.
This thesis presents two novel space vector modulation methods for controlling a three-level Z-source neutral point clamped VSI to enable the use of a boost function. The second of the two space vector modulation methods is then adopted and applied to a three-level, two-stage matrix converter with a Z-source network inserted in its virtual dc-link to increase the voltage transfer ratio beyond the intrinsic 86.6\% limit. Simulation results are supported by experimental verification from two laboratory prototype converters. |
| first_indexed | 2025-11-14T18:35:12Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-14007 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T18:35:12Z |
| publishDate | 2014 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-140072025-02-28T11:28:22Z https://eprints.nottingham.ac.uk/14007/ Three-level Z-source hybrid direct AC-AC power converter topology Effah, Francis Boafo Voltage source inverter (VSI) is the traditional power converter used to provide variable voltage and frequency from a fixed voltage supply for adjustable speed drive and many other applications. However, the maximum ac output voltage that can be synthesized by a VSI is limited to the available dc-link voltage. With its unique structure, the Z-source inverter can utilise shoot-through states to boost the output voltage and provides an attractive single-stage dc-ac conversion that is able to buck and boost the voltage. For applications with a variable input voltage, this inverter is a very competitive topology. The same concept can equally be extended to the two-stage matrix converter, where a single Z-source network is inserted in its virtual dc-link. The topology formed is, thus, quite straightforward. Its modulation is, however, non-trivial if advantages like voltage buck-boost flexibility, minimum commutation count, ease of implementation, and sinusoidal input and output quantities are to be attained simultaneously. This thesis presents two novel space vector modulation methods for controlling a three-level Z-source neutral point clamped VSI to enable the use of a boost function. The second of the two space vector modulation methods is then adopted and applied to a three-level, two-stage matrix converter with a Z-source network inserted in its virtual dc-link to increase the voltage transfer ratio beyond the intrinsic 86.6\% limit. Simulation results are supported by experimental verification from two laboratory prototype converters. 2014-07-09 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en arr https://eprints.nottingham.ac.uk/14007/1/fbeffah_thesis_final_3rd_Feb_2014.pdf Effah, Francis Boafo (2014) Three-level Z-source hybrid direct AC-AC power converter topology. PhD thesis, University of Nottingham. Z-source Space vector modulation Two-stage matrix converter Voltage source inverter |
| spellingShingle | Z-source Space vector modulation Two-stage matrix converter Voltage source inverter Effah, Francis Boafo Three-level Z-source hybrid direct AC-AC power converter topology |
| title | Three-level Z-source hybrid direct AC-AC power converter topology |
| title_full | Three-level Z-source hybrid direct AC-AC power converter topology |
| title_fullStr | Three-level Z-source hybrid direct AC-AC power converter topology |
| title_full_unstemmed | Three-level Z-source hybrid direct AC-AC power converter topology |
| title_short | Three-level Z-source hybrid direct AC-AC power converter topology |
| title_sort | three-level z-source hybrid direct ac-ac power converter topology |
| topic | Z-source Space vector modulation Two-stage matrix converter Voltage source inverter |
| url | https://eprints.nottingham.ac.uk/14007/ |