Delta-Connected Cascaded H-Bridge Multilevel Converters for Large-Scale Photovoltaic Grid Integration

Yifan Yu, Georgios Konstantinou, Christopher D. Townsend, Ricardo P. Aguilera, Vassilios G. Agelidis

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The cascaded H-bridge (CHB) converter is becoming a promising candidate for use in next generation large-scale photovoltaic (PV) power plants. However, solar power generation in the three converter phase-legs can be significantly unbalanced, especially in a large geographically-dispersed plant. The power imbalance between the three phases defines a limit for the injection of balanced three-phase currents to the grid. This paper quantifies the performance of, and experimentally confirms, the recently proposed delta-connected CHB converter for PV applications as an alternative configuration for large-scale PV power plants. The required voltage and current overrating for the converter is analytically developed and compared against the star-connected counterpart. It is shown that the delta-connected CHB converter extends the balancing capabilities of the star-connected CHB and can accommodate most imbalance cases with relatively small overrating. Experimental results from a laboratory prototype are provided to validate the operation of the delta-connected CHB converter under various power imbalance cases.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Volume64
Pages (from-to)8877-8886
ISSN0278-0046
DOIs
Publication statusPublished - 2017

Keywords

  • AC–DC power converters
  • Cascaded Hbridge (CHB) converter
  • Multilevel converter
  • Photovoltaic (PV)

Cite this

Yu, Yifan ; Konstantinou, Georgios ; Townsend, Christopher D. ; Aguilera, Ricardo P. ; Agelidis, Vassilios G. / Delta-Connected Cascaded H-Bridge Multilevel Converters for Large-Scale Photovoltaic Grid Integration. In: I E E E Transactions on Industrial Electronics. 2017 ; Vol. 64. pp. 8877-8886.
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title = "Delta-Connected Cascaded H-Bridge Multilevel Converters for Large-Scale Photovoltaic Grid Integration",
abstract = "The cascaded H-bridge (CHB) converter is becoming a promising candidate for use in next generation large-scale photovoltaic (PV) power plants. However, solar power generation in the three converter phase-legs can be significantly unbalanced, especially in a large geographically-dispersed plant. The power imbalance between the three phases defines a limit for the injection of balanced three-phase currents to the grid. This paper quantifies the performance of, and experimentally confirms, the recently proposed delta-connected CHB converter for PV applications as an alternative configuration for large-scale PV power plants. The required voltage and current overrating for the converter is analytically developed and compared against the star-connected counterpart. It is shown that the delta-connected CHB converter extends the balancing capabilities of the star-connected CHB and can accommodate most imbalance cases with relatively small overrating. Experimental results from a laboratory prototype are provided to validate the operation of the delta-connected CHB converter under various power imbalance cases.",
keywords = "AC–DC power converters, Cascaded Hbridge (CHB) converter, Multilevel converter, Photovoltaic (PV)",
author = "Yifan Yu and Georgios Konstantinou and Townsend, {Christopher D.} and Aguilera, {Ricardo P.} and Agelidis, {Vassilios G.}",
year = "2017",
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Delta-Connected Cascaded H-Bridge Multilevel Converters for Large-Scale Photovoltaic Grid Integration. / Yu, Yifan; Konstantinou, Georgios; Townsend, Christopher D.; Aguilera, Ricardo P.; Agelidis, Vassilios G.

In: I E E E Transactions on Industrial Electronics, Vol. 64, 2017, p. 8877-8886.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Delta-Connected Cascaded H-Bridge Multilevel Converters for Large-Scale Photovoltaic Grid Integration

AU - Yu, Yifan

AU - Konstantinou, Georgios

AU - Townsend, Christopher D.

AU - Aguilera, Ricardo P.

AU - Agelidis, Vassilios G.

PY - 2017

Y1 - 2017

N2 - The cascaded H-bridge (CHB) converter is becoming a promising candidate for use in next generation large-scale photovoltaic (PV) power plants. However, solar power generation in the three converter phase-legs can be significantly unbalanced, especially in a large geographically-dispersed plant. The power imbalance between the three phases defines a limit for the injection of balanced three-phase currents to the grid. This paper quantifies the performance of, and experimentally confirms, the recently proposed delta-connected CHB converter for PV applications as an alternative configuration for large-scale PV power plants. The required voltage and current overrating for the converter is analytically developed and compared against the star-connected counterpart. It is shown that the delta-connected CHB converter extends the balancing capabilities of the star-connected CHB and can accommodate most imbalance cases with relatively small overrating. Experimental results from a laboratory prototype are provided to validate the operation of the delta-connected CHB converter under various power imbalance cases.

AB - The cascaded H-bridge (CHB) converter is becoming a promising candidate for use in next generation large-scale photovoltaic (PV) power plants. However, solar power generation in the three converter phase-legs can be significantly unbalanced, especially in a large geographically-dispersed plant. The power imbalance between the three phases defines a limit for the injection of balanced three-phase currents to the grid. This paper quantifies the performance of, and experimentally confirms, the recently proposed delta-connected CHB converter for PV applications as an alternative configuration for large-scale PV power plants. The required voltage and current overrating for the converter is analytically developed and compared against the star-connected counterpart. It is shown that the delta-connected CHB converter extends the balancing capabilities of the star-connected CHB and can accommodate most imbalance cases with relatively small overrating. Experimental results from a laboratory prototype are provided to validate the operation of the delta-connected CHB converter under various power imbalance cases.

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KW - Cascaded Hbridge (CHB) converter

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