An Efficient Reduced-Order Model for Studying Synchronization Stability of Grid-Following Converters during Grid Faults

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Abstract

Renewable energy sources interfaced with the grid through power-electronic converters may lose stability and capability to perform as desired when exposed to severe grid faults. As a result of this, transient stability analysis and assessment are particularly important for power system studies. Usually, synchronization stability and transient stability analysis are performed by simulation studies containing a large amount of details, which makes this process highly time-consuming for large-scale systems. To circumvent this issue, a nonlinear second-order model is developed to capture the essential effects of the synchronization process of grid-tied converters during faults. Due to this low-order model, the stability assessment can be approached using phase-plane analysis with a low computational burden - more than 4000 times faster than the full-order switching model. The simplified model is verified against a detailed switching model and laboratory setup of the entire converter system indicating a high accuracy (>96%). Accordingly, the simplified reduced-order model can be used for accurate transient stability studies when a low availability of computational power is present, if large-scale systems are considered, or for detailed uncertainty and sensitivity analysis.
Original languageEnglish
Title of host publicationProceedings of 2019 IEEE COMPEL
Number of pages7
PublisherIEEE Press
Publication dateJun 2019
Publication statusAccepted/In press - Jun 2019

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Synchronization
Large scale systems
Uncertainty analysis
Power electronics
Sensitivity analysis
Availability

Keywords

  • Grid fault
  • Transient Stability
  • Reduced-order model
  • Grid-connected converters

Cite this

@inproceedings{62227edf727941ed9a8d2e336804333b,
title = "An Efficient Reduced-Order Model for Studying Synchronization Stability of Grid-Following Converters during Grid Faults",
abstract = "Renewable energy sources interfaced with the grid through power-electronic converters may lose stability and capability to perform as desired when exposed to severe grid faults. As a result of this, transient stability analysis and assessment are particularly important for power system studies. Usually, synchronization stability and transient stability analysis are performed by simulation studies containing a large amount of details, which makes this process highly time-consuming for large-scale systems. To circumvent this issue, a nonlinear second-order model is developed to capture the essential effects of the synchronization process of grid-tied converters during faults. Due to this low-order model, the stability assessment can be approached using phase-plane analysis with a low computational burden - more than 4000 times faster than the full-order switching model. The simplified model is verified against a detailed switching model and laboratory setup of the entire converter system indicating a high accuracy (>96{\%}). Accordingly, the simplified reduced-order model can be used for accurate transient stability studies when a low availability of computational power is present, if large-scale systems are considered, or for detailed uncertainty and sensitivity analysis.",
keywords = "Grid fault, Transient Stability, Reduced-order model, Grid-connected converters",
author = "Taul, {Mads Graungaard} and Xiongfei Wang and Pooya Davari and Frede Blaabjerg",
year = "2019",
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language = "English",
booktitle = "Proceedings of 2019 IEEE COMPEL",
publisher = "IEEE Press",

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An Efficient Reduced-Order Model for Studying Synchronization Stability of Grid-Following Converters during Grid Faults. / Taul, Mads Graungaard; Wang, Xiongfei; Davari, Pooya; Blaabjerg, Frede.

Proceedings of 2019 IEEE COMPEL. IEEE Press, 2019.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - An Efficient Reduced-Order Model for Studying Synchronization Stability of Grid-Following Converters during Grid Faults

AU - Taul, Mads Graungaard

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AU - Davari, Pooya

AU - Blaabjerg, Frede

PY - 2019/6

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N2 - Renewable energy sources interfaced with the grid through power-electronic converters may lose stability and capability to perform as desired when exposed to severe grid faults. As a result of this, transient stability analysis and assessment are particularly important for power system studies. Usually, synchronization stability and transient stability analysis are performed by simulation studies containing a large amount of details, which makes this process highly time-consuming for large-scale systems. To circumvent this issue, a nonlinear second-order model is developed to capture the essential effects of the synchronization process of grid-tied converters during faults. Due to this low-order model, the stability assessment can be approached using phase-plane analysis with a low computational burden - more than 4000 times faster than the full-order switching model. The simplified model is verified against a detailed switching model and laboratory setup of the entire converter system indicating a high accuracy (>96%). Accordingly, the simplified reduced-order model can be used for accurate transient stability studies when a low availability of computational power is present, if large-scale systems are considered, or for detailed uncertainty and sensitivity analysis.

AB - Renewable energy sources interfaced with the grid through power-electronic converters may lose stability and capability to perform as desired when exposed to severe grid faults. As a result of this, transient stability analysis and assessment are particularly important for power system studies. Usually, synchronization stability and transient stability analysis are performed by simulation studies containing a large amount of details, which makes this process highly time-consuming for large-scale systems. To circumvent this issue, a nonlinear second-order model is developed to capture the essential effects of the synchronization process of grid-tied converters during faults. Due to this low-order model, the stability assessment can be approached using phase-plane analysis with a low computational burden - more than 4000 times faster than the full-order switching model. The simplified model is verified against a detailed switching model and laboratory setup of the entire converter system indicating a high accuracy (>96%). Accordingly, the simplified reduced-order model can be used for accurate transient stability studies when a low availability of computational power is present, if large-scale systems are considered, or for detailed uncertainty and sensitivity analysis.

KW - Grid fault

KW - Transient Stability

KW - Reduced-order model

KW - Grid-connected converters

M3 - Article in proceeding

BT - Proceedings of 2019 IEEE COMPEL

PB - IEEE Press

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