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Compatibility Issues With Irregular Current Injection Islanding Detection Methods in Multi-DG Units Equipped With Grid-Connected Transformers

Liu, M.H.; Zhao, W.; Wang, Q.; Wang, Z.M.; Jiang, C.J.; Shu, J.; Wang, H.; Bai, Y.

Compatibility Issues With Irregular Current Injection Islanding Detection Methods in Multi-DG Units Equipped With Grid-Connected Transformers Thumbnail


Authors

M.H. Liu

W. Zhao

C.J. Jiang

J. Shu

Y. Bai



Abstract

Compatibility issues with irregular current injection islanding detection methods are actually the problem that some irregular currents at the same frequency injected into the same line may cancel each other out and then the islanding detection may be impaired, which have been discussed under direct couple conditions (i.e., conditions without grid-connected transformers) in the literature. This article analyzes the issues under the opposite conditions where distributed generation (DG) units are equipped with grid-connected transformers, and is aimed at finding a solution. The analysis derives the setting formulas of key parameters for both three-phase and single-phase DG units, and shows that considering fault tolerance and practicability, only specific frequencies can be used for irregular currents. The usable frequencies are different under different cases. These conclusions are different from those based on direct couple conditions. By summarizing the conclusions based on conditions with grid-connected transformers achieved in this article and those based on direct couple conditions in the literature, a complete solution to compatibility issues is obtained. The conclusions in this article have been verified by the experiments and simulations at the end of this article.

Citation

Liu, M., Zhao, W., Wang, Q., Wang, Z., Jiang, C., Shu, J., …Bai, Y. (2022). Compatibility Issues With Irregular Current Injection Islanding Detection Methods in Multi-DG Units Equipped With Grid-Connected Transformers. IEEE Transactions on Power Electronics, 37(3), 3599-3616. https://doi.org/10.1109/tpel.2021.3117879

Journal Article Type Article
Acceptance Date Sep 24, 2021
Online Publication Date Oct 6, 2021
Publication Date 2022-03
Deposit Date Dec 21, 2021
Publicly Available Date Jan 4, 2022
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 1941-0107
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 37
Issue 3
Pages 3599-3616
DOI https://doi.org/10.1109/tpel.2021.3117879
Public URL https://durham-repository.worktribe.com/output/1219923

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