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Comparative Analysis of Unbalanced Three-Phase Grid Current Compensation Methods for the Scott Transformer Based Grid

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A Correction to this article was published on 04 April 2023

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Abstract

This paper proposes two control algorithms to solve the three-phase power unbalance problem in the Scott transformer based grid, and two algorithms are power-based and current-based compensation method. The power-based compensation method uses the active/reactive power at the load side for control, and the current-based compensation method utilizes the Scott transformer secondary current directly to eliminate an effect of active/reactive power loss through the power supply chain. In addition, voltage notch effect generated by the low switching frequency and weak grid condition caused by the Scott transformer is compensated by using an observer. Performance comparisons for the two compensation methods are carried out using a real-time simulator and a 3-level back-to-back converter prototype with a 5kVA load. From the experimental results, recorded 34.2% of unbalance rate of the three-phase grid current before compensation is reduced to 2.8% by the power-based compensation method, and 1.2% by the current-based compensation method. This study provides a new insight into developing the advanced algorithms which improves the unbalance of three-phase grid current in electric railway transportation system.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1I1A3058123)

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  1. Department of Electrical Engineering, Chungnam National University, 99 Daehak-ro Yuseong-gu, Daejeon, 34134, Korea

    Joungjin Seo & Hanju Cha

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  1. Joungjin Seo
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  2. Hanju Cha
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Correspondence to Hanju Cha.

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The original online version of this article was revised: The 1st author name is given erroneously. This has been corrected.

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Seo, J., Cha, H. Comparative Analysis of Unbalanced Three-Phase Grid Current Compensation Methods for the Scott Transformer Based Grid. J. Electr. Eng. Technol. 18, 383–391 (2023). https://doi.org/10.1007/s42835-022-01270-5

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  • DOI: https://doi.org/10.1007/s42835-022-01270-5

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