VPI-based Control Strategy for a Transformerless MMC-HVDC System Under Unbalanced Grid Conditions

VPI-based Control Strategy for a Transformerless MMC-HVDC System Under Unbalanced Grid Conditions

This paper introduces a control method for a transformerless MMC-HVDC system. The proposed method can effectively control the grid currents of the MMC-HVDC system under unbalanced grid conditions such as a single line-to-ground fault. The proposed method controls the currents of the positive sequenc...

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Veröffentlicht in:Journal of electrical engineering & technology 2018, Vol.13 (6), p.2319-2328
Hauptverfasser: Kim, Si-Hwan, Kim, June-Sung, Kim, Rae-Young, Cho, Jin-Tae, Kim, Seok-Woong
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container_issue 6
container_start_page 2319
container_title Journal of electrical engineering & technology
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creator Kim, Si-Hwan
Kim, June-Sung
Kim, Rae-Young
Cho, Jin-Tae
Kim, Seok-Woong
description This paper introduces a control method for a transformerless MMC-HVDC system. The proposed method can effectively control the grid currents of the MMC-HVDC system under unbalanced grid conditions such as a single line-to-ground fault. The proposed method controls the currents of the positive sequence component and the negative sequence component without separating algorithms. Therefore, complicated calculations for extracting the positive sequence and the negative sequence component are not required. In addition, a control method to regulate a zero sequence component current under unbalanced grid conditions in the transformerless MMC-HVDC system is also proposed. The validity of the proposed method is verified through PSCAD/EMTDC simulation.
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title VPI-based Control Strategy for a Transformerless MMC-HVDC System Under Unbalanced Grid Conditions
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