DC Link Capacity Enhancement for MMC-based Distribution Link using Dynamic Voltage Operation

Conference paper (2023)

Authors

Robin van der Sande DC systems, Energy conversion & Storage - EEMCS
R.S. Deshmukh DC systems, Energy conversion & Storage - EEMCS
A. Shekhar DC systems, Energy conversion & Storage - EEMCS
P. Bauer DC systems, Energy conversion & Storage - EEMCS
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
Copyright: © 2023 Robin van der Sande, R.S. Deshmukh, A. Shekhar, P. Bauer
DOI: https://doi.org/10.23919/ICPE2023-ECCEAsia54778.2023.10213697
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Published Date

2023

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

When operating a modular multilevel converter (MMC), a margin appears between the arm voltage and sum capacitor voltage corresponding to the power dependent ripple. This margin can be used to enhance the DC link voltage and increase the transfer capacity of an MMC-based distribution link while keeping the submodule (SM) stresses fixed. Consequently, this dynamic enhancement in transfer capacity can be achieved with the same submodule switch and capacitor voltage ratings. Using an arm-level averaged simulation model of a 10MW MMC-based MVDC link, the enhancement concept is verified and shown to be beneficial to a practical link application. Besides, a dependency is discovered between the enhancement limit and the grid-injected reactive power, which defines the basis of the proposed control for dynamic enhanced operation.

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