Stability Analysis of High-Frequency Interactions Between a Converter and HVDC Grid Resonances

Journal article (2020)

Authors

Thomas Roose Katholieke Universiteit Leuven
A. Lekić Intelligent Electrical Power Grids - EEMCS
Mohammad Meraj Alam VITO-Energyville
Jef Beerten Katholieke Universiteit Leuven
Research Group
Intelligent Electrical Power Grids (EEMCS) (TU Delft)
Copyright: © 2020 Thomas Roose, A. Lekić, Mohammad Meraj Alam, Jef Beerten
DOI: https://doi.org/10.1109/TPWRD.2020.3041176
Topology Power conversion HVDC transmission Stability analysis Modular Multilevel Converter (MMC) Stability criteria Resonant frequency Power system dynamics Power system stability DC resonances HVDC grid Impedance-based
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Published Date

27-11-2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Intelligent Electrical Power Grids

Abstract

This paper analyzes high-frequency interactions between a Modular Multilevel Converter (MMC) and High Voltage Direct Current (HVDC) grid resonances by studying their effect on the system stability. The recent appearance of converter-related instabilities due to high-frequency oscillations at the converter's ac side raises concerns about whether similar interactions can also take place at its dc side. To determine the risks imposed by such interactions within an HVDC grid, this paper assesses the impact of the MMC internal dynamics and dc system resonances on the stability using an analytical impedance-based method. The effect of fault current-limiting inductors, grid topology changes and transmission line length is investigated, indicating that these parameters considerably influence the electromagnetic characteristics of the HVDC grid and consequently the system stability. Furthermore, a sensitivity analysis of the MMC internal controller dynamics on the converter's non-passivity, causing the instability, is performed.