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

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 con...

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Bibliographic Details
Published inIEEE transactions on power delivery Vol. 36; no. 6; pp. 3414 - 3425
Main Authors Roose, Thomas, Lekic, Aleksandra, Alam, Mohammad Meraj, Beerten, Jef
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Control stability
Converters
DC resonances
Direct current
Dynamic stability
Electric power transmission
Electromagnetic properties
Frequency analysis
HVDC grid
HVDC transmission
impedance-based
Inductors
modular multilevel converter (MMC)
Power conversion
Power system dynamics
Power system stability
Resonance
Resonant frequency
Sensitivity analysis
Stability analysis
Stability criteria
Systems stability
Topology
Transmission lines
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Summary: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.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2020.3041176