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

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

Roose, Thomas (Katholieke Universiteit Leuven)
Lekic, A. (TU Delft Intelligent Electrical Power Grids)
Alam, Mohammad Meraj (VITO-Energyville)
Beerten, Jef (Katholieke Universiteit Leuven)

2020-11-27

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.

DC resonances
HVDC grid
HVDC transmission
Impedance-based
Modular Multilevel Converter (MMC)
Power conversion
Power system dynamics
Power system stability
Resonant frequency
Stability analysis
Stability criteria
Topology

http://resolver.tudelft.nl/uuid:27d9f905-e8a1-4a2b-b8de-c8886c2e6a45

https://doi.org/10.1109/TPWRD.2020.3041176

1937-4208

IEEE Transactions on Power Delivery, 36 (2021) (6), 3414-3425

Institutional Repository

journal article

© 2020 Thomas Roose, A. Lekic, Mohammad Meraj Alam, Jef Beerten