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Article

Equivalent Impedance Calculation Method for Control Stability Assessment in HVDC Grids

1
Institute of High Voltage Equipment and Grids, Digitalization and Energy Economics, RWTH Aachen University, Templergraben 55, 52062 Aachen, Germany
2
E.ON Energy Research Center, Institute for Automation of Complex Power Systems, RWTH Aachen University, Mathieustraße 10, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Mario Marchesoni
Energies 2021, 14(21), 6899; https://doi.org/10.3390/en14216899
Received: 10 September 2021 / Revised: 14 October 2021 / Accepted: 19 October 2021 / Published: 21 October 2021
(This article belongs to the Special Issue Small-Signal Modeling and Stability of Power Converter Systems)
A major challenge in the development of multi-vendor HVDC networks are converter control interactions. While recent publications have reported interoperability issues such as persistent oscillations for first multi-vendor HVDC setups with AC-side coupling, multi-terminal HVDC networks are expected to face similar challenges. To investigate DC-side control interactions and mitigate possible interoperability issues, several methods based on the converters’ and DC network’s impedances have been proposed in literature. For DC network’s impedance modelling, most methods require detailed knowledge of all converters’ design and controls. However, in multi-vendor HVDC networks, converter control parameters are not expected to be shared due to proprietary reasons. Therefore, to facilitate impedance-based stability analyses in multi-vendor MTDC networks, methods that do not require the disclosure of the existing converter controls are needed. Here, detailed impedance measurements can be applied; however, they are time-consuming and require new measurement for a single configuration change. This paper proposes an equivalent impedance calculation method suitable for multi-vendor DC networks, which for available black-box models or converter impedance characteristics can be modularly applied for various network configurations, including different control settings and operating points, while significantly reducing the required time for obtaining an equivalent DC network impedance. View Full-Text
Keywords: converter-driven stability; MTDC Interoperability; multi-vendor MTDC networks; impedance calculation converter-driven stability; MTDC Interoperability; multi-vendor MTDC networks; impedance calculation
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MDPI and ACS Style

Loku, F.; Düllmann, P.; Brantl, C.; Monti, A. Equivalent Impedance Calculation Method for Control Stability Assessment in HVDC Grids. Energies 2021, 14, 6899. https://doi.org/10.3390/en14216899

AMA Style

Loku F, Düllmann P, Brantl C, Monti A. Equivalent Impedance Calculation Method for Control Stability Assessment in HVDC Grids. Energies. 2021; 14(21):6899. https://doi.org/10.3390/en14216899

Chicago/Turabian Style

Loku, Fisnik, Patrick Düllmann, Christina Brantl, and Antonello Monti. 2021. "Equivalent Impedance Calculation Method for Control Stability Assessment in HVDC Grids" Energies 14, no. 21: 6899. https://doi.org/10.3390/en14216899

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