DC Admittance Model of VSCs for Stability Studies in VSC-HVDC Systems

Joaquín Pedra (), Luis Sainz and Lluís Monjo
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Joaquín Pedra: Department of Electrical Engineering (ETSEIB—UPC), Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain
Luis Sainz: Department of Electrical Engineering (ETSEIB—UPC), Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain
Lluís Monjo: Department of Electrical Engineering (EPSEVG—UPC), Universitat Politècnica de Catalunya, Av. Victor Balaguer s/n, 08800 Vilanova i La Geltrú, Spain

Energies, 2023, vol. 16, issue 14, 1-17

Abstract: High-voltage direct current (HVDC) systems linked to AC grids with converters are promising energy transmission systems. These systems present complex AC- and DC-side dynamic interactions. Impedance-based stability studies have recently been proposed to assess DC-side dynamics from DC-side characterization of voltage source converters (VSCs) considering AC-side dynamics. However, the existing approaches used for stability studies in VSC-HVDC systems do not completely model VSCs because they do not consider together the VSC delay, the grid voltage feedforward filter, and all the d - and q -reference current controls. Moreover, these approaches are analytically characterized from dq -real space vectors (less related to circuit theory than dq -complex space vectors), and some work with simple AC grids. The main contribution of this paper is a detailed and complete DC admittance model of VSCs from dq -complex space vectors, which considers the VSC delay, feedforward filter, and d - and q -reference current controls, and also a general AC grid. The proposed model can be used for DC-side stability studies in VSC-HVDC systems considering AC grid dynamics. The capabilities and drawbacks of impedance-based stability methods for DC-side stability assessment were analyzed, and the positive-net-damping criterion was validated as a robust approach. The model was validated by PSCAD/EMTDC simulations and applied to a stability study in a VSC-HVDC system.

Keywords: impedance modeling; voltage source converters; HVDC transmission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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