Impedance-based method for DC stability of VSC-HVDC system with VSG control

Chang Li, Yijia Cao, Yaqian Yang*, Lei Wang, Frede Blaabjerg, Tomislav Dragicevic

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

DC-side oscillation problems trouble the stable and secure operation of voltage source converter high voltage direct current (VSC-HVDC) systems. Therefore, it is of considerable significance to investigate the physical origins of these oscillations. Thus, this paper proposes an impedance-based method for VSC-HVDC system DC stability analysis. Differently, a new perspective for DC resonance interaction is introduced, which is judged by the interactive behavior of two subsystems impedances, namely converter impedance and DC network impedance. Also, the proposed method quantitatively estimates the damping of DC schemes of VSC-HVDC system. Based on the proposed method, it is found that the global stability of VSC-HVDC system can be guaranteed if and only if: 1) subsystems are passive and locally stable, 2) there is no resonance interaction between inductive impedance and capacitive impedance, and 3) damping of DC system is large enough. Moreover, another contribution is to apply the virtual synchronous generator (VSG) control technique in VSC-HVDC system to dampen DC-side oscillation caused by impedance interaction. Specifically, this VSG control enhances inertia and damping of VSC-HVDC system on DC-side. Finally, the feasibility of the proposed technique and the accuracy of the mathematical model are demonstrated through simulation and experimental results.
Original languageEnglish
Article number106975
JournalInternational Journal of Electrical Power and Energy Systems
Volume130
Number of pages8
ISSN0142-0615
DOIs
Publication statusPublished - 2021

Keywords

  • DC-side oscillation
  • Passive and locally stable
  • Interaction
  • VSG control
  • Inertia

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