Interaction of Droop Control Structures and its Inherent Effect on the Power Transfer Limits in Multi-terminal VSC-HVDC

Florian Thams, Robert Eriksson, M. Molinas

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Abstract

Future multi-terminal HVDC systems are expected to utilize dc voltage droop controllers and several control structures have been proposed in literature. This paper proposes a methodology to analyse the impact of various types of droop control structures using small-signal stability analysis considering all possible combinations of droop gains. The different control structures are evaluated by the active power transfer capability as a function of the droop gains, considering various possible stability margins. This reveals the flexibility and robustness against active power flow variations, due to disturbances for all the implementations. A case study analyzing a three terminal HVDC VSC-based grid with eight different kinds of droop control schemes points out that three control structures outperform the remaining ones. Additionally, a multi-vendor case is considered where the most beneficial combinations of control structures has been combined in order to find the best performing combination.
Original languageEnglish
JournalI E E E Transactions on Power Delivery
Volume32
Issue number1
Pages (from-to)182 - 192
ISSN0885-8977
DOIs
Publication statusPublished - 2016

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Keywords

  • Power system stability
  • Power transmission
  • Stability
  • HVDC transmission
  • AC-DC power converters
  • Stability analysis
  • Control system analysis
  • State-space methods

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