Interaction of droop control structures and its inherent effect on the power transfer limits in multi-terminal VSC-HVDC

Florian Thams, Robert Eriksson, Marta Molinas

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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
Title of host publicationProceedings of 2017 IEEE Power & Energy Society General Meeting
Number of pages1
Publication date2017
Pages1 pp.
ISBN (Print)9781538622124
Publication statusPublished - 2017
Event 2017 IEEE Power & Energy Society General Meeting - Chicago, United States
Duration: 16 Jul 201720 Jul 2017


Conference 2017 IEEE Power & Energy Society General Meeting
CountryUnited States
SeriesIeee Power and Energy Society General Meeting

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