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Methodology for Droop Control Dynamic Analysis of Multiterminal VSC-HVDC Grids for Offshore Wind Farms

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4 Author(s)
Prieto-Araujo, E. ; Dept. d''Eng. Electr., Univ. Politec. de Catalunya, Barcelona, Spain ; Bianchi, F.D. ; Junyent-Ferré, A. ; Gomis-Bellmunt, O.

This paper addresses the control of multiterminal voltage-source converters at high-voltage direct current in the context of offshore wind farms. Droop control is commonly used to regulate the dc voltage in this kind of grid, and droop parameters are selected on the basis of steady-state analyses. Here, a control design methodology is proposed based on the frequency-response analysis. This methodology provides a criterion to select the droop gains, taking into account the performance specifications [i.e., the desired voltage errors and the maximum control inputs (currents)]. The application of the methodology is illustrated with a four-terminal grid.

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Power Delivery, IEEE Transactions on  (Volume:26 ,  Issue: 4 )