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

• Published in: IEEE transactions on power delivery Vol. 26; no. 4; pp. 2476 - 2485
• Main Authors: Prieto-Araujo, E., Bianchi, F. D., Junyent-Ferre, A., Gomis-Bellmunt, O.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Convertors; Direct current; Direct current networks; Droop control; Electric potential; Electric power plants; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Exact sciences and technology; high-voltage direct current (HVDC); HVDC transmission; Methodology; multiterminal; Non classical power plants; Offshore; Offshore engineering; Offshore installations; Offshore structures; offshore wind power; Power conversion; Power networks and lines; Power system stability; Regulation and control; Voltage; Voltage control; Wind farms; Wind power generation; Wind power plants; Performance evaluation; Windfarm; Droop control; high-voltage direct current (HVDC); Control synthesis; offshore wind power; Steady state; Voltage source converter; Frequency response testing; Wind energy; multiterminal; High voltage; Direct current; High current; Multiterminal networks; HVDC systems; Inward current; Offshore platforms
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2011.2144625

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.