Most VSC-HVDC controls fix DC power at one VSC station, and fix DC voltage at the other. This paper proposes a power-voltage hybrid control which enables one VSC station to control both DC power and voltage simultaneously. By applying the hybrid control to both end of VSC-HVDC, the interconnected AC systems can mutually support each other during frequency deviation, and the VSC’s stability is also enhanced for low short-circuit ratio operation. Stability and effectiveness of the control is verified through RTDS simulations.
T. Lan, J. Xu, S. Liao, R. Chen, Y. Sun and X. Tang, "Simultaneously Controlling DC Power and Voltage with One Station of VSC-HVDC," 2020 IEEE Power & Energy Society General Meeting (PESGM), Montreal, QC, 2020, pp. 1-5, doi: 10.1109/PESGM41954.2020.9281915.
KEYWORDS: VSC-HVDC, hybrid control, frequency regulation, short-circuit ratio