DC Voltage Droop Control Design for Multiterminal HVDC Systems Considering AC and DC Grid Dynamics


This paper focuses on the droop-based dc voltage control design for multiterminal VSC-HVDC grid systems, considering the ac and also the dc system dynamics. The droop control design relies on detailed linearized models of the entire multiterminal grid, together with the different system dynamics, like the dc grid, the ac grid, the ac association filters, and the converter inner controllers. Based mostly on the derived linear models, classical and trendy control techniques are applied to design the various controllers, together with a multivariable frequency analysis to design the grid voltage droop control. In combination with the droop control, a dc oscillation damping theme is proposed so as to improve system performance. The control design is validated through simulations of a 3-terminal system.

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