Continuous DC node voltage control characteristic for multi-terminal and meshed HVDC grids

Worldwide multi-terminal or even meshed HVDC systems are expected to be a suitable solution for upcoming challenges within the energy transmission sector. During the last years several methods have been proposed to control such kind of HVDC systems with local DC node voltage control characteristics. These are all piecewise linear characteristics. This paper proposes a continuous control characteristic including guidelines for its parameterization in order to 1) represent existing method's proven advantages and 2) to avoid a critical stress of the AC grid surrounding the converter stations in case of DC voltage control actions.