ABSTRACT

Voltage Source Converter (VSC)-based Multiterminal High Voltage Direct Current (HVDC) Multi-Terminal DC (MTDC) has been considered to be a promising solution to integrate large Off-shore Wind Farms into the power grid. On the basis of a VSC-MTDC with four terminals, the simulation results on PSCAD/EMTDC have verified that the proposed control strategy can reduce power loss and DC voltage fluctuation. On the contrary, as the capacity of VSC has significantly increased to hundreds of MW, using Mutiterminal HVDC based on VSC to integrate Large-Scale Renewable Energy Generation to power system is considered a promising substitution for thermal power plants. Numerous studies have analyzed coordinated control strategies for VSC-MTDC. Most of them can be categorized into the master–slave control and the droop control. A four-terminal VSC-MTDC model was built in PSCAD/EMTD, and the simulated result demonstrated that the proposed control strategy can improve system performance and reduce power losses as well.