Aggregated control of VSC HVDC systems and offshore wind farms

This paper discusses the aggregated active power control in a Voltage Source Converter High Voltage Direct Current(VSC HVDC) system, interconnecting one offshore wind farm and two asynchronous onshore grids. Existing control strategies have all been developed for point-to-point connections and need a revision when an operation with more than two converters is considered. This paper introduces an aggregated system control, both for a set-up with two point-to-point connections and for a multi-terminal HVDC system. Simulation results in MATLAB/Simulink show that the aggregated system control is able to adequately control the power distribution from the wind farm to the two onshore grids at varying wind farm output.