Control of multiple VSC-HVDC converters within an offshore AC-hub

The offshore node will be a key component of a future European Supergrid. The offshore AC hub (or SuperNode) is presented as one possible topology of an offshore node. Tranche A is an area within Dogger Bank, which is one of the UK´s largest offshore wind development zones. It is a likely location of an offshore AC hub and therefore is used as a case study. Two strategies are presented for control of voltage, current and power within the offshore AC hub. The performance of each control strategy is compared under both planned and unplanned changes in operating conditions. Simulations are carried out using the SimPower toolbox of MATLAB Simulink. It is found that both control strategies are able to maintain satisfactory control of voltage, current and power. The communication requirements of each strategy are also briefly discussed.