Optimal operation of multi terminal HVDC links connected to offshore wind farms

This paper investigates the optimal operation of Multiterminal High Voltage Direct Current (MTDC) systems connected to large offshore wind farms. A Recurrent Droop Control Method (RDCM) is proposed as an efficient control system for MTDC systems. The proposed RDCM can minimize the losses as well as apply any desired power flow scenarios considering operational constraints. It gathers the information of wind farms via Supervisory Control and Data Acquisition (SCADA) system and solves a Nonlinear Programing (NLP) problem to apply updated droop gains to onshore grid side converters by means of a fast communication system. Although the proposed RDCM is applicable to any MTDC system, it is only applied to Wind Farms Ring Topology (WFRT) which is possible candidate for MTDC systems. The simulations results show the effectiveness of the proposed RDCM.