Off-shore wind farm grid connection using a novel diode-rectifier and VSC-inverter based HVDC transmission link

This paper carries out a technical feasibility study on the use of HVDC diode based rectifiers for the connection of large off-shore wind farms, together with an on-shore voltage source converter. An integrated control technique for the overall system is developed and validated by means of PSCAD simulation of the distributed wind farm together with the complete HVDC link. The presented results show an adequate distributed control of the off-shore ac-grid voltage and frequency. Moreover, the proposed system shows good behavior during solid three phase faults at the on-shore connection point. It is concluded that the proposed topology is a technically feasible solution for the connection of large off-shore wind farms.