Diode based HVDC link for the connection of large off-shore wind farms with self start capability

This paper includes a distributed control strategy for the joint control of wind turbines and a diode based HVDC link with black start capability. In spite of using a Line Commutated Rectifier, the presented technique allows for the black-start operation of the off-shore grid. Moreover, an adequate desing of wind turbine pitch and active power control during the connection procedure allows for reduced mechanical stress on the wind turbines. The proposed self start strategy allows for the wind farm to carry out initial energization of the HVDC-link. Validation of the proposed technique at rated power and at cut-in wind speed has been carried out considering a distributed model of the wind farm.