Voltage and frequency control of SG based wind farms with uncontrolled HVDC rectifier

The present paper introduces the study and validation of a voltage and frequency control technique of Synchronous Generator based off-shore wind farms connected with a line commutated HVDC link with an uncontrolled rectifier. The proposed control technique is based on the use of standard practice current control for the wind turbines and outer, slower loops for voltage and frequency control. The proposed control strategy allows for wind-farm connected and islanded operation while providing adequate fault ride-through operation. The proposed technique has been validated with PSCAD simulations of the complete system.