MPC-based DC-link voltage control for enhanced high-voltage ride-through of offshore DFIG wind turbine

To deal with the DC-link overvoltage during high-voltage ride-through (HVRT) of wind turbine, a coordinated voltage control (CDVC) scheme is proposed for enhancing HVRT performance offshore doubly-fed induction generator (DFIG) turbines equipped supercapacitor energy storage system (SESS). This formulated as two-stage problem depending on depth grid swell, which can prevent damaging converter resulting from insufficient reactive support in first stage, and achieve efficient under various magnitude timescale swell. In considering dynamic behavior DFIG HVRT, voltage-dependent current (VRCC) designed to regulate reference turbine. The stage aims supply fast without DC chopper. second once exceeds predefined threshold, SESS turbine operation implemented using model predictive (MPC), aiming excessive active power by tracking stage. validated PSCAD/EMTDC operational scenarios. Case study results show that effectively mitigate enhance capability asymmetrical symmetrical swells.