Grid-connected wind turbines are developing rapidly nowadays, and thus their interactions with the power grid are becoming increasingly important. Grid-friendly wind turbines should possess stable output power, fast dynamic responses, and perfect fault-ride-through capability. This paper focuses on the low-voltage ride-through (LVRT) of a permanent-magnet synchronous generator (PMSG) wind turbine system equipped with fully rated neutral-point-clamped (NPC) converters. We propose a modified control strategy based on rotor-energy storage and the coordinated control of active and reactive power to meet grid interconnection standards. In addition, a dc chopper circuit works as a coordinated protection device for avoiding overspeed. The correctness and feasibility of the proposed control strategy are demonstrated through simulations. The large inertia link of the drive chain could be used to stabilize turbine operation under conditions of power dynamic mutation by taking advantage of its suitability for energy storage, which avoids the wind energy loss.
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