Control strategy for wind generation units to mitigate voltage sags in distribution systems

The short duration voltage variations, such as voltage sags and swells, are typical disturbances that significantly affect the power quality in distribution systems. The typical devices for voltage support and regulation, distributed along the distribution networks, are generally not capable of mitigating short duration voltage variations. However, distributed generation units connected to the distribution systems, when associated with suitable control strategies, can be able to mitigate short duration voltage variations. In this context, this paper proposes a control strategy for wind generation units based on permanent magnet synchronous generator to mitigate voltage sags in distribution systems. The proposed control strategy takes into account the transient overload capability of the wind generation unit.