Fault Ride through Capability Enhancement of Grid-connected DFIG-based Wind Power Generation During Voltage Dips

Doubly-fed induction generator (DFIG)-based wind energy sources have undergone fast expansions worldwide which leads to challenges related to low voltage ride-through (LVRT) capability. Mitigating the problem related to dynamic voltage stability specifically voltage dip is essential to keep the wind generators connected to the grid during faults. This paper analyzes the impact of increasing wind power share and proposes a new control strategy to improve LVRT capability to allow higher penetration levels of wind power. The proposed control scheme of DFIG-based wind turbines uses static synchronous compensator and rotor over-speeding strategies. The effectiveness of the proposed LVRT capability is verified using the IEEE 39-bus test system. The dynamic simulation shows that an increase in wind power penetration level has deteriorated system stability, while implementation of the proposed scheme has resulted in improving the DFIG fault ride-through capability by decreasing voltage dip and rotor currents and thus, enhancing system stability.