Voltage drop control is the main low voltage ride-through(LVRT)method for MMC-HVDC system connected wind farms

but it often causes wind farm overcurrent during transient state

which will not only increase the electric stress of wind turbine but also endanger the safe operation of MMC stations. In order to improve the transient characteristics and LVRT capabilities of the system

the LVRT process of MMC-HVDC systems connected DFIG-based wind farms is analyzed in detail

and an auxiliary power reduction control strategy is proposed for wind farms. The impacts of the controller parameters variations on power reduction rates and dynamic behaviors of DC voltage of MMC are also analyzed. Finally

case studies have conducted to verify the effectiveness of proposed schemes.