Abstract: A novel DC current-voltage droop control method was proposed for a hybrid high-voltage direct

current（HVDC）system composed of a voltage source converter（VSC）and a line-commutated converter（LCC）.

The DC voltage droop control was used to reduce AC voltage fluctuation on the inverter side，so as to achieve the

goal of connecting offshore wind farms to the weak power grid using HVDC system without the need for continuous

reactive power compensation equipment. In addition，the optimal droop coefficient calculation method was

proposed to maintain the stability of AC voltage to wind power fluctuation. In order to evaluate the stability of the

method，a small-signal state space model of the system was established and root locus analysis was performed.

Finally，PSCAD and Matlab were used for simulation analysis. The results show that the proposed method can

successfully realize the safe and stable connection between offshore wind energy and weak power grid without

additional facilities，and theAC voltage can be kept at a nearly constant level when the wind fluctuates.

      Key words: frequency；DC voltage stability；power distribution；virtual inertia；virtual regulator gain