With the large-scale development of offshore wind power

the voltage source converter based high voltage direct current(VSC-HVDC)transmission system has received extensive attention in recent years. By introducing the AC voltage droop control

a coordinated multi-terminal grid-connection control strategy for a wind farm AC-dispersed at the sending end based on VSC-HVDC systems is proposed. Based on the traditional control strategy for the flexible HVDC transmission system

the DC voltage control of inverters on the grid side is retained to guarantee system power balance

while AC voltage droop control rather than the original constant-power control is designed for the rectifier on the wind farm side to achieve the advantage of communication-free and reasonable dynamic allocation. Simulation analysis shows that the control strategy proposed is not only able to achieve flexible automatic tracking of rated active power

but also has certain tolerance of load fluctuation and the function of DC/AC fault isolation. And when it comes to power supply for multi-terminal distribution networks by a wind farm AC-dispersed at the sending end

quick power reversal can be achieved if the wind farm is cut out of the system to ensure power supply reliability. And the system is capable of realizing rational allocation of dynamic power automatically among them according to rated ratio

providing effective solutions for coordinated operation of wind farm's decentralized integration into distribution networks. This work is supported by State Grid Corporation of China(No. 5211011400BT).