Based on the Xinjiang grid structure in 2014 and to protect grid security and stability in the region which have high density wind power, DC ancillary generators and AC-DC sending grid. When bipole trip occurs in ±800 kV HVDC sending system, this paper provides control strategies considering power network in Xinjiang, wind power in Hami and DC ancillary units, and makes a coordination between control strategies and unbalanced cutting power. In this power grid, it analyzes the voltage effect under different stability control strategies. Research results show that when meeting the network security constraints, considering the control strategies that the wind power cutting in the 20% -80% and taking the large reactive power as priority target to cut, and retaining a part of DC power unit operation are conducive to stability. The control strategies to improve the UHVDC system operating stability and reduce voltage fluctuations on the impact of high density wind have important reference value.