With the continuous expansion of the wind farm, the different types of wind turbine, the different power compensation equipment, the wind power electric power grid structure is more complex, which leads to the problem of cluster wind farm voltage. In this paper, two 750kV region of a cluster of wind power base in Xinjiang province is analyzed, based on the actual operation of the wind farm, in accordance with two different types of constant speed and variable speed turbine, the reactive power compensation of the wind farm is carried out by using the method of grouping the shunt capacitor or SVC, the influence of different compensation measures on the voltage characteristics of 750kV and wind farm in the region is compared. By analyzing, verifying the reactive power compensation device of large scale wind power voltage is greatly improved. Based on the compensation effect and economic factors, the capacitor group is ensured as the positive measures in the region of stable operation of power grid.