Abstract: In order to accurately reflect the grid-connected control performance of wind turbines and wind farms,and accelerate the development and verification of control strategies,a multi-controllers hardware-in-the-loop（CHIL）simulation method for wind farms based on real-time simulation system is proposed. In this paper,a CHIL wind farm real-time simulation platform is developed,including a wind farm power control system and 10 wind turbine main control PLCs,by building a detailed model of the wind farm and designing the data interaction mechanism between each part of the model and the actual controller. Based on the simulation platform,time delay in control link is analyzed and the simulation accuracy of the electromagnetic transient characteristics and the power control characteristics are verified. Furthermore,the primary frequency control with the consideration of loads impact on wind turbine is studied,which has been applied to a real wind farm.