Abstract: In order to enhance the reliability of a generation system,battery energy storage system（BESS）is incorporated into a wind farm to constitute a hybrid wind/energy storage power station.Based on the Well-being theory,sequential Monte Carlo simulation technology is utilized to assess the reliability of the hybrid system,the probability of system integrity,of safety margin and of risk indices are obtained.Any incomplete charge-discharge cycle is forbidden,and two battery operation strategies are proposed to limit battery charge and discharge behavior.Simulation results on IEEE Roy Billinton test system（RBTS）demonstrate that incorporation of BESS can dramatically improve the reliability of generation system with wind farms;the optimized battery operation strategy mitigates the operation risk and improves the comfort of system operation;wind farms connected with suitable capacity of the battery can improve system economical performance and reliability.Finally,the results show that reliability indices based on the Well-being theory have an advantage on the reliability analysis of generation systems with BESS.