Grid-connection characteristics of renewable energy, such as wind farm (WF) and PV plants often have the negative influence on the security and stability of power system. To smooth the active power, energy storage (ES) system was presented. The model presented of wind/photovoltaic/energy storage (W/PV/ES) hybrid station was simulated, and the grid-connection characteristics of W/PV/ES hybrid station were analyzed in Dig SILENT Power Factory. Simulation results show that it is positive and effective for ES to smooth the output fluctuation, and to improve the controllability of active power. Moreover, the electric power quality can be improved and the capacity of low voltage ride through (LVRT) can be raised for renewable energy station.