The feasibility of application of wind-photovoltaic-energy storage (W-PV-ES) hybrid power generation technology in the station power system at 500 kV substation was analyzed and different schemes were designed. At present, the W-PV-ES hybrid technology is not suitable for the backup power system but can be used in the emergency power system. The W-PV-ES emergency power system can make full use of the nature energy source, improve the reliability of station power system, as well as supply power to the key equipments when all other power is lost.