The invention provides a wind-power energy conversion system with redundant energy storage, and an application mode and a control method thereof. The system comprises a hub, a variable pitch system, blades, a base, a generator, a converter, a redundant energy storage battery, a yaw system and a tower frame, and is characterized in that three blades are arranged on the hub, and the variable pitch system is arranged in the hub and is connected with the blades; the top of the tower frame is connected with the base through the yaw system, and the generator on the base is connected with the hub; and the generator is further connected with the converter and the redundant energy storage battery. The wind-power energy conversion system with redundant energy storage, provided by the invention, has the advantages of high energy density, small floor space, high efficiency, short construction period and strong site applicability.