A novel wind power system was proposed, which was composed of a generator, an auxiliary motor, a planetary gear and a wind turbine. The generator was connected to the sun wheel, while auxiliary motor was connected to the ring gear, and the shaft of the wind turbine was connected to the planetary carrier. The working mode and power flow about this type of structure in different working conditions were presented, and a novel speed-torque mode control strategy in all wind conditions was proposed. The generator...