Speed sensorless control method of doubly-fed motor for variable-speed pumping and storage system

Abstract

The invention relates to a speed sensorless control method of a doubly-fed motor for a variable-speed pumping and storage system, which can be applied to the technical field of electric power. The method comprises the steps of performing parameter online identification on the doubly-fed motor, and outputting stator resistance, stator inductance, rotor resistance, rotor inductance and mutual inductance after identification; establishing a rotor flux linkage reference model and a rotor flux linkage adaptive model according to the identified stator resistance, stator inductance, rotor resistance, rotor inductance and mutual inductance, and observing a stator flux linkage angle and a rotor position angle through the rotor flux linkage reference model and the rotor flux linkage adaptive model; performing vector control on the stator flux linkage angle and the rotor position angle, and outputting a driving signal; the driving signal is used for controlling the doubly-fed motor. By adopting the method, the control precision of the doubly-fed motor can be improved.

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