The application of doubly fed vector control strategy in pump motor

In this paper, a new variable speed system applied in pump motor is proposed. The mathematical model of wound-rotor asynchronous motor under M-T coordinate system is deduced, and control strategy of doubly fed motor excitation based on stator flux oriented vector control technology and power relationship at three operating states are demonstrated. The satisfactory experimental results are attained when applying this strategy in inverter connecting bump motor rotor and power grid.