The invention provides a direct characteristic control based novel double-fed
induction motor control technology, comprising the following steps: 1, giving a
voltage equation with regards to the alpha axis and beta axis of a
stator of a double-fed
induction motor under a stationary frame; 2, based on the
voltage equation given in the step 1 and with the currents of the alpha axis and beta axis of the
stator and flux linkages of the alpha axis and beta axis of a rotor as state variables, putting forward a corresponding state equation observer; 3, designing a sliding mode variable structure
observer based on the step 2 so as to observe the currents of the alpha axis and beta axis of the
stator and the flux linkages of the alpha axis and beta axis of the rotor at the current state; 4, carrying out
discretization based on the state equation put forward in the step 2, thus obtaining a prediction
control equation, namely predicting the currents of the alpha axis and beta axis of the stator and the flux linkages of the alpha axis and beta axis of the rotor at next time; and 5, using the predicted currents of the alpha axis and beta axis of the stator and currents of the d axis and q axis of the stator, calculated according to a given torque and a given
rotor flux linkage together to solve a
characteristic equation to obtain the voltages of the alpha axis and beta axis of the stator and sending the voltages to SVPWM. The direct characteristic control based novel double-fed
induction motor control technology can be applied to the field of
wind power generation and the like.