Direct feedback control of CBDFM based on rotor field oriented

Aimed at the high-order, strong-coupling characters of the cascaded brushless doubly-fed machine, a new control strategy, direct feedback control based on rotor field oriented, is first proposed. The influence that power machine brings to control machine is considered as disturbance. According to feedback control´s basic principle, the observed control machine flux as well as the total torque is compared with command values. The errors between them provide control variables to control flux and torque effectively. This method avoids solving complex nonlinear equation and depends less on machine parameters.