Patent ID: 6741059
Filing Date: 2004-05-25
Classification: H02P

Abstract:
An apparatus for controlling the torque and power factor of a doubly fed machine using direct torque control, comprising:(a) means for calculating the estimated torque of said machine and a desired rotor flux command &PSgr;r_ref; (b) means for calculating the actual rotor flux &PSgr;r and converting said actual rotor flux from the stator reference frame to the rotor reference frame by multiplying &PSgr;r by eâˆ’j&thgr;m; and (c) means for determining a torque error from said estimated torque and a reference torque, and a flux error from said desired rotor flux command and said actual rotor flux converted to the rotor reference frame, said determining means selecting an inverter voltage vector from said torque error and said flux error.