SENSORLESS CONTROL OF AN PMSM DRIVE WITH DIRECT TORQUE CONTROL USING FEEDBACK LINEARIZATION AND INSTANTANEOUS REACTIVE POWER

摘要

Disclosed are a senseless direct torque control apparatus and method for a permanent magnet synchronous motor (PMSM) using feedback linearization and instantaneous reactive power. The senseless direct torque control apparatus for a PMSM comprises an input unit receiving actual current measurements for an A phase and a B phase of an inverter, and a control unit, wherein the control unit includes: an instantaneous reactive power unit which calculates current estimates based on the received actual current measurements, calculates instantaneous reactive power of the received actual currents, and calculates instantaneous reactive power of the current estimates to estimate positional information of a rotor; a first feedback linearization unit which calculates a linearized torque command and a linearized flux command from a torque estimate and a flux estimate among the positional information of the rotor, using proportional integral (PI) control; a second feedback linearization unit which calculates a voltage estimate using feedback linearization based on the calculated torque command and flux command ; a voltage calculation unit which calculates a converter voltage based on the voltage estimate; and a pulse width modulation (PWM) control unit which performs direct torque control using PWM based on the calculated converter voltage.