Control device for doubly-fed induction generator in which feedback linearization method is embedded

摘要

The present invention relates to a control device for a doubly-fed induction generator in which a feedback linearization method is enabled, in more detail, a control device for a doubly-fed induction generator which can implement an LVRT (Low Voltage Ride-Through) function by improving a DC link voltage control performance and an output control performance even under unbalanced voltage, such as a momentary power failure, by controlling a positive sequency component and a negative sequency components, which have non-linear characteristics, to be linearized while controlling the positive sequency component and the negative sequency component of the current of a rotor in a doubly-fed induction generator, respectively, for a d-axis and a q-axis. The present invention provides a control device for a doubly-fed induction generator in which a feedback linearization method is embedded, including a current control device for a doubly-fed induction generator controlled by a power conversion device composed of a system-side converter having an AC-DC conversion function and a generator-side converter having a DC-AC conversion function, is characterized in that the control device divides and measures positive sequency components and negative sequency components from stator voltage and current, rotor voltage and current, and signals of stator magnetic flux and rotor magnetic flux of the doubly-fed induction generator, divides the rotor current into four signals by dividing d-axial current and q-axial current from the positive sequency component and the negative sequency component of the rotor current, and makes a positive sequency component controller and a negative sequency component controller for the rotor current separately control the four signals of the rotor current, using the measured value, in which the positive sequency component controller and the negative sequency controller perform current input-output control, which is linearized by a feedback linearization method, for the d-axial current and the q-axial current.