Explicit damping specification in PI controller design for desired control performance of wind power conversion system with permanent magnet generator

The unpredictable variations in the wind speed consistently require a significant endeavor to enhance the control performance of the wind power conversion system (WPCS). This paper aims to evaluate the performance of a permanent magnet generator-based WPCS making use of the vector control schemes where, the internal loop employs hysteresis current controller and the external loop employs proportional-integral (PI) controller. In order to devise a control system with most favorable closed-loop poles meant for desired control performance, the parameters of the PI controllers involved in the external speed and DC link voltage control loops have been designed incorporating explicit damping specification via pole-placement. The offline simulation results have been produced in MATLAB environment using Simulink to demonstrate the effectiveness of the proposed PI controller design. The offline simulation results are then validated through Typhoon HIL402 real-time hardware simulator. It has been verified that the vector control schemes incorporating the PI controller parameters as designed herein allows the WPCS to operate stably with desired control performance while extracting the peak power continually even under rapidly changing wind speeds.