The University of British Columbia

This paper presents a voltage control methodology that provides a doubly-fed induction generator (DFIG)-based wind farm with the capability to provide voltage regulation. The controller manipulates dynamically the reactive power from the voltage source converter (VSC) to control the voltage at a specified location. Since a proportional-plus-integral (PI) controller is popularly used in power systems, it is designed in this paper. In wind power generation systems, since operating conditions are changing continually by wind speed fluctuations and load changes, a robust control mechanism is necessary. Thus, a PI controller is designed by the Nyquist constraint design technique for the robustness. The proposed voltage control methodology is demonstrated on a candidate DFIG-based wind farm site on Vancouver Island, British Columbia, Canada.