DFIG model considering turbine mechanical limitations for frequency response control studies

Abstract

This paper presents a low-order model to study the frequency response capability of DFIG-based wind parks with primary droop and synthetic inertia controls, considering the physical limits of shaft speed, torques and blade pitch angle. The model takes as inputs: the turbine's spinning reserve margin; the wind speed; synthetic inertia constant; droop gain; and the wind penetration. The model can be used by both system operators and agents to: determine the frequency deviation of the power system at different wind penetrations; determine the available synthetic inertia of the wind park; and the effect of the control on the speed and torques of the wind turbines.