Fuzzy logic approach for inertial and frequency response from converter based wind power units

A fuzzy logic controller is proposed to perform the functions of supplementary inertial and frequency control in wind turbine generating units. Expert knowledge governing the performance of the proposed fuzzy logic approach for frequency support in this study is expressed by a set of fuzzy rules extracted from a common symmetrical rule table widely used in the literature. A sample multi-machine power system is used to evaluate the performance of the proposed fuzzy controller under system frequency drop perturbations. Time domain simulation results show that the proposed alternative can indeed improve the frequency nadir following grid frequency declines, as compared to the performance of a conventional inertial controller.