Improving the transition capability of the low-voltage wind turbine in the sub-synchronous state using a fuzzy controller

Abstract

The main problem of wind turbines is associated with induction generators in their power supply during short circuits in the grid. In this research, a new method is presented for the uninterrupted operation of a wind turbine equipped with an induction generator fed on both sides of feeding during network errors. Wind farms equipped with a doubly-fed induction generator (DFIG) require two abilities to allow system operators to increase proficiency. These capabilities include fault ride-through and synchronization of output force fluctuations, especially when these generators generate significant electrical power. A MATLAB® software environment has been used to evaluate and improve the performance of these turbines. A fuzzy complement (FC) controller is used to improve the performance of the DFIG. The results demonstrate that this controller limits the operation of the turbine current and voltage in the short-circuit mode well. Regarding results obtained from comparing two different modes, it can be said that ripple is 4% in the FC mode, while this parameter is equal to 10% for the proportional-integral controller.