Application of high temperature superconductor to improve the dynamic performance of WECS

Doubly Fed Induction Generators (DFIGs) are currently extensively used in variable speed wind power plants due to their superior advantages that include reduced converter rating, low cost, reduced losses, easy implementation of power factor correction schemes, variable speed operation and four quadrant active and reactive power control capabilities. On the other hand, DFIG sensitivity to grid disturbances, especially for voltage sags represents the main disadvantage of the equipment. In this paper, a high temperature superconductor (HTSC) is proposed to be integrated within the DFIG converters to improve the overall performance of a DFIG-based wind energy conversion system (WECS). A fuzzy logic (FL) to control the charging and discharging of the high temperature superconductor is introduced. Simulation results reveal the effectiveness of the proposed HTSC in improving the dynamic performance of WECS under study.