Low Voltage Ride-Through of WECS Based on DFIG During a Balanced and Unbalanced Type-C Voltage Dip Using Crowbar Protection

Abstract

The primary issue with variable speed wind energy conversion systems (WECS) that utilize doubly-fed induction generators (DFIG) is that partial power converters are used and the generator is directly coupled to the grid, which has a significant impact on grid disturbances like symmetrical and asymmetrical voltage dips. Voltage dips can threaten the converter on the rotor side and even damage the rotor circuit. Therefore, wind turbines must be equipped with protection mechanisms to protect the rotor converter and intermediate circuit capacitors in the event of a fault. In recent years, the crowbar protection system has been the most common configuration in generator low-voltage circuits. The objective of this work is to enhance the reactive power- supported low-voltage ride transition (LVRT) in (WECS) based on (DFIG) equipped with a parallel crowbar attached to the rotor side converter with a fuzzy logic controller (FLC) and control of the RSC and GSC negative sequence during symmetric and unbalanced type-C voltage dips. Simulations were performed in MATLAB/Simulink environment to perform a performance analysis of a 2 MW DFIG-based three-blade wind turbine with and without crowbar protection. The results have also been compared to similar research. The results demonstrated that the suggested system is robust and applicable.