Detailed Investigation and Performance Improvement of the Dynamic Behaviour of Grid-Connected DFIG-Based Wind Turbines with Fuzzy based LVRT Controller
Keywords:
Low voltage ride through (LVRT), Fuzzy based LVRT (FLVRT), Conventional Control Schemes (CCS).Abstract
This paper presents a comprehensive study of the fuzzy based LVRT of grid-connected DFIG-based wind
turbines. It provides a detailed investigation of the transient characteristics and the dynamic behaviour of DFIGs during
symmetrical and asymmetrical grid voltage sags. A detailed theoretical study supported by computer simulations is
provided. This paper also provides a new rotor-side control scheme for DFIG-based wind turbines to enhance its LVRT
capability during severe grid voltage sags. The proposed control strategy focuses on mitigating the rotor-side voltage
and current shock during abnormal grid conditions, without any additional cost or reliability issues. As a result, the
DFIG performance is improved and utility company standards are fulfilled. Computer simulations are used to verify the
expanded ride-through capability of the novel strategy and its effective performance compared to the conventional
control schemes