Enhancing the Fault Ride-through Capability of a DFIG-WECS Using a High-Temperature Superconducting Coil

With the increase in doubly fed induction generator-based wind energy conversion systems (DFIG-WECS) worldwide, improving fault ride-through (FRT) capability of entire system has been given much attention. Enhancement FRT a DFIG-WECS is conventionally realized by employing flexible AC transmission device with proper control system. This paper presents non-conventional method for improvement DFIG-WECS, using high-temperature superconducting coil interfaced DC-link rotor and stator side converters through DC-chopper. A fractional-order proportional-integral (FOPI) controller utilized to regulate DC-chopper duty cycle order properly manage power flow between coil. Two optimization techniques, Harmony Search Grey Wolf Optimizer, are employed determine optimum size along parameters FOPI controller. The effectiveness two proposed techniques highlighted comparing their performance well-known particle swarm technique.