Dynamic analysis of AC loss in HTS SMES integrated with DFIG during voltage disturbances using field-circuit interaction method

Improved fault ride-through (FRT) capability in doubly fed induction generator (DFIG) wind turbines during voltage disturbances is achieved by integrating superconducting magnetic energy storage (SMES). During power stability operations, SMES experiences dynamic currents that lead to AC losses, affecting the critical state of the high-temperature superconducting (HTS) coil. This article proposes a field-circuit interaction method to analyse dynamic AC losses for an SMES integrated with DFIG under voltage disturbances. In this system, a class D chopper-based SMES is connected to the DC link of the DFIG system and implemented using MATLAB, with an HTS coil model coupled through COMSOL Livelink. The performance of the SMES and AC loss of the superconducting coil is calculated during power stability operations of the DFIG. Additionally, an experimental study is conducted for the class D chopper, and its operation is studied.