Combined Use of SFCL and SMES for Augmenting FRT Performance and Smoothing Output Power of PMSG Based Wind Turbine

Abstract

Concerning the integration of renewable energy in the power grid, some key technical issues should be given enough attention, such as the capability of fault ride through (FRT) and the smoothness of output power. In this paper, the combined use of a resistive-type superconducting fault current Iimiter (SFCL) and a superconducting magnetic energy storage (SMES) is proposed, and it is expected to improve the transient performance of a permanent magnet synchronous generator (PMSG) based wind turbine system under fault conditions. The SFCL is installed near the line side converter (LSC) of the wind turbine system, and its functions are to suppress the fault current and compensate the terminal voltage. The SMES is coupled to the wind turbine system’s DC-link, and it aims to alleviate the power difference between the generator side converter (GSC) and the LSC. Thus, the output power can be smoothed, and the DC-link overvoltage will be mitigated. Related theoretical modelling analysis is conducted, and further a detailed simulation model of 1.5 MW PMSG-based wind turbine integrated with the SFCL-SMES is built in MATLAB/SIMULINK. The simulations are performed to check the effects of the SFCL-SMES on handling the three-phase short-circuit. From the simulation results, the effectiveness of the proposed approach on augmenting the FRT capability and smoothing the power fluctuation of the PMSG can be well confirmed.