A novel simplified modeling method based on R–Q curve of resistive type SFCL in power systems

Resistive type superconducting fault current limiter (R-SFCL) has always been a research hotspot. Due to its simple principle and structure, good current limiting effect and easy module, it has a promising prospect applied in power system. However, R-SFCL quenching is a complex process of multiple physical fields coupling, including current, magnetic field and temperature. In general, finite element software is used to accurately simulate the process of R-SFCL. In the simulation of complex power system, the coupling calculation method can increase the complexity, calculated amount and operation time of transient simulation, availability of which is low. The calculation method of fitting formula can't accurately reflect the change of resistance in the quenching process, which affects the accuracy of system simulation. According to experiments and simulations, it is found that once superconducting tape tends to completely quenching, the quenching resistance R of YBCO superconducting tape has a fixed relation with joule heat Q produced by quenching resistance when the refrigerating mode remains unchanged. Therefore a novel simplified modeling method based on R–Q curve of YBCO resistive type SFCL is proposed, which can be easily implemented in system simulation software such as MATLAB, PSCAD/EMTDC. This method is simple structure and based on experimental data which has the advantage of fast operation speed. The good simulation effect of the method is verified by quenching experiments.