DC fault current limiters can rapidly restrict the rise of fault currents,but attention needs to be paid to their dynamic current-limiting characteristics during fault impact.To address this,a study on the fault impact char-acteristics of a resistive-type current limiter is conducted.Firstly,mathematical expressions for the DC voltage and the withstandable fault current before and after the limiter is connected are theoretically analyzed and derived.Sub-sequently,a high-current DC impact platform is established,and a laboratory prototype of the current limiter is de-veloped.A limiter model is built on the MATLAB/Simulink platform to conduct simulation analysis of the impact characteristics.Finally,high-current impact tests are performed on the resistive-type current limiters with single-coil and multi-coil parallel structures.Simulation and experimental results indicate that with increasing fault im-pact,the limiters'resistance rises more rapidly and to a greater extent after reaching the critical limits,resulting in a more effective current-limiting performance.Additionally,at lower impact voltages,the current-limiting resistance exhibits a rapid rise followed by a decrease trend.
VSC-HVDCfault current limitershort circuit faultquenching resistancefault impact
国家科技期刊平台
NSTL
维普
万方数据
