LAUSR

The dc fault current has a high amplitude and a fast rising speed, therefore with regard to the hybrid dc circuit breaker, it is hard to meet the requirement of a high breaking capacity while maintaining economically efficient. The SI-SFCL can prevent the speed of the fault current from rising too fast, and ensure the current remains under the interrupting capability of the dc circuit breaker, so the couse of the SI-SFCL and the dc circuit breaker is an effective solution for fault clearing in dc grids. In this paper, the current-limiting requirement of the DCCB is given, and a simplified equivalent circuit of the active SI-SFCL is proposed, based on which the matching between the electrical parameters of the active SI-SFCL and the dc circuit breaker is studied. Parameter constraint and the protection voltage range of the active SI-SFCL are given. Finally, the conclusion on the matching between the electrical parameters of the active SI-SFCL and the DCCB is verified by MATLAB/Simulink.