**6. Conclusions**

This paper proposes a local detection and local action strategy for DC grids. Compared with the conventional relay protection strategy, the proposed strategy has the following advantages:


**Author Contributions:** Conceptualization, Z.Z. and Z.X.; methodology, Z.X.; software, Z.Z.; validation, J.Y.; formal analysis, J.Y.; investigation, J.Y.; resources, Z.X.; data curation, Z.X.; writing—original draft preparation, J.Y.; writing—review and editing, Z.Z.; visualization, Z.Z.; supervision, Z.X.; project administration, Z.X.; funding acquisition, Z.X. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Headquarters Research Projects of State Grid Corporation of China, gran<sup>t</sup> number SGJSJY00GHJS1900028.

**Conflicts of Interest:** The authors declare no conflict of interest.
