A novel voltage arc suppression method for single-phase grounding fault in distribution network based on power router

Abstract

The power-electronized distribution network is the trend with the emergence of widespread adoptions of converters, sparking innovative opportunities for investigating arc suppression. As a future alternative low-frequency transformer, the Power Router (PR) also needs grounding, which can realize arc suppression with well design. Therefore, this paper introduces a novel arc suppression technique for single-phase grounding (SPG) faults in distribution networks directly connected with a PR. Firstly, the distribution network connected with the PR is presented, where the PR operates with grounding in the medium-voltage DC side. Then, the principle of flexible voltage arc suppression through the PR is analyzed, considering the power transfer capability and the impact on circulating current. The multivariable decoupling control under the dq0 synchronous rotating frame (SRF) is applied to regulate the zero-sequence voltage, achieving active arc suppression. Furthermore, the article considers various fault conditions and different system-to-ground damping rates. Finally, the simulation results validate the flexibility and effectiveness of the proposed arc suppression method.