| Abstract: |
| The automatic reclosing strategy is an efective measure to improve the reliability of a distribution network. It can quickly clear instantaneous faults in the grid. The traditional transformer has proven to be reliable and robust during the reclosing process. However, the infuence of the reclosing process on the operational characteristics and reliability of solid-state transformers (SST) is still unclear. The reclosing action may generate a huge inrush current, resulting in shutdown and even damage of the SST. To address this problem, this paper proposes an inrush current suppression strategy. First, the operational performance of the SST under a reclosing process is discussed, and the inrush current generation mechanism is analyzed in detail. Then, considering the controllability of distributed generation (DG), a novel DG-supported inrush current suppression strategy is proposed. The suppression ability of the DG on inrush current in diferent initial conditions is analyzed. Finally, the efectiveness of the proposed strategy is verifed by simulation and experiment. These show that the proposed strategy can help to enhance the FRT capability of the SST, as well as support the SST to maintain continuous power supply and physical integrity during grid faults. |
| Key words: Solid-state transformer (SST), Reclosing process, Inrush current, Distribution generation (DG), Fault ridethrough (FRT) |
| DOI：10.1186/s41601-023-00326-6 |
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| Fund:This work was supported in part by the National Natural Science Foundation
of China (Key Program) under Grant 52130704 and in part by the National Natural Science Foundation of China (General Program) under Grant 5207707 |
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