## 6 Conclusions  
This paper presented a simulation and experimental evaluation of a method for converting a single-phase 220 V AC input to three-phase 380 V AC using power semiconductor devices, specifically SiC-MOSFETs. The proposed system topology consists of a single-phase half-bridge AC-DC converter followed by a three-phase full-bridge inverter. The 220 V input is converted to 750 V DC and then inverted to produce a 380 V three-phase AC output.  
To reflect the characteristics of real-world PDSs, which are more complex than PTSs, various load conditions were considered, including unbalanced loads, nonlinear loads, and motor loads. The experimental results verified that single-phase household loads operated stably, with normal current and voltage waveforms. For nonlinear loads, although the current waveform was distorted due to load characteristics, the output voltage remained stable. In the case of motor loads, the STPC functioned normally when the system capacity was set appropriately to account for the inrush current.  
Considering the nature of PDSs--where multiple diverse loads are connected--it was confirmed that converting single-phase AC to DC, and then from DC back to three-phase AC using power semiconductors, is an effective approach for application in low-voltage distribution networks. Moreover, by utilizing an STPC, it is possible to reduce the need for additional line construction, transformer installation, and pole reinforcement, as outlined in Table 7. Thus, an STPC is a promising solution for supplying a three-phase voltage efficiently to low-voltage consumers.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Comparison Criteria** & **Conventional Method** & **Proposed STPC** \\ \hline Installation Method & Line extension + transformer installation & Modular installation at load site \\ Conversion Efficiency & High (typically \textgreater{}98\%) & Moderate (\textgreater{}96\%) \\ Voltage Regulation & Passive, no regulation capability & Stable regulation of the output voltage \\ Maintenance Complexity & Low (simple structure) & Moderate (semiconductor components, cooling) \\ \hline \hline \end{tabular}
\end{table}
Table 7: Comparison between conventional method and proposed STPC.  
**Author Contributions:** Conceptualization, B.S., C.K., H.L. and S.C.; methodology, B.S.; software, B.S.; validation, B.S. and C.K.; formal analysis, B.S., C.K. and H.L.; investigation, B.S., C.K. and H.L.; resources, B.S., C.K. and H.L.; data curation, B.S., C.K. and H.L.; writing--original draft preparation, B.S.; writing--review and editing, B.S. and S.C.; visualization, B.S.; supervision, S.C.; project administration, B.S.; funding acquisition, B.S. and S.C. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This paper was supported by the Korea Electric Power Research Institute (KEPRI) grant funded by the Korea Electric Power Corporation (KEPCO) (R23 DA01).  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The raw data supporting the conclusions of this article will be made available by the authors on request.  
**Conflicts of Interest:** The authors declare no conflicts of interest.