1. De Doncker, R., Diven, D., Kheraluwala, M.: A three phase soft-switching high-power density dc/dc converter for high-power applications. IEEE Trans. Power Electron. 27(1), 63–73 (1991)
2. Liu, R.H., Yang, J.G., Jia, Y.Y.: Engineering applications of DC transformer in medium-voltage DC distribution network. Autom. Electr. Power Syst. 43(23), 131–143 (2019)
3. Kamarposhti, M.A., Shokouhandeh, H., Alipur, M.: Optimal designing of fuzzy-PID controller in the load-frequency control loop of hydro-thermal power system connected to wind farm by HVDC lines. IEEE Access. 10, 63812–63822 (2022)
4. Kamarposhti, M.A.: Optimal control of islanded micro grid using particle swarm optimization algorithm. Int. J. Ind. Electron. Control Optim. 1(1), 53–60 (2018)
5. Li, Z.X., Gao, F.Q., Zhao, C.: Research review of power electronic transformer technology. Proc. CSEE 38(5), 1274–1289 (2018)