B.A. Avdeev1, S.G. Chernyi2, A.V. Degtyarev3, B.G. Vetrov4

1,2 Kherson State Technical University (Henichesk, Russia)

2–4 Saint Petersburg State Marine Technical University (St. Petersburg, Russia)

1dirigeant@mail.ru, 2sergiiblack@gmail.com, 3captainandrey@gmail.com

The development of intelligent power supply networks and the increasing share of distributed energy sources, together with rapidly varying loads (including charging infrastructure), require greater flexibility in power distribution and maintaining power quality for end users. A promising solution is a digital substation based on a solid-state transformer (SST); however, its performance in transient operating conditions is largely determined by the capability for bidirectional power conversion and by the control system of the power conversion stages. The objective of this work is to study the operation of a digital substation within intelligent power supply system’s when switching the supply from one power source to another with a lower voltage level. The substation is implemented using a solid-state transformer (SST) consisting of a rectifier, a dual active bridge (DAB), and an inverter. It is shown that the DAB, as the core element of the SST, enables bidirectional power transfer, while power regulation is implemented by varying the phase shift using a PI controller. A control block diagram and waveforms for forward and reverse power transfer are presented. Based on simulation results, the impact of input-voltage sags and load changes on SST output characteristics is analyzed; tables of output voltage, output current, and output power are provided, along with an estimate of the relative power error. Limitations related to the depth of input-voltage sag and requirements for coordinating control loops during joint operation of the grid and a battery source are noted. The results can be used to justify the application of SSTs in digital substations of intelligent networks, to select source architectures, and to tune control parameters in order to ensure stable power transfer and the required power quality under transient conditions.

Avdeev B.A., Chernyi S.G., Degtyarev A.V., Vetrov B.G. Enhancing the functionality of intelligent power supply networks using solid-state transformers. Electromagnetic waves and electronic systems. 2026. V. 31. № 2. P. 36−45. DOI: https://doi.org/10.18127/ j15604128-202602-05 (in Russian)

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