Abstract
The development of electric power industry requires transition to the technological platform, encouraging implementation of smart grids. To set up these grids it is necessary to apply smart technologies of power supply system control modes, as well as interfaces, ensuring the connection of renewable energy sources. These interfaces may be represented by energy routers. The paper discusses the results of simulating emergency modes, caused by short circuits in 10 kV and 0.4 kV grids of non-traction users, connected via energy routers to the railway power supply system. The studies were performed in MATLAB system. Simulation results showed that the application of controlled energy routers for the non-traction user power supply completely removes electric power quality problems, allows for reliable integration of distributed generation plants into the power supply system, and limits short circuit currents and reduces the depth of the AC failure.
Highlights
The development of electric power industry requires transition to the technological platform, encouraging implementation of smart grids
Numerous solid-state transformer (SST) configurations have been suggested [15, 16]. They may be categorized into the following major groups: a singlestep topology with AC forward conversion; a two-step topology with a low-voltage DC link; a two-step topology with a high-voltage DC link; a three-step topology with low and high voltage DC links
The analysis of the simulation findings shows that an energy router enables to limit short circuit currents compared to a traditional transformer; at the same time surge currents are limited to higher degree
Summary
The development of electric power industry requires transition to the technological platform, encouraging implementation of smart grids. To set up these grids it is necessary to apply smart technologies of power supply system control modes [1,2,3,4,5,6,7], as well as interfaces, ensuring the connection of renewable energy sources. These interfaces may be represented by energy routers (ER) [8,9,10]. The work considers an ER three-step topology and presents the results of simulating emergency modes, caused by short circuits in 10 kV and 0.4 kV grids of non-traction users, connected to the railway power supply system with an ER
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