Authors:
Andrey Kryukov
1
;
2
;
Konstantin Suslov
3
;
2
;
Aleksandr Cherepanov
1
;
Quoc Hieu Nguyen
2
and
Ilya Shushpanov
4
Affiliations:
1
Department of Transport Electric Power, Irkutsk State Transport University, Irkutsk, Russia
;
2
Department of Power Supply and Electrical Engineering, Irkutsk National Research Technical University, Irkutsk, Russia
;
3
Department of Hydropower and Renewable Energy, National Research University “Moscow Power Engineering Institute”, Moscow, Russia
;
4
Shandong Women’s University, China
Keyword(s):
Electricity Supply to the DC Traction Substations, Cable Power Transmission Lines, Modeling.
Abstract:
The connection of railway traction substations (TS) to high-voltage networks of electric power systems relies on overhead power transmission lines. This approach has several downsides: considerable width of the protection zone; potential for damage during strong winds, and the accumulation of ice and frost deposits. Additionally, there is a risk of injury to both people and animals caused by step voltages resulting from wire breakage. The noted negative consequences can be forgotten when using 110 kV cable lines (CL) with cross-linked polyethylene (XLPE) insulation for connecting traction substations. The study presented in this paper aims to develop digital models for determining power flows in direct current traction power supply systems (DC TPSS) with power supply to converter substations via cable line. Multiphase modeling methods are used alongside the Fazonord software product, specifically version 5.3.5.0–2024. The obtained results allow us to draw the following conclusions: t
he use of cable lines leads to an increase in the minimum three-minute voltages of 2 to 3.5%, while active power losses in the main power transmission line decrease by 8 to 14%. DC traction substations do not create some noticeable levels of unbalance in the adjacent networks. However, any unbalance in a three-phase system has a negative effect on power consumers, especially on widely used induction electric motors. The use of XLPE cables allows reducing unbalance factors by 11-22 times. In the presence of overhead lines (OL), the levels of harmonic distortions on the 110 kV buses of traction substation (TS) 2 and TS 3 exceed the normally permissible values. Replacing the overhead lines with cable lines makes it possible to reduce the indicators by approximately 60%. The factors of certain harmonics are reduced by 37...100%. The developed digital models can be used to design and operate DC TPSS. The method for power flow determination is universal and can be used to make calculations for external power supply systems of any configuration and traction networks of various designs.
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