Simulation of the Parallel Operation of External and Railway Ac Traction Power Supply System Taking Into Account Unbalanced Conditions

Zemskyi, Denys R.; Sychenko, Viktor H.; Bosiy, D. O.

doi:10.15407/techned2020.02.074

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Th e modeling approach is based on Kirchhoff diff erential equations for electrical circuits, method of phase coordinates, and decomposition of a given power supply system on typical blocks to unify the subsystem. Th e mathematics part of the approach was presented in scientifi c article [6]. Th e general equations of the mathematical model may be described in matrix form by:…”

Section: Modeling Approach Used For Calculationsmentioning

confidence: 99%

Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers

Bosyi¹,

Zemsky²

2020

Problemy Kolejnictwa - Railway Reports

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The article is devoted to the problem of non-traction consumers power supply of AC railways. The low efficiency of energy transfer is caused by the design of a non-traction power supply line. The absence of bilateral power is typical for non-traction network 27,5 kV which consist of “two wire-rail” lines. This line is outdated technology, which does not correspond to modern requirements on the power quality, but used on AC railways with three-phase traction transformers. The purpose of the article is to investigate the methods of power supply improvements for non-traction consumers in terms of voltage unbalance, harmonic distortions and energy losses. Connection of the phasing device to delta winding traction transformer for bilateral supplying non-traction customers from network 27,5 kV is suggested in the article. The implementation of a method to increase the efficiency of electricity transmission in the non-traction network power supply allows to reduce power losses from 720 MWh / year to 441 MWh / year, the voltage unbalance from 1,9% to 1,3% and the total harmonic distortion from 8 % to 6 % respectively. Additionally, investment attractiveness of the decision was evaluated. Keywords: non-traction customers, two wire-rail line, phase coordinates, AC railway, power quality

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Section: Modeling Approach Used For Calculationsmentioning

confidence: 99%

Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers

Bosyi¹,

Zemsky²

2020

Problemy Kolejnictwa - Railway Reports

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“…Podejście modelowe oparte jest na równaniach różniczkowych Kirchhoff a dla obwodów elektrycz-nych, metodzie współrzędnych fazowych oraz rozkładzie danego systemu zasilania na typowe bloki w celu ujednolicenia podukładu. Matematyczną część tego podejścia przedstawiono w artykule [6]. Ogólne równania modelu matematycznego mogą być opisane w formie macierzy:…”

Section: Podejście Modelowe Stosowane W Obliczeniachunclassified

Zwiększanie wydajności zasilania dla odbiorców linii „Dwa przewody – szyna” (TWR)

Bosyi¹,

Zemskyi²

2020

Problemy Kolejnictwa - Railway Reports

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Artykuł jest poświęcony problemowi zasilania odbiorników nietrakcyjnych w układach zasilania prądu przemiennego (AC). Konstrukcja tych sieci ma niską wydajność przesyłu energii ze względu na brak dwustronnego zasilania sieci nietrakcyjnej 27,5 kV, składającej się z dwóch przewodów i szyny (TWR). Linia tego typu ma przestarzałą konstrukcję, która nie odpowiada współczesnym wymaganiom w zakresie jakości zasilania, ale jest stosowana na kolei AC z trójfazowymi transformatorami trakcyjnymi. Celem artykułu jest zaproponowanie metod usprawnienia zasilania dla odbiorców sieci nietrakcyjnej w zakresie asymetrii napięć, zniekształceń harmonicznych i strat energii. W artykule zaproponowano podłączenie urządzenia fazowego do transformatora trakcyjnego z uzwojeniem trójkątnym do obustronnego zasilania odbiorców nie-trakcyjnych z sieci 27,5 kV. Wdrożenie metody zwiększenia wydajności przesyłu energii elektrycznej w sieci nietrakcyjnej umożliwia zmniejszenie strat mocy z 720 MWh do 441 MWh rocznie, a także zmniejszenie asymetrii napięcia z 1,9 do 1,3 oraz całkowitych zniekształceń harmonicznych odpowiednio z 8% do 6%. Dodatkowo oceniono atrakcyjność inwestycyjną podjęcia decyzji po zastosowaniu metody opisanej w artykule. Słowa kluczowe: odbiorcy nietrakcyjni, linie dwa przewody – szyna (TWR), współrzędne fazowe, kolej AC, jakość zasilania

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Modelling of traction power supply systems with nonlinear stationary loads

Kryukov,

Cherepanov,

Nguyen

2024

jour

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The aim was to develop digital models of traction power supply systems with nonlinear stationary loads in order to determine asymmetric and non-sinusoidal modes. To this end, methods based on phase coordinates were implemented in the Fazonord software package (version 5.3.4.1–2024). The models included the following elements: 220 kV transmission lines, 40 MV·A transformers, 25 kV traction networks of double-track sections and a converter unit powering the industrial transport power supply system. The developed models identified asymmetrical and nonsinusoidal modes during the movement of a train on a specific section of the main railway. It was demonstrated that the nonlinear stationary load generated by a six-pulse converter results in an increase in harmonic coefficients at the 10 and 220 kV inputs of the traction substation feeding the rectifier, exceeding 25% on the 10 kV busbars. This phenomenon should be considered when selecting means to reduce harmonic distortion. These include passive filters, active conditioners and new-generation electric rolling stock with four-quadrant converters. The maximum asymmetry coefficients on the 10 kV busbars of traction substations ranged from 4.8...9%. These values can be reduced down to acceptable limits using phase-controlled reactive power sources or balancing transformers. The presented models allow all the parameters of the AC railway power supply system to be adequately determined under stationary loads with nonlinear voltage-current characteristics. The developed method is versatile and can be used for calculating modes of supply and traction networks of various structures and designs.

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Simulation of the Parallel Operation of External and Railway Ac Traction Power Supply System Taking Into Account Unbalanced Conditions

Cited by 3 publications

References 5 publications

Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers

Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers

Zwiększanie wydajności zasilania dla odbiorców linii „Dwa przewody – szyna” (TWR)

Modelling of traction power supply systems with nonlinear stationary loads

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