Modeling Electrified Transit Systems

Chymera, M.; Renfrew, A.C.; Barnes, Mike; Holden, John

doi:10.1109/tvt.2010.2050220

Cited by 52 publications

(22 citation statements)

References 11 publications

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“…The QS1 model can be considered as representative of the conventional approach used in most of the existing simulation tools [5], [9]. This model neglects the DC bus and considers the train as a pure current source it(t) (Fig.…”

Section: B Quasi-static Model 1 (Qs1)mentioning

confidence: 99%

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Different Models for the Simulation of DC Railway Systems Supplied by Non-Reversible Substations

Mayet

Arboleya

Bouscayrol

et al. 2019

2019 IEEE Vehicle Power and Propulsion Conference (VPPC)

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Simulation is a valuable way to develop efficient design of the infrastructure and operations of electrical railway systems. Nevertheless, the size of such systems and the complexity of the power flows lead to complex models that require simplifications. A specific scenario has been identified as particularly difficult to study with most of the existing simulation tools. This scenario consists in a line with low energy recovery capacity in which all the substations are blocked. In such case, the railway system is disconnected from the AC grid and becomes an islanded system in which the braking trains, and eventually energy storage subsystems, supply other trains in traction mode. This paper aims to compare different modelling approaches to simulate DC railway systems in this specific scenario. The results highlight that conventionnal approach is not able to deal with this scenario. Another approach, based on a dynamic model from previous research works, is well able to estimate the system behavior with this scenario, but it leads to long computational time. Finally, an intermediary approach is proposed to simplify the model in such scenario and potentially reduce the computation time.

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Section: B Quasi-static Model 1 (Qs1)mentioning

confidence: 99%

“…It becomes an islanded system in which the braking trains supply the other consumers. In such case, some simulation tools neglect what happens in the system during this period because no energy is provided by the AC grid [5], [9]. Other simulation tools use complex iterative methods to approach the mathematical solution [8], [11].…”

Section: Introductionmentioning

confidence: 99%

Different Models for the Simulation of DC Railway Systems Supplied by Non-Reversible Substations

Mayet

Arboleya

Bouscayrol

et al. 2019

2019 IEEE Vehicle Power and Propulsion Conference (VPPC)

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“…The tramway consists of current injection points at station stops, which are frequently spaced with a total of 30 stops along the 13km route. An adopted inverse modelling technique [9] was used. The rail-wheel contact subsystem shown in Figure 1 represent the total tractive effort (resistive forces).…”

Section: B System Modellingmentioning

confidence: 99%

“…The coefficients , , and are often experimentally determined [9]. Coefficients and of the Davis equation include the resistive forces that are related to the mass of the tram, one of the reasons for reducing the weight of tram vehicles.…”

Section: B System Modellingmentioning

confidence: 99%

An On-board Energy Storage System for Catenary Free Operation of a Tram

Al-Ezee¹,

Tennakoon²,

Taylor³

et al. 2017

REPQJ

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Modern cities require zero emissions, silent, and energy efficient transport solutions that have low or no visual impact on the environment. On-board energy storage systems have a significant role in providing the required energy during catenary free operation of trams and in recovering regenerated energy from braking. The energy consumption of a commercial tram for a total journey length of 13km has been simulated for proper sizing of the onboard energy storage. The energy storage system is recharged during stops at stations through wayside power delivery technologies and by the use of available braking energy. Due to this, the on-board energy storage system is required to provide a catenary free gap of about 1km. A power conversion system, Bi-Directional DC-DC converter, and a charge/discharge energy management system are required for the realisation of catenary free system.

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“…Different simulation methods for electric railways have been proposed in extant literature [14][15][16][17][18][19][20]. However, these approaches provide only the voltages experienced by the trains and not the track voltage.…”

Section: Introductionmentioning

confidence: 99%

Electrical Modelling of a DC Railway System with Multiple Trains

2018

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Electrical modelling of rail tracks with multiple running trains is complex due to the difficulties in solving the power flow. The train positions, speed and acceleration are constantly varying resulting in a nonlinear system. In this work, a method is proposed for modelling DC electric railways to support power flow analysis of a simulated metro train service. The method exploits the MathWorks simulation tool Simscape, using it to model the mechanical and electrical characteristics of the rail track system. The model can be simulated to provide voltages at any position in the track and additionally, the voltages seen by any train. The model includes regenerative braking on trains, this is demonstrated to cause overvoltage in the feeding line if it is higher than the power demand of the other trains at that time. Braking resistors are used to protect the network from overvoltage by burning the excess energy. Through the implementation of Energy Storage Systems (ESSs), it will be possible to improve the energy efficiency and remove timetabling restrictions of electric railways by effectively controlling the rail track voltage. The paper proposes several methods to validate the model.

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Modeling Electrified Transit Systems

Cited by 52 publications

References 11 publications

Different Models for the Simulation of DC Railway Systems Supplied by Non-Reversible Substations

Different Models for the Simulation of DC Railway Systems Supplied by Non-Reversible Substations

An On-board Energy Storage System for Catenary Free Operation of a Tram

Electrical Modelling of a DC Railway System with Multiple Trains

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