Electrical railway power supply systems: Current situation and future trends

Somoza, Blanca Castells; Abrahamsson, Lars; Castaño-Solís, Sandra; Sanz-Feito, J.

doi:10.1016/j.ijepes.2017.05.008

Cited by 96 publications

(50 citation statements)

References 72 publications

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“…The power system may have a harmonic resonance frequency because of the interaction between the transmission lines inductive and capacitive reactances. However, a related point to consider is the harmonic problem can be worsened when the harmonic resonance may occur, once the harmonic currents injected by the locomotives match one or more of the power system natural frequencies (the natural frequency refers to a value at which the electric power system tends to perform the resonance phenomenon) [1], [6]. In such situations, harmonic distortion will increase to reach high levels and the harmonic resonance will happen accompanied by large waveform oscillations of amplitude.…”

Section: B Harmonic Contentmentioning

confidence: 99%

“…In such situations, harmonic distortion will increase to reach high levels and the harmonic resonance will happen accompanied by large waveform oscillations of amplitude. This scenario leads to serious impacts on both PPS and TPS, and it may cause the total collapse of the adjacent power devices, especially on the TPS side [6].…”

Section: B Harmonic Contentmentioning

confidence: 99%

“…The NSCs of currents injected in the PPS are neglected when the electrified sections have the same loads [15]. Regarding the harmonic distortion, balanced transformers can be an interesting choice, since they can lead to some harmonics cancellation [6]. However, and after considering the facts of complex winding configurations and an unequal number of turns on each phase, these reasons can cause non-perfect balanced situation even when the load sections are equally loaded [3].…”

Section: Using Balanced Three-phase Power Transformersmentioning

confidence: 99%

“…The impedance matching power transformer presented in Fig 2(c) is the most used one in China. Woodbridge power transformer normally requires two additional autotransformers for the two-phase railway traction power supply [6], [16]. The unbalanced V/V power transformer has a very simple construction comparing to the balanced power transformers and it can be overloaded [4].…”

Section: Using Balanced Three-phase Power Transformersmentioning

confidence: 99%

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Power quality phenomena in electrified railways: Conventional and new trends in power quality improvement toward public power systems

Tanta

Monteiro

Sousa

et al. 2018

2018 International Young Engineers Forum (YEF-ECE)

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Nowadays, railway electrification is the most efficient way to power the trains. However, power quality (PQ) phenomena toward public power systems (PPSs) have always a main concern to the railway operators, especially when the single-phase traction power system is interconnected to the three-phase PPS. The last decades have witnessed an on-going evolution of PQ improvement and traction power supply systems, contributing to diminish the negative impacts of AC railway networks on PQ of the three-phase PPS. In this context, this paper presents a global overview of the PQ phenomena in AC railway electrification, as well as the impacts of the potential hazards on the safe operation of electrified railways. The paper also reviews PQ improvement methods from the early use of AC railway electrification until the emergence of the new power electronics devices in railways industry.

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Section: B Harmonic Contentmentioning

confidence: 99%

Section: B Harmonic Contentmentioning

confidence: 99%

Section: Using Balanced Three-phase Power Transformersmentioning

confidence: 99%

Section: Using Balanced Three-phase Power Transformersmentioning

confidence: 99%

See 2 more Smart Citations

Power quality phenomena in electrified railways: Conventional and new trends in power quality improvement toward public power systems

Tanta

Monteiro

Sousa

et al. 2018

2018 International Young Engineers Forum (YEF-ECE)

View full text Add to dashboard Cite

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“…A few decades ago, inverters were introduced into DC traction power supply system to recover the regenerative braking energy [6][7][8]. Compared to energy storage equipment [9][10][11], inverters show considerable advantages in cost, reliability and installing space, so have been paid more and more attention [12][13][14]. However, inverters installed in the substations do not work all the time.…”

Section: Introductionmentioning

confidence: 99%

A Novel Hybrid DC Traction Power Supply System Integrating PV and Reversible Converters

Zhang

Tian

et al. 2018

Energies

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A novel hybrid traction power supply system (HTPSS) integrating PV and reversible converter (RC) is proposed. PV is introduced to reduce the energy cost and increase the reliability of power systems. A reversible converter can achieve multiple objectives including regenerative braking energy recovery, PV energy inverting, DC voltage regulation and power factor improvement. In this paper, the topology and operating modes of the HTPSS are first introduced. Three-level boost converter (TLBC) is employed in the PV system. A double closed-loop control scheme considering both maximum power point tracking (MPPT) and midpoint potential balancing (MPB) is recommended. The reversible converter adopts a multi-modular topology and the independent control for active power and reactive power has been achieved by a current decoupling control. According to the working characteristic of each device, a coordinated control strategy is designed, and four basic principles are given. A system simulation model containing a hybrid traction substation and a train was built, and comprehensive simulations under multi-scenario were carried out. The results show that the reversible converter can accomplish PV energy inversion, DC voltage regulation, regenerative braking energy recovery and power factor improvement, by which a high utilization rate and energy-saving effect can be obtained.Energies 2018, 11, 1661 2 of 24 train runs between two substations, the braking time is only 10-15 s under normal circumstances. The relatively low utilization rate, in addition to the single function (just inverting), result in a long investment payback period. It is becoming the main obstacle for the massive application of inverters.Urban rail transit is becoming a big energy consumer and has significant impacts on energy consumption at a regional scale [15]. It turns out to be more and more urgent to reduce system energy consumption through all possible means. As a clean energy, photovoltaic has had rapid development all over the world recently, and the installed capacity has been increasing year by year [16,17]. Large-scale PV plants are mainly located in the desert regions due to the high solar irradiance and vast area, but the output power is usually constrained by the transmission capacity of the grid [18]. Future development will focus on the distributed PV system, which is located as close to the user as possible [19]. Railway companies have much potential to introduce PV system around railway premises, such as the roof of platforms, substations, vehicle depots, sound walls and other buildings or openings along the line [20]. It is reported that the PV system installed on platform roof of Tokyo station generates 340 MWh electric energy annually [20]. The possibility of introducing PV technologies into traction power supply system is discussed in [21], but solar energy is just used for air conditioning and lighting. In [22], a grid-connected PV system is introduced in TPSS. However, it is not an optimal scheme for the transmission and distribution of...

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Optimal stochastic energy management of electrical railway systems considering renewable energy resources' uncertainties and interactions with utility grid

Ehteshami

Hashemi‐Dezaki

Javadi

2022

Energy Science & Engineering

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Several studies have been reported for optimal operation of electrical railway systems (ERSs). However, the stochastic energy management of ERSs, including renewable energy resources (RERs), has received less attention. The RERs’ uncertainties might affect the ERSs. On the other hand, the calculation time of the Monte Carlo simulation (MCS)‐based approaches is an essential challenge, which should be solved, particularly in real‐time decisions and recursive optimization problems. Thus, it is crucial to study the ERSs' stochastic behaviors and uncertainties, including RERs. This paper tries to overcome the discussed concerns and challenges by proposing a novel ERS’s optimal stochastic energy management using clustering algorithms. In this paper, the backward scenario reduction algorithm has been used. In addition, regenerative braking energy (RBE) and energy management systems (ESSs) have been studied. Studying the impacts of changes in the number of passengers on the optimized operation of ERSs and investigating the interaction between the utility grid and the ERS are other contributions of this research. The proposed method is applied to an actual test system of Tehran Urban and Suburban Railway Operation Company (TUSROC). Test results are validated by comparing with available MCS‐based methods. Simulation results illustrate the accuracy and computation time advantages of the proposed method. Simulation results illustrate that <0.6% inaccuracy appears in the proposed method, while it would be 500 times faster than MCS‐based ones. The comparative test results show the advantages of the introduced method.

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Electrical railway power supply systems: Current situation and future trends

Cited by 96 publications

References 72 publications

Power quality phenomena in electrified railways: Conventional and new trends in power quality improvement toward public power systems

Power quality phenomena in electrified railways: Conventional and new trends in power quality improvement toward public power systems

A Novel Hybrid DC Traction Power Supply System Integrating PV and Reversible Converters

Optimal stochastic energy management of electrical railway systems considering renewable energy resources' uncertainties and interactions with utility grid

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