Smart Electrical Infrastructure for AC-Fed Railways With Neutral Zones

Pilo, E.; Mazumder, Sudip K.; González-Franco, Ignacio

doi:10.1109/tits.2014.2336535

Cited by 35 publications

(39 citation statements)

References 14 publications

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“…The centralized architecture can perform a global optimization to achieve the cooperative operations between each component, significantly enhancing the energy-management performance of the systems. The distributed control can further enhance redundancy and reliability of the railway systems [31,33]. Each EPTD and PTD can realize data acquisition (DA) of voltage and current on each power supply section and transmit the data to the EMS via the bidirectional communication equipment.…”

Section: Description Of the Modified Systemmentioning

confidence: 99%

“…The traction transformer will experience huge power at peak positions, when power surges to traction transformer. In addition, the operation cost and the investment cost are large if the traction transformers are designed according the peak power in convention [22,28,33,35,36]. The effect of peak power surges can be reduced by the modified system.…”

Section: Peak Cutting and Valley Filling Controlmentioning

confidence: 99%

“…Then, part of the traction power in one feeding section can be supplied by the RBE recovered from the other adjacent feeding section, similar to Figure 1e. Figure 1g illustrates the scheme that complements the existing railway power supply system with additional PTDs [33]. This makes it possible for control of power flow through the whole railway system.…”

Section: Introductionmentioning

confidence: 99%

“…However, there is a neutral zone (NZ) in the existing traction power supply system, which limits energy optimization capability. Thus, [33] introduced the smart electrical infrastructure into railway systems to complement the existing electrical railway infrastructure, creating more opportunities and controllability for smart railway systems, such as power flow in the whole railway system (similar to power routing). The smart grid concept presents more efficient, safe, reliable, and modernized railway systems and offers a new perspective to the eco-friendliness of railway systems and low carbon societies in the future.…”

mentioning

confidence: 99%

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Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Gao

et al. 2019

Energies

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This paper presents a modified power supply system based on the current alternating current (AC)-fed railways with neutral zones that can further improve the eco-friendliness and smart level of railways. The modified system complements the existing infrastructure with additional energy-storage-based smart electrical infrastructure. This infrastructure comprises power electronic devices with energy storage system connected in parallel to both sides of each neutral zone in the traction substations, power electronic devices connected in parallel to both sides of each neutral zone in section posts, and an energy management system. The description and functions of such a modified system are outlined in this paper. The system allows for the centralized-and distributed-control of different functions via an energy management system. In addition, a control algorithm is proposed, based on the modified system for regenerative braking energy utilization. This would ensure that all the regenerative braking energy in the whole railway electrical system is used more efficiently. Finally, a modified power supply system with eight power supply sections is considered to be a case study; furthermore, the advantages of the proposed system and the effectiveness of the proposed control algorithm are verified.The installation of equipment that provide clean energy from renewable sources (e.g., solar panels and wind generators) to feed the traction loads in rail may have a significant impact in the energy costs and CO 2 emissions of a railway system, increasing the environment friendliness of the railway [4][5][6]. The introduction of renewable energy is to partially reduce the depletion of non-renewable energy resources and thus reduce CO 2 emissions. These outcomes have been favored by scholars and many countries, such as North American, European, China, and Japan [6,7]. But in practice, the traction energy consumption of railways has not been reduced.By contrast, the efficient driving and regenerative braking schemes differ the renewable energy scheme. They can essentially reduce the traction energy consumption of railways.Efficient driving is an effective way to reduce the traction energy consumption of rolling stock. Typically, the running state of vehicles comprises three phases: braking, speed-holding (cruising) and acceleration. At present, many literatures have studied the efficient driving and realize the traction energy savings through the optimum combination of these phases [8][9][10][11][12][13]. To implement such trajectories and maximize savings, some auxiliary systems, such as driver advisory systems (DAS) [10,11] and automatic train operation (ATO) [12,13], must be provided to drivers. The trials of such systems have shown savings of 5-18%. However, with efficient driving, the savings of energy consumption may sacrifice service quality, such as the train speed, stopping time, etc. [1].Regenerative braking energy (RBE) recovery is a simple and efficient way to reduce energy consumption, which cannot influence the operati...

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Section: Description Of the Modified Systemmentioning

confidence: 99%

Section: Peak Cutting and Valley Filling Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Gao

et al. 2019

Energies

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“…All of this is done on a limited number of scenarios, which are those that the authors believe to be the worst in terms of voltage drop in the line. In this latter work [5], the authors are focusing in improving investment costs and railway electrical grid in a AC system with neutral zones. Using a MIP this technique is able to reach a better electrical grid in supply railway system.…”

Section: A Literature Reviewmentioning

confidence: 99%

Methodology for Multiobjective Optimization of the AC Railway Power Supply System

Soler

López

Pedro

et al. 2015

IEEE Trans. Intell. Transport. Syst.

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Electrical dimensioning design in a railway infrastructure has high complexity and is strongly nonlinear. There are several parameters and constraints to take into account. The presented methodology is working to improve the decision making about the design, hence developing an expert system. The final set of possible solutions that the method is achieved is based on a pair of main objectives. On the one hand are installation costs, environmental impact, main electrical components costs such as catenary, traction substations, neutral zones, and the difficulty to connect substation to general electric grid. On the other hand are exploitation costs, such as maintenance costs and energy loss depending on the dimensioning design. A specific line discretization has been developed in order to distribute the critical zones along the line. Integration of a multiobjective genetic algorithm (NSGA-II), hence the code of the genotype, is another highlight. Electrical analysis, railway systems using single alternate current (1 × 25), and a simplification due to the search of the highest peaks of power demanded by the trains during simulations help to minimize the quantity of studies. Every simulation is possible by using a railway simulator, Hamlet, which provides modules such as infrastructure, rolling stock, signaling, and electrical. Designers have the possibility to analyze several scenarios with different railway exploitation critical levels, analyze electrical degraded situations, and finally obtain an optimal Pareto Front, reaching a powerful methodology to help in the electrical dimensioning design.Index Terms-Multiobjective, neutral zone, overhead contact line, traction substations, zonal discretization. 1524-9050

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Traction power substation balance and losses estimation in AC railways using a power transfer device through Monte Carlo analysis

Morais

Martins

2022

Rail. Eng. Science

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The high dynamic power requirements present in modern railway transportation systems raise research challenges for an optimal operation of railway electrification. This paper presents a Monte Carlo analysis on the application of a power transfer device installed in the neutral zone and exchanging active power between two sections. The main analyzed parameters are the active power balance in the two neighbor traction power substations and the system power losses. A simulation framework is presented to comprise the desired analysis and a universe of randomly distributed scenarios are tested to evaluate the effectiveness of the power transfer device system. The results show that the density of trains and the relative branch length of a traction power substation should be considered in the evaluation phase of the best place to install a power transfer device, towards the reduction of the operational power losses, while maintaining the two substations balanced in terms of active power.

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Smart Electrical Infrastructure for AC-Fed Railways With Neutral Zones

Cited by 35 publications

References 14 publications

Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Methodology for Multiobjective Optimization of the AC Railway Power Supply System

Traction power substation balance and losses estimation in AC railways using a power transfer device through Monte Carlo analysis

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