Simulation study of DC transit systems with inverting substations

Mellitt, B.; Mouneimne, Z.S.; Goodman, C.J.

doi:10.1049/ip-b.1984.0008

Cited by 49 publications

(28 citation statements)

References 4 publications

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“…a train brakes when another train is accelerating at the same time). This enables reuse of the regenerative energy; otherwise it would be lost through heat dissipation [4].…”

Section: A Optimal Headwaymentioning

confidence: 99%

Energy saving strategies in Mass Rapid Transit systems

Peng

Chen

2014

2014 International Conference on Connected Vehicles and Expo (ICCVE)

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The energy cost accounts for a very high proportion of the operating cost of Mass Rapid Transit (MRT) systems and energy price continues to rise. Therefore, the energy cost of MRT systems will continue to increase. If some energy saving strategies are implemented, operating cost and energy consumption of MRT systems can be greatly reduced.This study analyzes the optimal schedule, regenerative taper voltage adjustment and no-load voltage adjustment of traction substations to determine energy saving strategies. A case study of a Taipei MRT line, under different operating conditions is analyzed.This research adopts commercial railway system software to simulate the operation of the Taipei MRT line. Regenerative braking energy and some other conditions for energy saving strategies are simulated. Energy saving effects are estimated to show the achievement of operational cost savings.

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“…a train brakes when another train is accelerating at the same time). This enables reuse of the regenerative energy; otherwise it would be lost through heat dissipation [4].…”

Section: A Optimal Headwaymentioning

confidence: 99%

Energy saving strategies in Mass Rapid Transit systems

Peng

Chen

2014

2014 International Conference on Connected Vehicles and Expo (ICCVE)

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“…However, when the distance between tram vehicles is significant, the recovery of braking energy is possible if, at the same time, a train is accelerating and another is braking [7]. As a result the recovery of kinetic energy during braking subjects to unpredictable traffic conditions [8]. Implementation of energy storage system on-board a tram allow the optimised recovery of braking energy and catenary free operation.…”

Section: Electrical Drive Systemmentioning

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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“…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].…”

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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Simulation study of DC transit systems with inverting substations

Cited by 49 publications

References 4 publications

Energy saving strategies in Mass Rapid Transit systems

Energy saving strategies in Mass Rapid Transit systems

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

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

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