Energy Evaluation for DC Railway Systems with Inverting Substations

Tian, Zhongbei; Zhang, Gang; Zhao, Ning; Hillmansen, Stuart; Tricoli, Pietro; Roberts, Clive

doi:10.1109/esars-itec.2018.8607710

Cited by 23 publications

(10 citation statements)

References 10 publications

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“…√2 × 1225 ≈1732.41 V). This creates a deadband for the transition between inverting and rectifying [16], avoiding the current circulation between the rectifier and the VSI. The three-phase voltage 3 and current 3 simulated at the AC grid are used to calculate the power exchange between AC and DC sides via the RSS.…”

Section: A Converter Topologies At Reversible Substationmentioning

confidence: 99%

Reversible Substation Modelling with Regenerative Braking in DC Traction Power Supply Systems

Fan

Ziani

et al. 2021

2021 IEEE Texas Power and Energy Conference (TPEC)

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Compared to traditional unidirectional substations, a reversible substation (RSS) permitting bidirectional power flows is an efficient approach to recovering the braking energy of trains and increasing the energy efficiency of DC traction power supply systems (TPSS). This paper develops two models to reflect the role of an RSS under high and low fidelities, focusing on the converterand TPSS-level simulation respectively. A particular RSS topology consisting of a 12-pulse diode rectifier and an antiparallel active neutral point clamped voltage source inverter (VSI) is replicated in a high-fidelity model where the VSI is controlled to maintain a constant DC voltage in the braking mode. To reduce computation burden, a low-fidelity model simplifies the rectifier into a diode in series with a controlled voltage source (CVS) that reflects its nonlinear output characteristics, and connects a DC voltage source in parallel with the CVS branch, permitting the delivery of braking power to the RSS under the constant DC voltage control. The two models are tested based on a simplified 1.5 kV TPSS and discussed alongside the consistency in the simulation of the power exchange and voltage transients at the RSS in traction and braking modes.

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Section: A Converter Topologies At Reversible Substationmentioning

confidence: 99%

Reversible Substation Modelling with Regenerative Braking in DC Traction Power Supply Systems

Fan

Ziani

et al. 2021

2021 IEEE Texas Power and Energy Conference (TPEC)

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“…Fig. 2 shows the characteristics of diode rectifiers [17], thyristor‐controlled rectifiers [7, 8], and inverter rectifiers [18, 19]. The rectifier power output corresponding to the specified voltage can be described by mathematical functions or circuit models, as shown in Fig.…”

Section: Substation Circuit Modelmentioning

confidence: 99%

“…Finally, the TTY Line example shows that the proposed method can include accurate models of modern trains with regeneration capability and inverter substations that are addressed in the recently published literature [17–19]. The voltage–power characteristics of the inverter substations can be fully described by the piece‐wise function in (19) without any approximation or linearised simplification.…”

Section: Numerical Examplesmentioning

confidence: 99%

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Modelling and numerical solution of ungrounded DC rail traction system load flow using ladder circuit – part II: solution method

Liu

2019

IET Generation, Transmission & Distribution

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“…Four are the main aspects that can influence the energy efficiency of electric railway systems. The weight of the vehicle, the efficiency of the electric energy conversions (both in substations and in traction systems), the driving profile and the recovering of kinetic energy during the braking, [2]. Several methods could be implemented to intervene on these aspects, but in this paper, we are focused on the last one.…”

Section: Introductionmentioning

confidence: 99%

Monitoring a DC Train Supplied by a Reversible Substation

Cipolletta

Femine

Gallo

et al. 2020

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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European energy policy has been supporting a gradual shift towards an efficient energy management in order to reduce the railway transport emissions by 50 % within 2030. One of the most promising solutions to reduce emissions is the recovery of braking energy: it is possible to convert kinetic energy back to the electrical form and reinject it back to the grid. Currently, because of the unidirectional nature of the substation, the receptivity of the supply network is limited and only a small part of the traction energy is sent back to the catenary. The remaining part is usually wasted on the train braking rheostats. In this scenario, new installations of reversible substations in DC railway systems, can improve energy savings. In this paper, in order to evaluate the impact of this innovative technology, a preliminary analysis of the data acquired during a measurement campaign conducted jointly with Metro de Madrid (train and substation owner) and HitachiRail (train manufacturer) is presented. Energy exchanged between train and supply line and real-time power quality events survey can be valuable tools to make an estimation of the impact of the reversible substation.

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Energy Evaluation for DC Railway Systems with Inverting Substations

Cited by 23 publications

References 10 publications

Reversible Substation Modelling with Regenerative Braking in DC Traction Power Supply Systems

Reversible Substation Modelling with Regenerative Braking in DC Traction Power Supply Systems

Modelling and numerical solution of ungrounded DC rail traction system load flow using ladder circuit – part II: solution method

Monitoring a DC Train Supplied by a Reversible Substation

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