High-voltage DC-feeder solution for electric railways

Abrahamsson, Lars; Kjellqvist, Tommy; Östlund, Stefan

doi:10.1049/iet-pel.2011.0219

Cited by 26 publications

(21 citation statements)

References 17 publications

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“…The maximum current a converter unit can handle, is calculated with the assumption that the converter unit can provide nominal apparent power at the lowest AC voltage it is designed for [2]. Hence, the nominal apparent power of the converter unit is set to 1 p.u.…”

Section: Hvdc Convertermentioning

confidence: 99%

“…Assuming inverter mode operation according to [2], the losses can be modelled as a second order polynomial according to equation (8), depending on the converter AC current, equation (7). The quadratic term and linear terms represents the current dependent losses and the constant term in (8) represents the no-load losses of the converter [1,2].…”

Section: Hvdc Convertermentioning

confidence: 99%

“…The concept of an RPSS fed through optimally controlled HVDC converters has been presented in [2]. The proposed converter technology for the HVDC feeder solution uses medium frequency transformers, in order to reduce the size of the converter [3].…”

Section: Introductionmentioning

confidence: 99%

“…This paper follows the ideas of [2], were the HVDC feeder solution was investigated for an RPSS equipped with OCL with Booster Transformers (BT). However, this paper compares transmission losses and voltage levels for:…”

Section: Introductionmentioning

confidence: 99%

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OPF for an HVDC feeder solution for railway power supply systems

Laury¹,

Abrahamsson²,

Östlund³

2014

WIT Transactions on the Built Environment

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With increasing railway traffic, the demand for electrical power increases. However, railway power systems are often weak causing high transmission losses and large voltage drops.One possible method to strengthen the railway power supply system is to implement a High Voltage Direct Current (HVDC) feeder in parallel to the Overhead Contact Line (OCL). The HVDC feeder is connected to the OCL by converters.The paper describes different properties and characteristics of such an HVDC feeder solution. An AC/DC unified Optimal Power Flow (OPF) model and unit commitment is used to obtain proper control of the converters.The non-linear load flow and converter loss equations, and the binary variables for the unit commitment, lead to an optimization problem of Mixed Integer Non-Linear Programming (MINLP) type. The optimization problem is formulated in the software GAMS, and is solved by the solver BONMIN. In each case, the objective has been to minimize the total active power losses.

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Section: Hvdc Convertermentioning

confidence: 99%

Section: Hvdc Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

OPF for an HVDC feeder solution for railway power supply systems

Laury¹,

Abrahamsson²,

Östlund³

2014

WIT Transactions on the Built Environment

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“…A 2 × 25 kV AC feeding system has certain advantages when compared to other AC feeding systems [6]. Network frequencies of 50 Hz and lower are used in AC railways [7]. The power flow analysis, electrification system, and traction power system simulation are performed after determining the catenary supply voltage.…”

Section: Introductionmentioning

confidence: 99%

Creation of a dynamic model of the electrification and traction power system of a 25 kV AC feed railway line together with analysis of different operation scenarios using MATLAB/Simulink

Kocaarslan¹,

Akçay²,

Ulusoy³

et al. 2017

Turk J Elec Eng & Comp Sci

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Abstract:In this study, the simulation of an electrification system and traction power system of a 25 kV AC feed railway line was performed with all its subcomponents using MATLAB/Simulink. The power flow theory was used while modeling the railway electrification system. The transformer substation, catenary, rail, and vehicle were modeled together with the operational data. This model is used in order to determine the number of transformers, the distance of feeding centers, and the frequency of trips. The optimum design of electrification projects depends on these criteria.A dynamic structure was created with a new algorithm developed for vehicle load characteristics. The simulation of the electrification system and traction power system is performed before the analysis stage, together with the vehicle and other design parameters. This analysis is performed for the best performance of the systems. In this study, the power simulation of the railway was conducted for three different operation scenarios using MATLAB/Simulink.

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Implementation method of loss observer to power controller for overhead line and supercapacitor hybrid electric railway vehicle

Saito

Kondo

2016

IEEJ Transactions Elec Engng

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In order to absorb the regenerative power and to reduce the peak input power of a train-in other words, to smooth the input power of the train-in this paper we repot a frequency-domain-based power controlling strategy for energy storage of hybrid electric railway vehicles. Applying a loss-compensating method by using a disturbance observer improves the energy while keeping ability of this controller. However, that loss compensating method requires precise voltage-energy characteristics of the supercapacitor (SC) to estimate the correct loss. Hence, nonlinearity of the capacitance of the SC becomes a problem because it causes an error in the estimated loss. Therefore, this paper presents a method to measure the voltage-energy characteristics precisely of the SC that has a voltage dependence on the capacitance. A method to implement those characteristics into controllers is also proposed. The loss compensating method is applied to a controller by using the proposed method, and its effectiveness is verified by a small-scale experimental system.

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High-voltage DC-feeder solution for electric railways

Cited by 26 publications

References 17 publications

OPF for an HVDC feeder solution for railway power supply systems

OPF for an HVDC feeder solution for railway power supply systems

Creation of a dynamic model of the electrification and traction power system of a 25 kV AC feed railway line together with analysis of different operation scenarios using MATLAB/Simulink

Implementation method of loss observer to power controller for overhead line and supercapacitor hybrid electric railway vehicle

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