ICCG method applied to solve DC traction load flow including earthing models

Pires, Carlos; Nabeta, Sílvio Ikuyo; Cardoso, J.R.

doi:10.1049/iet-epa:20060174

Cited by 32 publications

(29 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The return circuit is a distributed parameter model, which is always divided into segments of 100-300 m in the simulation, and the segment is equivalent to a lumped parameter model. In the simulation of the whole line, the conductance matrixes of multiple segments will be very large, and the speed of the calculation will be slow [23]. In this paper, the return circuit between the train and traction substation is simulated with a π circuit, and the parameters are modified by a distributed parameter model to ensure the accuracy and speed of the simulation [24].…”

Section: System Modelingmentioning

confidence: 99%

Maximum Safety Regenerative Power Tracking for DC Traction Power Systems

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

Direct current (DC) traction power systems are widely used in metro transport systems, with running rails usually being used as return conductors. When traction current flows through the running rails, a potential voltage known as "rail potential" is generated between the rails and ground. Currently, abnormal rises of rail potential exist in many railway lines during the operation of railway systems. Excessively high rail potentials pose a threat to human life and to devices connected to the rails. In this paper, the effect of regenerative power distribution on rail potential is analyzed. Maximum safety regenerative power tracking is proposed for the control of maximum absolute rail potential and energy consumption during the operation of DC traction power systems. The dwell time of multiple trains at each station and the trigger voltage of the regenerative energy absorbing device (READ) are optimized based on an improved particle swarm optimization (PSO) algorithm to manage the distribution of regenerative power. In this way, the maximum absolute rail potential and energy consumption of DC traction power systems can be reduced. The operation data of Guangzhou Metro Line 2 are used in the simulations, and the results show that the scheme can reduce the maximum absolute rail potential and energy consumption effectively and guarantee the safety in energy saving of DC traction power systems.

show abstract

Section: System Modelingmentioning

confidence: 99%

Maximum Safety Regenerative Power Tracking for DC Traction Power Systems

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Some of these works consider the DC system and also the AC system feeding the DC one [1], [2], [5]- [8] and others consider only the DC subsystem [4], [9]. The former provide a more accurate solution because the effect of the AC subsystem is considered, but the latter are faster, and for most applications they have enough accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…The former provide a more accurate solution because the effect of the AC subsystem is considered, but the latter are faster, and for most applications they have enough accuracy. As it is stated in [4], some of these works solve the system of equations using direct approaches based on Gaussian elimination, Cholesky decomposition or Zollenkopf bifactorisation considering that DC substations are DC voltage or current sources [? ], [4], [9] .…”

Section: Introductionmentioning

confidence: 99%

BFS Algorithm for Voltage-Constrained Meshed DC Traction Networks With Nonsmooth Voltage-Dependent Loads and Generators

Arboleya

Belaid

González-Morán

et al. 2016

IEEE Trans. Power Syst.

View full text Add to dashboard Cite

Abstract-In this paper a new procedure based on a Backward/forward sweep (BFS) algorithm for solving power flows in weakly meshed DC traction networks is presented. The proposed technique is able to consider the trains as non-linear and nonsmooth (non-differentiable) voltage dependent loads or generators. This feature permits the inclusion of the trains overcurrent protection and the squeeze control. With the use of the mentioned controls, the conventional power flow problem becomes a voltage constrained power flow problem, and the interaction between the trains and the network can be accurately modeled. However, the train control induces a highly non-smooth voltage dependent load characteristics, causing convergence problems in most of the derivative based algorithms. The proposed algorithm is faster, more robust and stable than the derivative based ones. In addition, the authors present all the formulation in a compact matrix based form by means of the graph theory application and the node incident matrix.

show abstract

“…From the literature [11][12][13][14] and also proof by simulation experiences, the current injection method or alternatively current-vector iterative method (CIM) is more efficient than any others. However, for a large-scale DC power network, several hundred nodes or up to a thousand nodes, incomplete Cholesky conjugate gradient (ICCG) method [15] to handle large sparse matrices is preferred.…”

Section: Introductionmentioning

confidence: 99%

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Kulworawanichpong

2015

J. Mod. Transport.

View full text Add to dashboard Cite

Multi-train modeling and simulation plays a vital role in railway electrification during operation and planning phase. Study of peak power demand and energy consumed by each traction substation needs to be determined to verify that electrical energy flowing in its railway power feeding system is appropriate or not. Gauss-Seidel, conventional Newton-Raphson, and current injection methods are well-known and widely accepted as a tool for electrical power network solver in DC railway power supply study. In this paper, a simplified Newton-Raphson method has been proposed. The proposed method employs a set of current-balance equations at each electrical node instead of the conventional power-balance equation used in the conventional Newton-Raphson method. This concept can remarkably reduce execution time and computing complexity for multi-train simulation. To evaluate its use, Sukhumvit line of Bangkok transit system (BTS) of Thailand with 21.6-km line length and 22 passenger stopping stations is set as a test system. The multi-train simulation integrated with the proposed power network solver is developed to simulate 1-h operation service of selected 5-min headway. From the obtained results, the proposed method is more efficient with approximately 18 % faster than the conventional Newton-Raphson method and just over 6 % faster than the current injection method.

show abstract

ICCG method applied to solve DC traction load flow including earthing models

Cited by 32 publications

References 4 publications

Maximum Safety Regenerative Power Tracking for DC Traction Power Systems

Maximum Safety Regenerative Power Tracking for DC Traction Power Systems

BFS Algorithm for Voltage-Constrained Meshed DC Traction Networks With Nonsmooth Voltage-Dependent Loads and Generators

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Contact Info

Product

Resources

About