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Energies 2018, 11(1), 126; https://doi.org/10.3390/en11010126

A Novel Power Flow Algorithm for Traction Power Supply Systems Based on the Thévenin Equivalent

School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
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Received: 12 December 2017 / Revised: 26 December 2017 / Accepted: 31 December 2017 / Published: 4 January 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

With the rapid development of high-speed and heavy-haul railways throughout China, modern large power locomotives and electric multiple units (EMUs) have been applied in main railway lines. The high power requirements have brought about the problem of insufficient power supply capacity (PSC) of traction power supply systems (TPSSs). Thus, a convenient method of PSC assessment is meaningful and urgently needed. In this paper, a novel algorithm is proposed based on the Thévenin equivalent in order to calculate the PSC. In this algorithm, node voltage equations are converted into port characteristic equations, and the Newton-Raphson method is exploited to solve them. Based on this algorithm, the PSC of a typical high-speed railway is calculated through the repeated power flow (RPF). Subsequently, the effects of an optimized organization of train operations are analyzed. Compared to conventional algorithms, the proposed one has the advantages of fast convergence and an easy approach to multiple solutions and PV curves, which show vivid and visual information to TPSS designers and operators. A numerical analysis and case studies validate the effectiveness and feasibility of the proposed method, which can help to optimize the organization of train operations and design lines and enhance the reliability and safety of TPSSs. View Full-Text
Keywords: electric railway; power flow; power supply capacity (PSC); Thévenin equivalent; repeated power flow (RPF); traction power supply system (TPSS) electric railway; power flow; power supply capacity (PSC); Thévenin equivalent; repeated power flow (RPF); traction power supply system (TPSS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, J.; Wu, M.; Liu, Q. A Novel Power Flow Algorithm for Traction Power Supply Systems Based on the Thévenin Equivalent. Energies 2018, 11, 126.

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