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access icon free Analysis of static VAr compensators installed in different positions in electric railways

  • Author(s): Hui Wang 1, 2 ; Ying Liu 3 ; Kun Yan 1, 2 ; Yongsheng Fu 4 ; Chenghui Zhang 5
    • View affiliations
    • Affiliations: 1: School of Electrical Engineering, Shandong University, Jinan 250061, People's Republic of China ;
      2: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Jinan 250061, People's Republic of China ;
      3: State Grid Jibei Electric Power Co., Ltd., Langfang Power Supply Company, Langfang 065000, Hebei Province, People's Republic of China ;
      4: State Grid Smart Grid Research Institute EPRI Science & Technology Co. Ltd., Beijing 100192, People's Republic of China ;
      5: School of Control Science and Engineering, Shandong University, Jinan 250061, Shandong Province, People's Republic of China
  • Source: Volume 5, Issue 3, September 2015, p. 129 – 134
    DOI:  10.1049/iet-est.2014.0046 , Print ISSN 2042-9738, Online ISSN 2042-9746
© The Institution of Engineering and Technology
Received 12/06/2014, Accepted 29/01/2015, Revised 30/12/2014, Published 24/03/2015

With the power quality problems of electric railways becoming more and more serious, static VAr compensators (SVCs) have been widely used for power quality management. SVCs can be installed in the low-voltage side of traction substations, the high-voltage side of traction substations or the electric railway power supply side of substations. Different installation positions result in different compensation effects. In this study, characteristics of harmonic and negative sequence currents in the low-voltage and high-voltage sides of traction substations are analysed theoretically. Four schemes with SVCs in different installation positions are proposed. Then based on the measured datum and waveforms, simulation of each scheme is implemented, respectively, using PSCAD/EMTDC software. By comparing the compensation effects of the four schemes, the best SVC installation scheme in the low-voltage side of the traction substation is recommended for the measured traction substation. With SVC, the electric railway will have a less negative effect on the power grid. This study can also be applied to other SVC applications with non-linear loads, such as arc furnaces, rolling mills or electrochemical devices.

Inspec keywords: power supply quality; railway electrification; substations; static VAr compensators; traction power supplies; power grids; power system harmonics

Other keywords: traction substations; harmonic characteristics; compensation effects; electric railway power supply; low-voltage side; power grid; rolling mills; SVCs; electrochemical devices; power quality management; static VAr compensator analysis; high-voltage side; negative sequence currents; PSCAD-EMTDC software; nonlinear loads; arc furnaces

Subjects: Power supply quality and harmonics; Transportation; Power convertors and power supplies to apparatus; Other power apparatus and electric machines; Substations

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