A Novel Harmonic Suppression Traction Transformer with Integrated Filtering Inductors for Railway Systems

Yuxing Liu, Jiazhu Xu, Zhikang Shuai, Yong Li, Yanjian Peng, Chonggan Liang, Guiping Cui, Sijia Hu, Mingmin Zhang and Bin Xie
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Yuxing Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Jiazhu Xu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhikang Shuai: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yong Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yanjian Peng: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Chonggan Liang: Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Guiping Cui: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Sijia Hu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Mingmin Zhang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Bin Xie: School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Energies, 2020, vol. 13, issue 2, 1-18

Abstract: This study analyzes and evaluates the feasibility of a harmonic suppression traction transformer (HSTT) for harmonic reduction in railway systems. This new type of transformer can improve the power quality of railway systems by preventing high-frequency harmonic currents from injecting into the traction grid. As the physical size of available space in high-speed trains is strictly limited, low space-occupying filtering techniques are needed. Therefore, an HSTT with integrated filtering inductors (IFIs) capable of being implemented in regular trains is proposed. Taking advantage of the HSTT, a specially constructed inductive-capacitive-inductive (LCL)-type filter is used for harmonic suppression instead of a regular LCL-type filter. The proposed filter is composed of an integrated inductor, leakage inductor of the traction transformer, and an external filter capacitor. In this paper, we analyze the topology of the proposed system, construct a mathematical model to reveal the magnetic decoupling theory of IFIs, and discuss the design and calculation procedures of the HSTT with IFIs. The field circuit coupling simulation of the HSTT with IFIs is performed to validate the effectiveness of the proposed system. Finally, the practical operation based on a 10 kVA prototype shows that the proposed scheme can not only suppress the high-order frequency harmonics but also decrease the installed space of filter devices.

Keywords: magnetic integration method; LCL-type filter; harmonic suppression; traction drive system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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