Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System

Yi Hong; Yang Li; Zhikang Shuai; Hanyu Yang

doi:10.17775/CSEEJPES.2021.05000

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Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System

Regular Papers | 更新时间：2026-10-15

- Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System
- CSEE Journal of Power and Energy Systems Vol. 10, Issue 4, Pages: 1608-1617(2024)
- 作者机构：
  
  1. College of Electrical and Information Engineering, Hunan University and the Advanced Energy Technology Center of State Grid Shanghai Energy Interconnection Research Institute Co., Ltd.,Changsha,China
  2. Advanced Energy Technology Center of State Grid Shanghai Energy Interconnection Research Institute Co., Ltd.,Shanghai,China
  3. College of Electrical Engineering and Controal Science in Nanjing Tech University,Nanjing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2021.05000
  CLC：
- Published：01 July 2024
- 稿件说明：
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Yi Hong, Yang Li, Zhikang Shuai, et al. Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System[J]. CSEE Journal of Power and Energy Systems, 2024, 10(4): 1608-1617.
DOI：

Yi Hong, Yang Li, Zhikang Shuai, et al. Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System[J]. CSEE Journal of Power and Energy Systems, 2024, 10(4): 1608-1617. DOI： 10.17775/CSEEJPES.2021.05000.

摘要

Abstract

Power electronic traction transformers (PETTs) will be increasingly applied to locomotives in the future for their small volume and light weight. However

similar to conventional trains

PETTs behave as constant power loads and may cause low-frequency oscillation (LFO) to the train-network system. To solve this issue

a mathematical model of the PETT is firstly proposed and verified based on the extended describing function (EDF) method in this paper. In the proposed model

the LLC converter is simplified to an equivalent circuit consisting of a capacitor and a resistor in parallel. It is further demonstrated that the model can apply to various LLC converters with different topologies and controls. Particularly

when the parameter differences between cells are not obvious

the PETT can be simplified to a single-phase rectifier (i.e.

conventional train) by equivalent transformation. Based on the model of PETT

the system low-frequency stability and influential factors are analyzed by using the generalized Nyquist criterion. Lastly

the correctness and accuracy of theoretical analyses are validated by off-line and hardware-in-the-loop simulation results.

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