Feedforward Compensation of Railway Static Power Conditioners in a V/v Traction Power Supply System

Yaoguo Li,Zhaohui Tang,Jiaxi Hu,Fangyuan Zhou,Yongfang Xie

doi:10.3390/electronics10060656

Yaoguo Li, Zhaohui Tang + Show 3 more

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https://doi.org/10.3390/electronics10060656

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Journal: Electronics	Publication Date: Mar 11, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Central South University

Abstract

Railway static power conditioners (RPC) usually improve the power quality of traction power supply systems only according to the active power of the load, which leads to inaccurate compensation. There are two factors that restrict the performance of RPC, one of which is the reactive power of the load, and the other is the system error. In order to eliminate the compensation error, a compensation optimization method is proposed. First, calculate the reactive power compensation value for the reactive power of the load. Second, introduce the amplitudes and phases of the primary currents of the V/v transformer as references for the compensation error caused by the system loss and then use fuzzy control to optimize compensation. The compensation method proposed in this paper is actually a feedforward control. In addition, this method balances the three-phase currents and enables RPC to be used in railway power supply systems with low locomotive power factors. The effectiveness of the method proposed in this paper has been confirmed by the simulation results.

Highlights

IntroductionPower quality problems existing in the traction power supply system have been hindering the development of electrified railways
Electrified railways have been relatively mature in structure and application
Because the three-phase V/v transformer has the advantages of a simple structure, convenient installation and maintenance and easy control, it is widely used in the traction power supply systems of electrified railways

Summary

Introduction

Power quality problems existing in the traction power supply system have been hindering the development of electrified railways. Because the three-phase V/v transformer has the advantages of a simple structure, convenient installation and maintenance and easy control, it is widely used in the traction power supply systems of electrified railways. Traction power supply systems using three-phase V/v transformers, have problems including negative sequences, harmonics, and low power factor [1,2,3]. To solve these problems, researchers have proposed a variety of solutions. The solutions currently applied to traction power supply systems include the following:

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Methods

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Conclusion