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Research on uninterruptable power supply technology for auxiliary winding of electric locomotive while passing the neutral section

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Railway Sciences 2024年第2期3卷 128-142页

作者： Yuliang Du Locomotive and Car Research Institute China Academy of Railway SciencesBeijingChina

Purpose–Auxiliary power system is an indispensable part of the train;the auxiliary systems of both electric locomotives and EMUs mainly are powered by one of the two ways,which are either from auxiliary windings of traction transformers or from DC-link voltage of traction converters.Powered by DC-link voltage of traction converters,the auxiliary systems were maintained of uninterruptable power supply with energy from electric braking.Meanwhile,powered by traction transformers,the auxiliary systems were always out of power while passing the neutral section of power supply grid and control system is powered by battery at this time.Design/methodology/approach–Uninterrupted power supply of auxiliary power system powered by auxiliary winding of traction transformer was studied.Failure reasons why previous solutions cannot be realized are analyzed.An uninterruptable power supply scheme for the auxiliary systems powered by auxiliary windings of traction transformers is proposed in this paper.The validity of the proposed scheme is verified by simulation and experimental results and on-site operation of an upgraded HXD3C type locomotive.This scheme is attractive for upgrading practical locomotives with the auxiliary systems powered by auxiliary windings of traction transformers.Findings–This scheme regenerates braking power supplied to auxiliary windings of traction transformers while a locomotive runs in the neutral section of the power supply grid.Control objectives of uninterrupted power supply technology are proposed,which are no overvoltage,no overcurrent and uninterrupted power supply.Originality/value–The control strategies of the scheme ensure both overvoltage free and inrush current free when a locomotive enters or leaves the neutral section.Furthermore,this scheme is cost low by employing updated control strategy of software and add both the two current sensors and two connection wires of hardware.

关键词： Electric locomotive Auxiliary system neutral section Uninterruptable power supply Overvoltage Inrush current

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Hybrid Phase-controlled Circuit Breaker with Switch System Used in the Railway Auto-passing neutral section with an Electric Load

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CSEE Journal of Power and Energy Systems 2019年第4期5卷 545-552页

作者： Shuo Wang Liyan Zhang Guanghui Yu Enyuan Dong Jiyan Zou Yu Cong Yu Tian School of Electrical Engineering Dalian University of TechnologyDalian 116024China Dalian Electric Power Supply Company Dalian 116000China

Constrained by the characteristics of neutral sec- tions (NS) and traditional vacuum circuit breakers, previous phase-controlled strategies have a long power supply dead time, it is difficult to realize a continuous power supply to the auxiliary power system. The dead time can be reduced by using the ground automatic convert method, hybrid phase-controlled technologies can in theory completely eliminate inrush currents. In this paper, a new system based on hybrid phase-controlled switches is described and termed ground-switching passing neutral section system (GPNSS). The principle for restraining inrush currents is analyzed and strategies are carried out with the dead time limited to 5 ms. The characteristics of the vacuum circuit breaker are illustrated and the closing time window of the transformer is quantified. Through the use of mechanical switches and power electronics, the auxiliary power system may be continuously pow- ered. The prototype system is implemented and experimentally tested in the laboratory.

关键词： Automatic system hybrid circuit breaker inrush current neutral section phase-controlled technology

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Multi-Function Uninterrupted Phase-Separation Passing System and its Control Method

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2332-2343页

作者： Zhou Ni Jiaxin Yuan Feiran Xiao Liwen Peng Zhaoyang Zhang Yongzhi Min the School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China the School of Electrical Engineering Naval University of EngineeringWuhan 430030China the State Grid Jinan Power Supply Company Jinan 250061China the Department of Electrical and Electronic Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

At present, sudden load changes and terminal voltage fluctuations are two primary problems in the uninterrupted phase-separation passing (UPP) system. To further enhance the reliability of the UPP system and compensate for the voltage sag at the end of the traction power supply network caused by the suddenly connection of locomotive to the power grid, a multi-function uninterrupted phase-separation passing system (MUPPS) and its control strategy are proposed. It has the advantages of linear load change and improving power supply reliability. First, the topology and working principles of a MUPPS are studied;secondly, the current variation characteristics of the bridge arm when the power is continuously supplied by MUPPS during the phase-separation passing are analyzed. Then, the characteristics of a MUPPS to provide reactive power and stabilize the terminal voltage of the traction arm are analyzed. Then, the power transmission characteristics of a MUPPS under emergency working conditions are analyzed. The control strategy for the two conditions is proposed. Finally, simulation analysis and small capacity experiments are conducted. The theoretical analysis and test confirm the correctness and effectiveness of the MUPPS.

关键词： Control strategy high-speed railway MUPPS neutral section

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