Research on uninterrupted power supply technology for auxiliary winding of electric locomotive when passing neutral section

Du, Yuliang; Zheng, Trillion Q.; Wang, Ran; Hao, Ruixiang; You, Xiaojie; Liu, Youmei

doi:10.1109/apec.2015.7104792

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…So this scheme is also attractive for upgrading practical locomotives with the auxiliary systems powered by auxiliary windings of traction transformers. The validity of the proposed scheme is verified by simulation and experimental results and on-site operation of an upgraded electric locomotive (Yuliang et al. , 2015).…”

Section: Introductionmentioning

confidence: 87%

“…So in the proposed scheme, the primary current must be controlled to an appropriate value related to the feature of main breaker, which is a vacuum circuit breaker type before the main breaker disconnecting. Specially, a less current is not easy to hold the voltaic arc of the main breaker when it cut off and the cut-off current always results in a overvoltage and therefore, the smaller current is not the better (Yuliang et al, 2015). Figure 5(a) shows the power flow before primary current controlled and both traction system and auxiliary system exchange power with catenary as blue lines show.…”

Section: Stage1: Process Of Main Breaker Offmentioning

confidence: 99%

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

2024

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PurposeAuxiliary 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/approachUninterrupted 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.FindingsThis 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/valueThe 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.

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Section: Introductionmentioning

confidence: 87%

Section: Stage1: Process Of Main Breaker Offmentioning

confidence: 99%

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

2024

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“…In order to ensure the reliability and flexibility of power supply, the electrified railway traction power supply system generally adopts partition power supply [1,2]. There is no power zone between different power supply arms.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Sympathetic Inrush in Traction Network Cascaded Transformers Based on Flux-Current Circuit Model

Jia

et al. 2019

Energies

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When electric multiple units (EMU) pass the neutral zone, the traction transformer may generate sympathetic inrush, which will cause a malfunction in the transformer differential protection. In order to study the mechanism of the sympathetic inrush of the cascaded traction transformer, the flux–current model of the transformer, line impedance, power system voltage source, and other loads was established. On the basis of the flux–current circuit model, the influence of different factors on the sympathetic inrush of the traction transformer was analyzed. The analysis results were verified by simulation. Research results show that the remanence, closing angle, line impedance, and load will affect the duration and amplitude of the sympathetic inrush.

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“…However, the system needs to shut down and restart again without grid reference or some critical issues. An uninterrupted power supply (UPS) has to pick up the critical loads for a short time interval [89]. The re-energizing of the microgrid is an important task.…”

Section: Black Start Strategy For a Typical Ac/dc Hybrid Microgridmentioning

confidence: 99%

Modeling and coordination control of AC/DC hybrid microgrids

Zhang¹

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Three-phase alternating current (AC) has dominated the global power systems for over a century due to advantages such as readily transforming voltages with different levels, high-efficiency generation, transmitting power over long distances, etc. However, direct current (DC) power systems have recently gained popularity because they enable the more efficient and dependable integration of renewable energy sources such as solar, wind, fuel cells, and battery energy storage systems (ESSs). Thus, interlinking AC and DC subgrid power systems to be hybrid AC/DC microgrids presents a promising solution to energy and environmental issues.Due to the intermittence characteristic of renewable energy resources, energy storage (ES) is important to help mitigate the power imbalance between generation and consumption in AC/DC microgrids and to maintain the AC grid frequency and DC bus voltage. The improvement in power conversion efficiency and the reduction of carbon emissions into the environment are the major benefits of AC/DC hybrid microgrids. To achieve comprehensive coordination for hybrid microgrids, the most common implementation for the entire system is a centralized energy management system (EMS) with a communication link between the central controller and other system components. The primary drawbacks of centralized control are relatively low system reliability due to the need for a communications network and relatively slow response time due to the communication delay. Therefore, proper coordination controls of AC/DC microgrids need to be implemented to ensure stable, reliable, and efficient system operation and supply the load with high power quality. The modeling for different typologies, such as bipolar DC networks and nine-switch-based configurations of hybrid microgrids, investigates i Abstract the effectiveness of the associated decentralized and coordination control power management schemes. The objective is to minimize the power system frequency deviation of the AC subgrid and the voltage deviation of the DC subgrid caused by load changes and renewable power fluctuations. Advanced coordination control, VRM Voltage Regulation Mode VSC Voltage Source Converter VSM Virtual Synchronous Machine xii voltage regulation was complex, inefficient, and costly compared to AC voltage regulation using transformers. Therefore, AC appeared to be the better option,and it has become the norm for energy transmission and distribution ever since.According to [12], the implementation of DC systems can be traced back more than a decade ago. However, its popularity did not increase much until the last decade, when renewable energy developed dramatically. The expansion of popular renewables such as PV and energy storage (ES) including super-capacitors and batteries, which are all compatible with DC, has accelerated the popularity of DC power networks [13], [14]. Almost all electrical appliances are connected to an AC power supply in the existing power network. Specialized AC/DC rectifiers must convert utility AC power to DC power. H...

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Research on uninterrupted power supply technology for auxiliary winding of electric locomotive when passing neutral section

Cited by 7 publications

References 3 publications

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

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

Mechanism Analysis of Sympathetic Inrush in Traction Network Cascaded Transformers Based on Flux-Current Circuit Model

Modeling and coordination control of AC/DC hybrid microgrids

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