Stationary Charging Station Design for Sustainable Urban Rail Systems: A Case Study at Zhuzhou Electric Locomotive Co., China

Li, Heng; Peng, Jun; Liu, Weirong; Huang, Zhiwu

doi:10.3390/su7010465

Cited by 30 publications

(7 citation statements)

References 25 publications

(40 reference statements)

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“…The concentration of population in urban regions creates increasing pressures on urban and regional traffic systems [3]. As a rapid and efficient form of transportation, rail transit (i.e., metro rail and light rail) played a significant role in alleviating traffic congestion and promoting sustainable development of urban traffic system [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Urban Expansion along the Guangzhou–Foshan Inter-City Rail Transit Corridor, China

et al. 2018

Sustainability

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Understanding the urban expansion process along inter-city rail transit corridors is critical to regional integration of city groups. Though numerous studies have considered the influences of rail transit on land use and urban form, most have focused on local station areas or intra-city urban structures. Few studies have examined the effects and dynamic process along inter-city rail transit corridors at a regional scale. In this study, multi-remote sensing images, landscape metrics and gradient analysis were combined to investigate the spatial and temporal dynamics of urban expansion and regional structural changes along the GuangFo inter-city Metro in the Pearl River Delta, south China. We introduced Thiessen Polygon into quadrat zoning for landscape gradient analysis, and clearly revealed the spatial variations of landscape changes along the metro transect. The regional expansion stage and inter-city structural changes were further detected based on the theoretical framework of diffusion-coalescence growth. This study revealed that during its construction the GuangFo Metro significantly impacted urban expansion at the urban fringes. Before construction the urban patches became irregular and fragmented as the gradient moved from city centers to city fringes. Influenced by the GuangFo Metro, the urban patches expanded and consequently coalesced into a homogenous urbanized area, which indicated that coalescence was the dominant expansion stage and the regional structure become more aggregated. This suggested that the inter-city rail transit has played an important role in promoting the integration of the GuangFo metropolitan region.

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Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Urban Expansion along the Guangzhou–Foshan Inter-City Rail Transit Corridor, China

et al. 2018

Sustainability

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“…More recently, a new generation of electric traction rail traffic systems has been developed . The new rail vehicle is only powered by onboard supercapacitor energy storage necessitating neither overhead wires nor third rails supplying energy, unlike existing urban rail systems.…”

Section: Introductionmentioning

confidence: 99%

Output feedback control of supercapacitors parallel charging system for EV applications: Theoretical design and experimental validation

Belhaj

Fadil

Rachid

et al. 2019

Adaptive Control & Signal

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In this paper, the problem of controlling parallel charging system with supercapacitors for electric vehicle applications is considered. When the vehicle parks at the station, the charging process of supercapacitors needs to be completed in less than 30 seconds. The control objective is then to tightly regulate the supercapacitors state of charge (SOC) to a given reference constant and to ensure an adequate current sharing between different parallel chargers. Indeed, the current sharing is a critical issue for parallel charging system with supercapacitors, which is a nonlinear system with control inputs constraints.Besides, the SOC depends on the supercapacitors internal voltage, which is not accessible for measurement. Therefore, based on a large-signal model of the parallel-chargers-supercapacitors system, an output feedback controller (combining a state observer and a nonlinear control laws) is designed. The controller is formally shown to meet all objectives, namely, closed-loop stability, SOC reference tracking, and equal current sharing. The effectiveness of the proposed output feedback controller approach is verified both by simulation and by experimental tests. KEYWORDSLyapunov stability, nonlinear control, nonlinear observer, parallel chargers, supercapacitors INTRODUCTIONDesigning onboard energy storage systems for electrical vehicles has been an intensive research activity over the last two decades. First, only batteries have been used in the storage system, before supercapacitors where introduced. Recent solutions involved both batteries and supercapacitor in the storage systems. 1,2 Presently batteries are used as energy storage devices in most applications. Such hybridization topologies can result into enhancing the battery performances by increasing its life cycle, rated capacity, reducing the energy losses, and limiting the temperature rising inside the battery. Comparing the charger circuits of batteries and supercapacitors, there are similarities and differences. Concerning similarities, the constant current/constant voltage charging method is generally preferred in both circuits for safety of the storage system. One advantage with batteries is that the range of voltage between discharged and fully charged is not very wide, so it does not pose any issue for charger circuit, while with supercapacitors, it may be needed to reach the fully discharged state, which entails a zero voltage. On the other hand, the use of battery pack necessitates the monitoring and management of the state of charge (SOC) of each individual cell of the battery. This is not an issue with supercapacitors 1374

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“…However, in order to retain their environmental advantages over other transportation modes in urban areas, significant improvements in the energy efficiency of urban rail systems have to be further achieved [3].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, much attention of the control and energy community has been paid to both the design of stationary charging stations [3], [6], [7], [8] and energy management of onboard ESSs [9], [10]. This interest can only grow in the foreseeable future, for the energy-storage urban rails have been considered a strong contender for the next generation of urban public transportation systems.…”

Section: Introductionmentioning

confidence: 99%

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An adaptive parallel charging system for energy-storage urban rails

Peng

Wang

et al. 2015

2015 American Control Conference (ACC)

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In this paper, an adaptive parallel charging system is designed for energy-storage urban rail vehicles. The main circuit of the charging system is chosen with two parallel buck converters. The state space model of the charging system is derived with averaging method. Then an adaptive model-free extremum seeking charging controller is designed. Different from existing model-based charging methods, the proposed strategy calls for no knowledge of urban rail vehicles and hence has a wider range of applications. We further show that the proposed charging method can suppress the current imbalance between two parallel buck converters efficiently. The effectiveness of the proposed charging strategy is proved with rigorous theoretical analysis. Moreover, experiment results from a prototype parallel charging system verify the theoretical analysis.

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Stationary Charging Station Design for Sustainable Urban Rail Systems: A Case Study at Zhuzhou Electric Locomotive Co., China

Cited by 30 publications

References 25 publications

Spatial and Temporal Dynamics of Urban Expansion along the Guangzhou–Foshan Inter-City Rail Transit Corridor, China

Spatial and Temporal Dynamics of Urban Expansion along the Guangzhou–Foshan Inter-City Rail Transit Corridor, China

Output feedback control of supercapacitors parallel charging system for EV applications: Theoretical design and experimental validation

An adaptive parallel charging system for energy-storage urban rails

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