design-standards-accessible-stations 9 ( F 2)

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Nội dung chi tiết: design-standards-accessible-stations 9 ( F 2)

design-standards-accessible-stations 9 ( F 2)

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)nd Cuslavo Ramos Untoersiitnd deios Audtv, Bogota, D.C., Columbia1. IntroductionUrban Massive Transportation Systems (UMTS), like metro, tramway, ligh

t ưain; requires die supply of electric power widi high standards of reliability. So. an important step in the development ot these transportation sys design-standards-accessible-stations 9 ( F 2)

tems is the electric power supply system planning and design.Normally, the trams of a UMTS requires a DC power supply by means of rectifier AC/DC subs

design-standards-accessible-stations 9 ( F 2)

tations, know as traction substations (TS); that are connected to the electric HV/MV distribution system ot a city. The DC system feeds catenalies of

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)he railway's lines. Typically, a 600 Vdc - 750 Vdc is used in tramways; while 1500 Vdc is used in a metro system. Some interurban-urban systems use a

3000 Vdc supply to the trains.Fig. 1 presents an electric scheme of a typical traction substation (TS) with its main components: AC breakers at MV, MV design-standards-accessible-stations 9 ( F 2)

/LV transformers, AC/DC rectifiers, DC breakers, traction DC breakers. As, it is shown, a redundant supply system is placed at each traction substatio

design-standards-accessible-stations 9 ( F 2)

n in order to improve reliability. Ill addition, some elec ti ll Schemes allow the power supply ot the catenalies connec ted to a specific traction su

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)ls way, die reliability supply is improved and allows flexibility for maintenance of IS.So, an important aspect toi the planning and design of this el

ectric ỊXHver supply is a good estimation ot power demand required by the traction system that will determine the required number, size and capacity o design-standards-accessible-stations 9 ( F 2)

i AC/DC rectifier substations. On the other hand, die design of die system requires studying impacts of die traction system on die performance of the

design-standards-accessible-stations 9 ( F 2)

distribution system and vice versa. Power quality disturbances are present in the operation ot these systems that could affect the performance ot tile

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)TS) and power supply from Distribution Companies (DisCo) or Electric Power Utilities. Firsdy, «1 section depicting the modelling and simulation of die

power demand is developed, Then, a section about die computation of180Infrastructure Design, Signalling and Security in Railwaythe placement and sizi design-standards-accessible-stations 9 ( F 2)

ng of TS for urban railway systems is presented where the modelling is based on the power demand model of tlte previous section. After that, two secti

design-standards-accessible-stations 9 ( F 2)

ons about the power quality (PQ) fanpact of EMRTS on distribution systems and grounding design are presented. Both subjects make use of the load deman

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)akerDC insulationTraction circuitbreaker_______r-T_________K-rCatenary 2 or third rail 2Fig. 1. A Typical Traction Substation (TS)2. Power demand comp

utation of electric transportation systemsThis section presents a mathematical model useful to simulate urban railway systems and to compute the insta design-standards-accessible-stations 9 ( F 2)

ntaneous power of the Electric Massive Railway Transportation Systems (EMRTS) such as a metro, light tram or tramway, by means of computing models tha

design-standards-accessible-stations 9 ( F 2)

t take into account parameters such as the grid size, acceleration, velocity variation, EMRTS braking, number of wagons, number of passengers per wago

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2) these systems in a more accurate way of a real system.This model connects the physical and dynamic variables of the traction behaviour with electrica

l characteristics to determine the power consumption. The parametric construction of the traction and braking effort curves is based on the traction t design-standards-accessible-stations 9 ( F 2)

heory already implemented in locomotives and urban rails. Generally, there are three factors that limit the traction effort versus velocity: the maxim

design-standards-accessible-stations 9 ( F 2)

um traction effort (F^ra) conditioned by the number of passengers that are in the wagons, the maximum velocity of the tram (or rail), and the maximum

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an

design-standards-accessible-stations 9 ( F 2)railway lure for each time step (1 second, for example). So, the power consumption or re-generation is computed also for each time step and knowing th

e placement of each tram in the line, the power demand for each electric TS is calculated.Power System Modelling for Urban Massive Transportation Syst design-standards-accessible-stations 9 ( F 2)

ems1812.1Power consumption model of an urban train

Part 2Modelling for Railway Infrastructure Design and Characterization7Power System Modelling for Urban Massive Transportation SystemsMario A. Rios an