Bilateral power supply of the traction network as a first stage of Smart Grid technology implementation in electric traction

The transport sector has been increasing rather than decreasing its CO2 emissions, and its sustainable electrification faces a number of technical and non-technical challenges. This paper investigates these challenges, namely those of the grid load demand modelling, renewables integration, the present infrastructure limitations, and the policy/non-technical challenges. In synthesis, the suggested vision for the future sustainable urban bus network is presented as a catenary grid running In-Motion-Charging trolleybuses, with integrated PV, EV chargers, and stationary storage systems. The future grid must involve external players such as the DSO/TSO and research/academic institutions, with a dedicated coordination body, from pre-tendering all the way to daily operations.

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“…Only mentioned in works such as [53,62,63] If ignored, errors up to 25% in the substation power calculations…”

Section: Bilateral Connectionsmentioning

confidence: 99%

“…Typically assumed at a rounded-up nominal value of 650 or 700V such as in [23,62,64] Particularly important for bilaterally connected substations because of the effect on the load-sharing ratio between them…”

Section: Substation Nominal Voltagementioning

confidence: 99%

A Review of the Key Technical and Non-Technical Challenges for Sustainable Transportation Electrification: A Case for Urban Catenary Buses

Diab

Mouli

Bauer

2022

2022 IEEE 20th International Power Electronics and Motion Control Conference (PEMC)

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A Complete DC Trolleybus Grid Model With Bilateral Connections, Feeder Cables, and Bus Auxiliaries

Diab

Saffirio

Mouli

et al. 2022

IEEE Trans. Intell. Transport. Syst.

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This paper offers a complete and verified model of DC trolleybus grids and examines the effect of the common modelling assumptions made in literature by using simulations, as well as bus and substation measurements from the grid of Arnhem, the Netherlands. An equivalent model for the overhead line impedance is offered taking into account the single line impedance, the supply and return lines, and the parallel connections between them. A case study shows that the feeder cables from the substations to the sections can be ignored, but only for certain substation power and feeder-line length ranges. On the other hand, the often-neglected regenerative braking, bus auxiliaries load, bilateral connections, and the exact nominal substation voltage are found to be crucial for the correct modelling of a trolleybus grid.

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Compensation of Voltage Drops in Trolleybus Supply System Using Battery-Based Buffer Station

2022

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This paper analyzes the results of a trial operation of a battery-based buffer station supporting a selected section of trolleybus power supply systems in Pilsen, Czech Republic. The buffer station aims to prevent the catenary from excessive voltage drops in a part of the route that is most remote from the traction substation. Compensation of voltage drops is carried out by continuously measuring the catenary voltage and injecting the current into the catenary if the voltage decreases below a preset value. The effectiveness of such a solution was evaluated by the analysis of numerous experimental recordings, both from the buffer station itself and from trolleybuses in operation. Further on, based on the recordings, a utilized battery capacity was estimated and a control method for decreasing the required capacity was proposed. The optimal capacity analysis, supplemented with an evaluation of required output current rating, was used to define the best storage technology for the considered application.

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Bilateral power supply of the traction network as a first stage of Smart Grid technology implementation in electric traction

Cited by 3 publications

References 7 publications

A Review of the Key Technical and Non-Technical Challenges for Sustainable Transportation Electrification: A Case for Urban Catenary Buses

A Review of the Key Technical and Non-Technical Challenges for Sustainable Transportation Electrification: A Case for Urban Catenary Buses

A Complete DC Trolleybus Grid Model With Bilateral Connections, Feeder Cables, and Bus Auxiliaries

Compensation of Voltage Drops in Trolleybus Supply System Using Battery-Based Buffer Station

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