Tram west wind energy storage power station

What power system does a tram use?

The tram with an FC hybrid power system uses FCs as the main power source, and the lithium battery or supercapacitor (SC) as the auxiliary energy to supply the power shortage and recover the braking energy.

Where is tram braking energy stored?

The tram braking energy is to be stored in WESD which in turn will be feeding the charging point. The charging points are to be installed in car parks in the close vicinity of tram stations to encourage people to use the public transport. Figure 14. Feeding arrangement with charging point and WESD.

Why should you use flywheel storage in a tram?

Flywheel storage has proven to be useful in trams. During braking (such as when arriving at a station), high energy peaks are found which can not be always fed back into the power grid due to the potential danger of overloading the system.

How much power does a tramway need?

Figure 15 shows the demand power curve of the tram in actual operating condition 1. It consists of several symmetrical round-trip paths and lasts 705 s. The required maximum power is about 750 kW, and the minimum is about 380 kW. The experimental results of the proposed EMS are shown in Figs. 16 – 22. Operating condition of tramway for case 1

Why do we need stationary energy storage systems?

Since a shared electric grid is suffering from power superimposition when several trams charge at the same time, we propose to install stationary energy storage systems (SESSs) for power supply network to downsize charging equipment and reduce operational cost of the electric grid.

How can a hybrid tramway meet the power demand?

At this time, because the discharge and charging current of the SC are affected by the bidirectional DC/DC, part of the braking recovery power is consumed by the braking resistor; therefore, all three methods can meet the power demand of the hybrid tramway.