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Internal structure of the energy storage power supply for a trolley case

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If the voltage of the energy storage system always stays below the trolley voltage, a buck-boost DC chopper as given in Figure 3 is most suitable. Figure 3: Topology of a Buck-Boost DC-Chopper. In Trolley Mode, the

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Internal structure of the energy storage power supply for a trolley case [PDF]

6 FAQs about [Internal structure of the energy storage power supply for a trolley case]

Why is installation of energy storage system easier in new trolleybuses?

Installation of energy storage system is easier into new trolleybuses in terms of technical challenges, because the proportion of the energy storage system can be already considered at trolleybus design and manufacture.

What is the voltage of the energy storage tank?

If a battery will be used then the voltage will be approx. 600 V (constant). In the discharging process the energy storage tank will be dimensioned for the maximum power delivered normally from the trolley found out in the measurement.

How much energy does a trolleybus use?

In the study and in other documents concerning the TROLLEY project, information about average energy consumption of 2.5 kWh/km can be found. Note: Our study comes to the number of 1.3 kWh/km. This result was obtained from a measurement on a smaller and lighter trolleybus 21 Tr, see Chap. 4.2.4, equation (4.8).

How much energy does a trolley battery use?

As can be seen from Tab. 2.1, the battery is dimensioned for high energy – apparently for the purpose of long independent driving without the need for a trolley supply. In the study and in other documents concerning the TROLLEY project, information about average energy consumption of 2.5 kWh/km can be found.

Should braking energy be stored in a trolley or ultracapacitor?

It is clearly more favorable to return the braking energy into trolley than into energy storage tank (ultracapacitor, LiFePO4 battery) in economic point of view. Most of the braking energy is consumed by another vehicles connected into the same trolley section in macroscopic point of view.

How much energy is wasted in a trolley?

Since the total energy wasted in the trolley is only 157.5 kWh a similar result as in 1) is obtained – namely 23.1 %. The energy loss in the trolley represents only ca. 2.5 % of the energy delivered from this trolley to the trolleybuses.

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