Within the EDDA-Bus sub-project, two charging stations for the two abovementioned recharging concepts were developed by M&P Motion Control & Power Electronics GmbH from Dresden.
There are two different approaches to the so-called »opportunity charging« outside of the bus depot. The advantage of recharging the energy storage inside of the bus depot, at terminal stations and at stations where the bus usually stops for a longer period of time is that the range can be extended considerably without any impediments to the operating procedure, provided the battery has been designed appropriately. In many cases, it will even be possible to fully emulate the operating procedure of conventional diesel buses. For this kind of recharging routine, comparatively small batteries can be used, which are quite easily integrated into the vehicles.
If energy is supplied to the vehicle at underway bus stops in addition to recharging in the depot and at terminal stations, batteries with an even smaller energy content can be used. Thus, the time needed for recharging at the terminal stations will be shorter, reducing the overall risk of accumulated delays.
In order to recharge enough energy in the respective available amount of time, charging stations with different charging capacities are needed. Recharging during the passenger exchange at underway bus stops, for example, is only practical if a charging capacity of 400 - 500 kW can be realized.
|Fast charging station
|Input AC grid:||10 / 20 KV, 400 VAC|
|Alternative input DC grid:||675 - 1000 VDC|
||0 - 750 VDC|
||max. 250 kW|
|Pulse charging station
||400 VAC, 63 A|
|Connecting power:||44 kVA|
|Internal storage:||2,6 kWh (4,0 kWh optional)|
|Internal storage type:||Supercapacitors|
||0 - 750 VDC|
||max. 600 kW (optional max. 700 kW)|