In an electric vehicle it is important to minimize the losses to utilize most of the expensive battery. It is also important to keep the weight of the vehicle down to reduce cost and fuel consumption. One way of achieving this is to combine the charger and the propulsion converter into one unit since they consist of the same components and are only used one at a time. This will reduce the cost and the weight of the vehicle.
The aim of the project is to analyse the possibility to use a multilevel converter in electric vehicles. The converter should be able to act as the propulsion converter as well as a charger and have a high efficiency. Using a multilevel converter gives the possibility to divide the battery into modules and during driving and charging choose from which battery group the energy should be taken from. It also gives the possibility to combine different types of energy storage components like super capacitors and energy dense battery cells.
A simulation platform is under development where different setups can be simulated with different drive cycles and control strategies. A laboratory down-scaled setup of the system will be constructed for parameter determination and for verification of the models describing the system.