Charging of Electric Vehicles

The research group Charging of Electric Vehicles forms the interface to the main research areas Active Distribution Grid and Electric Mobility. In the field of electromobility, solutions for the grid and system integration of electric vehicles are developed at the Institute.

Research Competencies in the Fields of

Concepts for grid and system integration of electric vehicles
Smart home and smart building applications
Carrying out measurements and analyses in the energy management laboratory elenia energy labs
Traceable power, energy and efficiency measurement of mobility applications
Metrological characterization of AC and DC charging processes
Charging profiles
Solution approaches for increasing the absorption capacity of electric vehicles in low-voltage grids
Communication between charging station and electric vehicle according to ISO 15118 and DIN SPEC 70121
Decentralised, grid-oriented charging according to the application rule VDE AR N 4100
Development and operation of an own backend system (elias2.0) for charging control
Charging management of electric vehicle fleets
Consideration of uncertainties in the application of charging management
Second life application of traction batteries

PTB

Cooperation with Working Group 2.33 Power and Energy, Testing Laboratories of PTB Braunschweig

elenia energy labs - Energy Management Laboratory
The energy management laboratory is equipped with battery storage units, PV simulators, charging stations and electronic loads. There is also a climate chamber, a heat pump and several heat and cold storage units. The energy management laboratory is used to investigate energy management concepts. With the new laboratory environment, scientific investigations can be carried out on the interaction of various decentralised generation units, electrical storage units and flexible consumers such as electric vehicles and heat pumps. The new infrastructure will already make it possible to conduct scientific research into many questions that will only arise in practice in the coming decades with higher proportions of renewable energies.

Grid Dynamics Laboratory
The grid dynamics laboratory contains, among other things, several DC sources and a grid simulator. One of the DC sources was used to create a DC charging station for grid-oriented charging. The charging control for this charging station was implemented with a charging controller, which can communicate with electric vehicles according to DIN 70121 and ISO 15118, and a Raspberry Pi. In order to investigate the effects of grid-oriented charging, the net simulator can be used to generate critical net situations such as voltage and frequency fluctuations. With regard to grid-oriented charging, the DC sources enable control of the charging power. In the future, the grid dynamics laboratory will be equipped with a bidirectional battery charger, which also enables reactive power control and a bidirectional power flow.