Abstract
This paper presents the technology and testing platform for interoperable e-mobility, infrastructure and power grids at TU Dortmund University. That environment allows to emulate several power grid states and to analyse the behaviour of charging station and EV regarding to both electrical and ICT aspects. Using this technology platform we developed an alternative method for Residual Current Detection with DC components in electrical vehicle charging. Standard methods are not very well suited for these requirements, because they are very expensive and need a manual reset. The method which is presented in this paper detects the fault current by using an AC/DC summation current transformer in the electric vehicle. The fault current is announced by a fault state. A control unit in the charging station detects the fault state which is transmitted by using the control pilot. The cut-off is done by the already existing charging contactor which is included in the charging station. The fault state is transmitted by using the control pilot. The here presented protection method has a comparable security level to typically used protection devices. It allows cost savings by a factor up to 50. It can be used also for cut-off by detecting an isolation failure.
Highlights
The Test Centre for Interoperable Electro Mobility - Infrastructure and Power Grids (TIEIN) at TU Dortmund University, in cooperation with industrial partners, has the objective to build up a competence and innovation centre for electric mobility infrastructure and grids
That environment allows to emulate several power grid states and to analyse the behaviour of charging station and electric vehicle (EV) regarding to both electrical and ICT aspects. Using this technology platform we developed an alternative method for Residual Current Detection with DC components in electrical vehicle charging
The control unit is based on a dSPACE system, FPGA- and DSC Hardware flexible for all kind of power electronic hardware available on the market or new developed
Summary
The Test Centre for Interoperable Electro Mobility - Infrastructure and Power Grids (TIEIN) at TU Dortmund University, in cooperation with industrial partners, has the objective to build up a competence and innovation centre for electric mobility infrastructure and grids Core of this competence centre is a laboratory including a grid emulation test bench, a power electronic development platform, a motor test bench, a chassis dynamometer and ICT in order to emulate and test the whole chain between the grid, the electric vehicle (EV) and the required communication. A terminal block is used as main control device and allows the hardware interconnection according to requirements Both the central processing unit and the main control device are connected with the real time hardware within the testing and development environment. This real time hardware operates the requested processes to simulate the voltage curves. We show on what terms a possible fault of the charging rectifier contains a direct current component in fault current and how the charging socket can be switched off safely in that case
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