Extension of Standardized Tests to Validate the Behavior of DER2G on the Example of Bidirectional Charging Stations in Germany

Abstract:
Recent transformations of the electrical energy system are leading to a structural change and a more complex and decen-tralized overall system. The electrification of vehicles also results in an increase of charging systems, where especially bidirectional charging stations can play a shifting role in the dynamic system of the electrical grid. The combination of various systems and actors in the electrical energy system requires new analysis techniques to develop and validate the overall electrical energy system and its subsystems. Hardware-in-the-Loop methods offering the opportunity to combine different domains of this overall system to investigate and test the effects of the components on each other. The presented paper involves the design of a testing system for charging systems to investigate their dynamic effects in relation to the electrical grid. Therefore, a model of the electrical grid has been developed, which can reproduce various changes in the grid based on test scenarios developed from current standards in Germany and Europe (DIN EN 50160, VDE-AR-N-4100 and -4105). From this simulation, conclusions about the stability of the model could be drawn to finally build a Power Hardware-in-the-Loop laboratory system. This infrastructure is used to test and validate charging systems of electrical vehicles and can be used for other relevant com-ponents such as PV-inverters and combined heat and power plants. The first test sequences have validated the stability of the testing system and could show its possibilities.