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Previous Simulations showed that non-controlled Electric Vehicle (EV) charging can cause critical grid situations such as voltage sag and line overloads. Today's EV charging stations mostly support uncontrolled charging; hereby the charging process is not adapted to the grid situation which could avoid grid stress or outages. As the increasing rollout of EVs is expected in the near future, grid capacity surveillance and control systems are required. Following the function of a distributed charging system is described which is able to cope with the named grid challenges.