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This paper extends the research regarding the determination of the feasibleoperation region under the impact of electric vehicles. Thereby, the active andreactive power flexibility potentials of EV for alternating current and directcurrent bidirectional charging are limited in first instance by regulatoryguidelines. In this paper German regulatory guidelines are applied to depicturethe current state of the art for EV charging components. Under assumption ofbidirectional charging for EV, the corresponding flexibility polygon in the PQplane is derived. The impact on the FOR is then evaluated within the Cigr\'eEuropean medium voltage benchmark system. In a first step, the flexibilitypotential of the system is determined for a load case as basis for thecomparison with different, realistic penetration levels of EV. DER areconsidered to depict additional existing power flexibilities. In a second step,the FOR and the corresponding limitations within the system are analyzed. Undervariation of the rated line current, the limiting utility constraints arepointed out. The obtained results are the basis for more detailedinvestigations regarding the potentials of bidirectional charging for anintensified system operators cooperation. The used method presents a promisingapproach to be used by the lower system operator as tool in the grid planningprocess to estimate the possible power flexibilities that can be provided to ahigher system. Continuing, the potential for ancillary services provided by EVis discussed, resulting in the derivation of future research aspects. Becausethe accumulation of EV leads to higher grid utilization, which results inquadratically increasing grid losses the closer the grid is operating to thegrid constraints, a cost curve for the EVs active power flexibility isintroduced, whereas probability zones are indicated.

Potentials of Electric Vehicles for the Provision of Active and Reactive  Power Flexibilities as Ancillary Services at Vertical Power System  Interconnections