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The growing deployment of electric mobility calls for power system analysesto investigate to what extent the simultaneous charging of electric vehiclesleads to degraded network operation and to validate the efficiency ofcountermeasures. To reduce complexity and CPU time, a common approach whileperforming these analyses consists in replacing electric vehicles and theircharging stations with constant PQ loads. However, this approach is inaccurate,as the power absorbed by these elements actually depends not only on voltagebut also on the state of charge, charging method, cathode chemistry of thebattery pack, and converter controls in the electric vehicle and chargingstation. By considering all these aspects, this article develops a novel staticload model and a vector fitting-based dynamic load model for electric vehiclesconnected to fast charging stations. These computationally efficientrepresentations can replace the standard constant PQ load model of electricvehicles to assess more accurately their impact in static and dynamic gridstudies. Simulation results of the IEEE14 system modified by adding fleets ofelectric vehicles prove the accuracy of the proposed models and highlight theshortcomings of the standard electric vehicle representation as a constant PQload in some cases.

Definition of Static and Dynamic Load Models for Grid Studies of Electric Vehicles Connected to Fast Charging Stations