The development of electric vehicles(EVs)brings a lot of new problems from the point of view of the electrical grid.Electric vehicles(EV)charging causes an impact load on the distribution grid,which is often nonsymmetrical,and can reach high levels in relevant parts of the grid.This leads to the deterioration of electrical energy parameters,mainly voltage level and its symmetry.The inverters operation in electric vehicle charging stations(EVCSs)generates harmonics,which also leads to the deterioration of voltage quality.In the case of simultaneous charging of a large number of EVs from a poorly designed distribution grid,significant losses inside conductors occur and the service life of the distribution grid is shortened.In order to find out feedback influences of the EVCSs on the electrical grid when EV charging,it is desirable to simulate these states on a suitable software before installing EVCSs to the grid.This may eliminate problems with the voltage quality during the actual charging.
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