Harmonic research of electric vehicle fast chargers

Eleetrie vehiele (EV) ehargers may lead to power quality problems which mainly contain harmonie emission and voltage deviation. The fast ehargers, as a kind of high-power power eleetronie eomponent, will eause impact to power grid than generally ehargers. This thesis is focused on the harmonies of EV fast eharging stations which have operated already. Single set/multiple sets of eleetrie vehicles as charging were measured on site. We simulated the situation of multiple ehargers as eharging simultaneously in the distribution network. The harmonie eharaeteristies and influenee of EV fast ehargers on power grid harmonie is diseussed. The testing result shows that, at present, most of the fast ehargers models cannot reflect the actual eharging harmonie eharaeteristies. Furthermore, part of the harmonie current is beyond the requirements of relevant speeifications as the normal operation of the eleetrie vehicle fast eharging station, which shall also eause larger harmonie pollution to the distribution network.