Abstract
This paper considers two isolated solutions for fast charging of electric vehicles (EVs). The isolation is located on the grid side (off board), whereas the rest of the charging apparatus is placed on board the EV, and it entirely consists of the existing power electronics components that would be otherwise used only for propulsion. Thus, substantial savings on space, weight, and cost are achieved. The considered configurations fully incorporate either a symmetrical or an asymmetrical six-phase machine, as well as a six-phase inverter, into the charging process. Due to the nature of the connections, torque production is avoided during the charging/vehicle-to-grid (V2G) modes of operation. Thus, the machines do not have to be mechanically locked, and their rotors naturally stay at standstill. Control schemes for both configurations are elaborated, and theoretical results are validated by experiments for the two configurations in both charging and V2G modes.
Highlights
INTRODUCTIONO NE of the main challenges in the electric vehicle (EV) sector is to decrease the charging time of on-board battery chargers
O NE of the main challenges in the electric vehicle (EV) sector is to decrease the charging time of on-board battery chargers. This can be achieved by placing a high-power standalone charger on board the vehicle, this solution is not viable due to the unacceptable increase in vehicle weight and cost
The phase transposition principle was employed in order to avoid torque production in the machines
Summary
O NE of the main challenges in the electric vehicle (EV) sector is to decrease the charging time of on-board battery chargers. These currents can significantly exceed the permitted limit that is set due to safety concerns if a proper mitigating technique is not employed (one of these may be the integration of a filter capacitor between the protection earth conductor and the neutral conductor [4]) Another important aspect of integrated battery chargers is whether a torque gets produced during the charging process. It is relatively easy to avoid torque production in the machine if the charging is from a single-phase grid, and this is why a majority of existing integrated charging solutions are viable only for single-phase charging [5]–[11].
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