Abstract
This study presents a new approach for optimally designing a secondary distribution system (SDS) considering electric vehicle (EV) charging demand and in particular the high-power fast chargers in residential dwellings. The mathematical formulations of the optimal SDS design problem, which minimises the total annual cost per customer ( TACCu ) taking into consideration the voltage and the distribution transformer (DT) aging constraints, are developed. The proposed design approach, considering different house sizes and types, are also discussed. The obtained designs are then tested and verified through an IEEE 34-test distribution system and a real distribution system. The results have shown that the proposed optimal design approach was able to accommodate the EV charging demand without any violations of voltage and a DT aging constraints.
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