Planning and reliability of DC microgrid configurations for Electric Vehicle Supply Infrastructure

Infrastructures for Electric Vehicle feeding, providing smart charging, vehicle-to-grid and local generation are of increasing interest. The operation of these systems and the integration with distribution networks can gain remarkable improvement by proper DC microgrid structure, able to reduce losses in converters, to improve controllability and to enhance overall availability. In this paper, a procedure for optimal planning of a DC microgrid for Electric Vehicle Supply Infrastructure is carried out, with specific tailoring according to technical configurations for source connection, involving different converter types and topologies. The procedure is completed by a reliability analysis, where rule-based curtailment is performed with multi-state matrix approach, and the effect of expected energy not supplied on total cost is evaluated, at different integration levels of energy storage. The proposed approach is applied to a case study of envisaged demonstrator for an Electric Vehicle service fleet.