The Reliability and Economic Evaluation Approach for Various Configurations of EV Charging Stations

Abstract

Electric vehicles (EVs) become more popular as a form of transportation and companies that make useful things are focusing on building charging stations for customers. It is hard to keep charging ports reliable for EVs that are being charged in between, even though charging station companies are building stations according to the distribution system's requirements. To make the charging station of the distribution system more reliable, the 36-ported design has been proposed with the combination of uniform and non-uniform port arrangement. The configurations have been functioned with 50-350 kW distribution system. The failure rate estimation has been implemented with the standards of the MILHDBK217F book. The probability function of the ports has been evaluated in terms of failure rate and reliability as per the standards of the MILHBK-338B book. As per the failure rate of each port, the evaluation process has been introduced to find the success rate of the charging station. The failure rate of the port arrangement of the proposed 36-ported charging station has been evaluated by using the binomial distribution method. Moreover, the cost estimation process has been implemented for the proposed 36-ported charging system in terms of the failure rate and success rate of the individual port maintenance. By the consideration of individual port failure rate and reliability of the 36-ported configuration, the voltage stability of the distribution station has been evaluated. It is inferred that the lesser failure rate and maintenance cost are achieved with better reliability of port arrangement and voltage stability as well.