Abstract: Because of the unreasonable configuration of the electric bus charging facilities, research has been conducted to investigate the electric bus lines, charging facilities, and strategic planning methods. Further, a social welfare maximization model has been established by considering the charging waiting time and capacity as constraints based on the interaction between the charging station and the charging pile configuration as well as the design parameters of the bus line operation characteristics. The effect of waiting time on the queued charging time of the vehicle in the charging station is discussed in two different charging strategies. Further, the Lagrangian function algorithm and genetic algorithm are used for solving the model. The model and the algorithm are verified by considering the No. 931 pure electric bus line in Suzhou as an example. The results denote that the algorithm based on the Lagrangian function is more efficient than the genetic algorithm and that its result is more stable when compared with that of the genetic algorithm. Using a design based on the constructed model, the number of charging piles and the operating characteristic parameters of the bus line can achieve considerable social welfare for satisfying the charging waiting time constraint. The model proposed in this study can provide a decisionmaking basis for planning the electric bus routes.

Key words: public transportation planning, electric bus, charging facility, bus line design, social welfare