The charging power of a single charging pile is 350 kW. The installation and purchase cost of a single charging pile is $34,948.2. The service life of PV, ESS, charging pile, transformer, and other equipment is 15 years. The land cost of charging piles for 15 years is 524.2 $/m 2. The charging pile of a single electric bus covers an area of 40 m 2.
The number of charging piles is decided based on the number of electric bus charging at the same time. ESS capacity and maximum exchange power are decided according to the maximum amount of ESS energy and exchange power in a day. These three parts compose the planning scheme of the electric bus system.
The service life of PV, ESS, charging pile, transformer, and other equipment is 15 years. The land cost of charging piles for 15 years is 524.2 $/m 2. The charging pile of a single electric bus covers an area of 40 m 2. As the output of PV is related to conditions such as illumination, the output of PV will be different in a year.
The price of electricity delivered by the grid to the charging station is divided into two periods. From 8:00 to 22:00, the price is 0.1 $/kWh. Between 22:00 and 8:00, the price is 0.04 $/kWh. The price of electricity from a charging station to the grid is the price of electricity from renewable energy sources to the grid.
Second, the development of energy storage technology promoted the fast charging mode of electric vehicles [ 4, 5 ], which significantly reduces the unit mile electricity consumption cost and standby buses [ 6, 7 ].
The charge–discharge power of ESS cannot exceed its maximum charge–discharge power limits. The maximum charge–discharge power is related to the capacity and maximum charge–discharge ratio of ESS, as shown in ( 11 )– ( 13 ). Literature [ 25] shows that non-linear constraints ( 11 )– ( 13) can be linearised, as shown in ( 14) and ( 15 ).
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