01697660

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In this work, the authors propose a bi-objective optimization problem formulation for integrated dynamic wireless charging facility (DWCF) location and on-board battery size design of electric bus systems. Objectives are to minimize DWCF deployment cost and reduce energy consumption of electrified systems by selecting the optimal battery size for electric buses. As larger on-board battery size leads to higher energy consumption during bus operation but requires lower density of DWCF deployment and vice versa, the two objectives contradict each other. As energy consumption is also a major part of daily operations of an electric bus system, this formulation is also a trade-off between short-term facility deployment cost and long-term operational cost. A weighted sum method was applied to solve the proposed bi-objective integer programming problem. The results of the case study of four routes of the Greater Attleboro Taunton Regional Transit Authority (GATRA) in Massachusetts verified that the proposed problem formulation and weighted sum method could solve this problem efficiently and provide decision-makers with various options regarding DWCF design and battery size choice. An additional criterion for comparison between the solutions on the Pareto frontier taking the surplus of battery energy level compared to the lower bound of energy level limit was taken into consideration. One solution result of the bi-objective optimization method (selected according to the battery energy level surplus criteria) was compared with the solution of a single objective model in the literature from both energy-consumption and life-cycle cost perspectives to provide more managerial insights for decision-makers and researchers.

This paper was sponsored by TRB committee AP050 Standing Committee on Bus Transit Systems. Alternate title: Bi-Objective Optimization of Integrated Design of Dynamic Wireless Charging Facility and On-Board Battery Size for Electric Bus Systems

19-02827

English

7p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; References; Tables

Case studies; Costs; Electric batteries; Electric buses; Electric vehicle charging; Energy consumption; Integer programming; Life cycle costing; Location; Optimization; Size; Transit buses; Wireless communication systems

Greater Attleboro Taunton Regional Transit Authority (GATRA)

Attleboro (Massachusetts)

Energy; Finance; Highways; Planning and Forecasting; Public Transportation; Terminals and Facilities; Vehicles and Equipment

Transportation Research Board Annual Meeting 2019 Paper #19-02827

TRIS, TRB, ATRI

Dec 7 2018 9:33AM