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Joint Economic Optimization of AGV Logistics Scheduling and Orderly Charging in a Low-Carbon Automated Terminal
WANG Xuan, WANG Bao, CHEN Yanping, LIU Hong, MA Xiaohui
Journal of Shanghai Jiao Tong University    2024, 58 (9): 1370-1380.   DOI: 10.16183/j.cnki.jsjtu.2023.027
Abstract   (2058 HTML8 PDF(pc) (3702KB)(557)  

To improve the current automated guided vehicle (AGV) charging strategy at automated terminals, which is not fully coordinated with the distributed power supply, a joint optimization method of AGV logistics scheduling and orderly charging is proposed. First, the synergetic relationship between AGV logistics scheduling and charging scheduling is analyzed, and a joint optimization framework is built. Then, a method to calculate the distance traveled by AGVs while considering the segregation requirements of trucks inside and outside the terminal is proposed. Afterwards, for the AGV charging module, the judgment conditions of AGV charging status and the pile selection method are defined. Furthermore, to minimize the cost of purchasing electricity at the terminal, a joint optimization model of logistics scheduling and orderly charging is constructed by considering time-of-use tariff, distributed power feed-in tariff, power balance constraint, state of charge constraint at the termination moment, upper and lower bound constraints of decision variables, and logistics scheduling constraint. Finally, a fast solution method based on improved particle swarm optimization algorithm is proposed, of which the effectiveness and economic efficiency are verified by an actual case of a terminal.


Fig.2 Joint optimization framework of logistics scheduling and orderly charging
Extracts from the Article
物流调度和有序充电联合优化框架如图2所示,在任一调度时段内,将各辆AGV的SOC与Emin相比,生成AGV可调度集和待充电集,从可调度集内选派AGV执行物流作业;从待充电集选派AGV执行充电,并将本时段充电后的SOC与Emax相比,作为是否停止充电的判断依据.各个调度时段依次递推,最后,以整日购电费用最小为目标,考虑电量平衡约束、终止时刻的SOC约束、决策变量上下限约束和物流调度约束求解.
分布式电源就地消纳率[23]是衡量分布式电源在码头自发自用的指标.该指标反映了各调度时段内的分布式电源就地消纳情况,分别以1~8座岸桥并行作业为例,其余参数与5.2节一致,计算优化前后的就地消纳率,结果如图7所示.由图可见,采用所提有序充电方法有利于提高风光出力自发自用,随着岸桥并行作业数的增多,就地消纳率总体呈上升趋势,说明充电需求的增加有利于提升负荷的可调度空间,能够将充电负荷转移至风光出力高的时段.根据计算结果,多岸桥并行作业平均提升2.28%(增长率均值)的就地消纳率,验证所提联合优化方法的有效性和实用性.
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