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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.


调度
时间
充电桩序列 对应AGV序列 充电量/
(kW·h)
平均充电
时长/min
AGV
平均
SOC/%
各辆AGV的Ec/%
1号 2号 3号 4号
0:15 8/7/9/6/5/10/11/4/12/13/3/2/1 6/1/9/2/10/5/3/4/7/13/8/12/11 608.40 12.0 52 39 37 37 37
0:45 8/7/9/6/5/10/11/4/12/13/3/2/1 6/1/9/2/10/5/3/4/7/13/8/12/11 760.50 15.0 59 81 79 79 79
1:15 8/7/9/6/5/10/11/4/12/13/3/2/1 6/1/9/2/10/5/3/4/7/13/8/12/11 354.25 15.0 61 100 99 99 99
1:45 8/4/5/7/9/11/6/10/3/1/2/12/13 16/15/21/19/20/17/18/14/26/23/
24/22/25
694.40 13.7 66 99 97 97 97
Tab.5 Results of orderly charging scheduling parameters (00:15—01:45)
Extracts from the Article
为了验证所提方法在参数计算上的完整性,对本文方法调度结果进行分析.由于篇幅有限且所涉参数结果较多,在此分别展示00:15—01:45物流与有序充电调度结果,如表4和表5所示.
由表5可见,当日起始时刻各AGV的平均电量仅为50%,当日充电任务较重,在起始段各充电桩已满载充电.另根据有序充电指派策略,当该时段电量未达到Emax时,AGV继续充电,因此00:15—01:15 AGV充电序列不变.当AGV的SOC电量大于80%时充电功率下降,因此在01:15时刻,充电电量减少,而充电时长不变.从00:15和01:15的平均充电时长不足15 min可见,仿真考虑了AGV从起始位置到充电桩的行驶时间.由于篇幅有限,仅展示1~4号AGV的SOC值,可见00:00—01:15期间4辆AGV均处于充电状态,在01:45时刻已充满,结合表5可知1~4号AGV在01:45时刻被2号岸桥调度,处于物流状态,体现了两个模块之间的耦合效果.
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