시간대별 차등 전기요금을 고려한 최소비용 장비운용계획

Abstract

As power consumption increases, more power utilities are required to satisfy the demand and consequently results in tremendouscost to build the utilities. Another issue in construction of power utilities to meet the peak demand is an inefficiency causedby surplus power during non-peak time. Therefore, most power company considers power demand management with time-basedelectricity rate policy which applies different rate over time. This paper considers an optimal machine operation problem underthe time-based electricity rates. In TOC (Theory of Constraints), the production capacities of all machines are limited to oneof the bottleneck machine to minimize the WIP (work in process). In the situation, other machines except the bottleneck areable to stop their operations without any throughput loss of the whole manufacturing line for saving power utility cost. To considerthis problem three integer programming models are introduced. The three models include (1) line shutdown, (2) block shutdown,and (3) individual machine shutdown. We demonstrate the effectiveness of the proposed IP models through diverse experiments,by comparing with a TOC-based machine operation planning considered as a current model.