Solar Energy Demand-to-Supply Management by the On-Demand Cumulative-Control Method: Case of a Childcare Facility in Tokyo

Abstract

In recent years, environmental and energy issues relating to global warming have become more serious, and there is a need to shift from conventional power generation, which emits an abundance of carbon dioxide, to renewable energy sources without emissions, such as solar and wind. However, solar power generation, which is one of the renewable energies, changes dynamically, depending on real time weather conditions. Thus, power supplied mainly by solar power generation is often unstable, and an appropriate on-demand energy management for demand-to-supply is required to ensure a stable power supply. Demand-to-supply management methods include inventory management analysis and on-demand inventory management analysis. The cumulative-control method has been used as one of the production management methods to visually manage inventory status in factories and warehouses, while the on-demand cumulative-control method is an extension of inventory management analysis. This study models a demand-to-supply management method for a solar power generation system by using the on-demand cumulative-control method in an actual case. First, a demand-to-supply management method is modeled by an on-demand cumulative-control method, using actual power data from a childcare facility in Tokyo. Next, the on-demand cumulative-control method is adopted to the case without batteries, and the amount of electricity to be purchased is estimated. Finally, the effectiveness of the maximum battery capacity and the amount of the initial charge are examined and discussed by sensitivity analysis.

Seasonal Analysis and Capacity Planning of Solar Energy Demand-to-Supply Management: Case Study of a Logistics Distribution Center

“…The on-demand cumulative control method (Ijuin et al, 2022) [20] is a demand-tosupply method based on the inventory control method proposed by Matsui et al (2005) [21]. It enables the adjustment of base supply in response to changes in the demand structure and the on-demand alterations in subsequent input inventory management.…”

“…Notations used in this paper are listed in Table 3. The procedure and formulation for applying the on-demand cumulative control method [20] are depicted in Figure 3. The procedure for the proposed method in this study contains the solar power generation estimation step which shows step (a) in addition to the procedures (b) to (g) for applying the on-demand cumulative control method in Ijuin et al (2022) [20].…”

“…A model that treats the relationship among supply, inventory, and demand in the case of solar energy is required to conduct solar energy demand-to-supply management. Figure 2 shows the demand-to-supply management model (Ijuin et al, 2022) [20] for solar energy based on the relationship among the supply, demand, and inventory. Private power generation in period t, S t , and power purchase amount P t represent the supply of electricity.…”

“…However, they did not conduct an analysis that considered the seasonal characteristics of renewable energy. Ijuin et al (2022) [20] applied an on-demand cumulative control method (Matsui et al, 2005) [21] to actual solar energy production and consumption data in a childcare facility. On-demand cumulative control is a demand-to-supply management method that enables adjusting the base supply in response to changes in the demand structure and on-demand alterations in the input at the next period in inventory management.…”

Special Issue “Energy Transition and Environmental Sustainability”

“…In 'Solar Energy Demand-to-Supply Management by the On-Demand Cumulative-Control Method: Case of a Childcare Facility in Tokyo', the authors Hiromasa Ijuin, Satoshi Yamada, Tetsuo Yamada, Masato Takanokura and Masayuki Matsui [12] used actual power data from a childcare facility in Tokyo and used a demand-to-supply management method for a solar power generation system by using the on-demand cumulative-control method.…”