Time configuration and cost-saving analysis of supplemental light in solar greenhouses under time-of-use electricity price mechanism

To address issue of high operational costs for winter supplemental light in solar greenhouses, time-of-use electricity price mechanism was utilized to propose a time configuration scheme for supplemental lighting．An edge-cloud collaborative control system was developed for environmental monitoring and control strategy integration．A 600 m² solar greenhouse was taken as study object, and a dynamic thermal environment model was established for 72 h simulation analysis of three control strategies: baseline, peak-valley priority, and compromise．Results has showed that when maintaining an indoor temperature between 12 to 28 °C and providing 4 h of supplemental light per day, peak-valley priority and compromise strategies reduced electricity cost by 37.4% and 18.6%, respectively, compared to baseline strategy．These findings provide a reference for time configuration and economical operation of supplemental light in solar greenhouses．