TY  - EJOU
AU  - Zhu, Xingxu 
AU  - Wang, Shiye 
AU  - Yan, Gangui 
AU  - Li, Junhui 
AU  - Dong, Hongda 
AU  - Li, Chenggang 

TI  - Monthly Reduced Time-Period Scheduling of Thermal Generators and Energy Storage Considering Daily Minimum Chargeable Energy of Energy Storage
T2  - Energy Engineering

PY  - 2025
VL  - 122
IS  - 4
SN  - 1546-0118

AB  - To address the excessive complexity of monthly scheduling and the impact of uncertain net load on the chargeable energy of storage, a reduced time-period monthly scheduling model for thermal generators and energy storage, incorporating daily minimum chargeable energy constraints, was developed. Firstly, considering the variations in the frequency of unit start-ups and shutdowns under different levels of net load fluctuation, a method was proposed to reduce decision time periods for unit start-up and shut-down operations. This approach, based on the characteristics of net load fluctuations, minimizes the decision variables of units, thereby simplifying the monthly scheduling model. Secondly, the relationship between energy storage charging and discharging power, net load, and the total maximum/minimum output of units was analyzed. Based on this, daily minimum chargeable energy constraints were established to ensure the energy storage system meets charging requirements under extreme net load scenarios. Finally, taking into account the operational costs of thermal generators and energy storage, load loss costs, and operational constraints, the reduced time-period monthly scheduling model was constructed. Case studies demonstrate that the proposed method effectively generates economical monthly operation plans for thermal generators and energy storage, significantly reduces model solution time, and satisfies the charging requirements of energy storage under extreme net load conditions.
KW  - Monthly scheduling; thermal generators; energy storage; daily minimum chargeable energy; decision time-period reduction; unit start-up and shut-down; unit commitment; renewable energy

DO  - 10.32604/ee.2025.059956