Annual Time-Series Production Simulation Model with Multiregional Interconnections Based on Optimized Cycle Decomposition

Medium/long-term time-series production simulation is critical for power balance analysis in high-renewable power systems. This study proposes a yearly 8760-hour simulation model for multi-regional interconnected systems, integrating operational models for conventional thermal, hydropower, pumped/electrochemical storage, wind, and photovoltaic units at the equipment level. System-level constraints, including regional power balance and inter-regional transmission limits, are incorporated to enhance realism. To address computational complexity, a optimizing cycle decomposition technique is introduced, dividing the annual simulation into 52 weekly cycles for sequential optimization, ensuring computational tractability. The model is validated using planning data from a provincial system in Eastern China, achieving a total solving time of ~30 minutes. Results confirm the model's capability to track real-time operational states while balancing accuracy and efficiency. This approach provides a practical framework for power system planning and operations in large-scale renewable-integrated grids