Dispatching Strategy for Hydro-Thermal-Wind-Solar-Storage Complementary Systems Balancing Grid Flexibility and Economic Efficiency

In the context of renewable energy (RE) integration, traditional economic dispatch methods demonstrate significant limitations in addressing operational risks arising from the uncertain nature of RE. This paper proposes a dispatching strategy for hydro-thermal-wind-solar-storage complementary systems (HTWSS-CS) that balances grid flexibility and economic efficiency. Firstly, drawing from flexibility supply-demand dynamics, system flexibility metrics are established. Then, using these metrics as a foundation, a comprehensive dispatch model for HTWSS-CS is constructed to simultaneously optimize grid flexibility and economic efficiency. Verification results using an improved IEEE 39-bus system validate that the approach proposed in this paper yields marked enhancements in grid flexibility while maintaining a moderate cost escalation, effectively balancing economic efficiency and flexible regulation performance.