Optimized Dispatch Strategy for a Hydropower-Wind- Solar-Storage Complementary System under Extreme Drought Conditions with Shiftable Loads

With the intensification of global climate change, extreme weather conditions pose significant challenges to the stability of power systems. The multi-energy complementary system, integrating hydropower, photovoltaics, wind power, and energy storage, known as the hydro-wind-solar-storage complementary system (HWSSCS), has the potential to enhance the system's ability to accommodate fluctuations in renewable energy through the peak-shaving and frequency-regulation functions of hydropower. However, under extreme drought conditions, hydropower generation capacity is constrained, significantly increasing the complexity of system operation. In this paper, a short-term optimization scheduling model for HWSSCS, incorporating shiftable loads, is constructed to analyze scheduling strategies under drought scenarios and to investigate the impact of shiftable loads on the system's supply-demand balance. The results indicate that the integration of shiftable loads effectively alleviates power supply pressure during peak load periods, reduces load gaps and curtailment, and enhances the robustness and operational flexibility of the system.