Review on Optimal Scheduling of Cascade Hydro-Wind-Solar-Pumped Storage Complementary System for the New Power System

Under the background of “carbon peaking and carbon neutrality”, the proportion of renewable energy such as wind and solar power generation is increasing year by year. This trend poses significant challenges to the stable operation of the power system, mainly due to the extensive integration of wind and solar power, which introduces significant randomness and unpredictability into the grid. Cascade hydropower and pumped storage possess excellent regulating capability and can be integrated with wind and solar power plants to create large-scale clean energy complementary systems for joint optimal scheduling, thereby achieving full utilization of wind and solar energy. This paper takes the Yalong River base in China as an example to introduce the key technical issues concerning the optimal operation of large-scale cascade hydro-wind-solar-pumped storage bases. Subsequently, the current research on corresponding key issues is comprehensively reviewed and analyzed. Finally, based on the development of frontier technologies and the shortcomings of existing research, future research directions for the optimal scheduling of complementary systems are prospected, aiming to provide theoretical support for the coordinated optimization of large-scale complementary systems and the efficient consumption of clean energy.