A Study on the Generating Set Capacity of Pumped Storage Units in a Cascade Water-Light Storage Complementary Co-generation System

The Chunchangba shifting-speed pumped storage demonstration power plant is the first demonstration project in China that realizes cascade water-light storage complementary co-generation through a new pumped storage power plant. To effectively solve the problem of collaborative scheduling, and control problems of the small hydropower, photovoltaic power station and pumped storage units in the terraces, this paper collects and analyzes the energy storage needs of the local power grid water and light system, and initially proposes the two energy storage schemes of 5MW and 4MW. On this basis, we further compare and study four aspects: runoff regulation calculation, power balance, suppression of PV fluctuations, and construction economic indexes, select and determine the optimal solution to realize the safe, economic, and friendly operation of combined water-light storage in the demonstration area, and provide a new technical idea and application example for small and medium-sized pumped storage construction and stepwise hydropower integration transformation.