Size optimization of the PV-wind complementary pumping station system considering water supply and power reduction

Determining the optimal energy mix and system size is a critical technological challenge in the design of photovoltaic (PV)-wind hybrid energy pumping station systems around the world. This study proposed a framework for optimizing the PV-wind pumping station system size while considering water supply and power reduction. Firstly, the composition and operation principle of the PV-wind pumping station system were presented. Then, a dual-objective model was proposed to optimize the PV-wind capacity proportion. A size optimization model was established to maximize pumping flow and minimize power reduction rate. Finally, the proposed method was tested using the China Lijiazhuang pumping station. The results displayed that the optimal capacity proportion of PV and wind was 0.324 and 0.676, respectively. Additionally, as the PV/wind size increases, the annual average pumping flow gradually increases, while the annual new energy power reduction rate initially decreases and then increases. The primary causes of electricity loss are PV/wind output falling below the pumping station’s minimum power requirement and PV/wind output exceeding the pumping station’s actual consumption capacity. Consequently, these findings offer valuable guidance for the development of global renewable energy and the implementation of new energy pumping station systems in various regions.